TOGGLE BLOCK SLIDING MECHANISM FOR A JAW CRUSHER

Abstract: A toggle block sliding mechanism for a jaw crusher for adjusting the position of a toggle block quickly and easily, the toggle block sliding mechanism for a toggle block supporting one end of a toggle plate which is connected at the other end thereof to a lower end portion of a swing jaw being characterized in that a toggle block comprising an upper block and a lower block which are connected to each other via an elastic body is sandwiched by upper and lower supporting members which are provided on a machine frame and that the toggle block is caused to slide by applying an external force thereto.

Description: Background of the invention Field of invention This invention relates to a toggle block sliding mechanism for a double toggle or single toggle jaw crusher. Description of prior art A jaw crusher is a typical crushing machine that can be used for the primary breaking of rocks as excavated. An example of a double toggle jaw crusher is shown in Fig. 3. Excavated rocks are scooped into a crushing cavity 52 formed between a fixed jaw 5 and a swing jaw 51, and are broken by the impelling force of the swing jaw. The swing jaw 51 is suspended from a swing jaw shaft 53 as a fulcrum, and swings with the movement of a pitman 61, moving up and down with the rotation of an eccentric shaft 6, and the toggle mechanism on either side of the pitman. In this case, a double toggle mechanism is formed by a jaw toggle plate 62 that connects the swing jaw 51 and the pitman 61, and a frame toggle plate 64 that connects the pitman 61 and a toggle block 63. A safety device as a guard against uncrushable objects, and an adjustment device to adjust the gap between the fixed jaw 5 and the swing jaw 51, thereby controlling the degree of crushing, are set on the frame toggle plate side. This gap width adjustment device slides the toggle block 63 back and forth, and by means of the frame toggle plate 64, the pitman 61, and the jaw toggle plate 62, adjusts the forward and backward position of the swing jaw 51. The sliding mechanism of a conventional toggle block 63 is shown in Figs. 4 and 5. In this case, the toggle block 63 is sandwiched, using a wedge 82, between an upper support member 8 and a lower support member 81 affixed like shelves to a machine frame 7. During normal crushing operation, the toggle block 63 remains fixed. To adjust the cavity or gap width, bolts 83 are removed and the wedge 82 is pulled out, whereupon the freed toggle block 63 is moved back or forth using a hydraulic jack 9. Once adjusted to the desired gap, the wedge 82 is re-inserted, and the bolts 83 are tightened. A single jaw crusher has neither a pitman 61 nor a jaw toggle plate 62, and the eccentric shaft 6 serves a dual function as the swing jaw shaft 53. Detailed explanation of the invention Object of this invention The object of this invention is to provide a toggle block sliding mechanism for a jaw crusher which enables the position of the toggle block to be adjusted quickly and easily. Problems to be resolved by this invention As described above, when adjusting the position of a conventional toggle block 63, the bolts 83 and the wedge 82 must be removed and re-inserted for each adjustment, which makes operation very cumbersome. Means to resolve these problems This invention provides a sliding mechanism for the toggle block of a jaw crusher, comprising a toggle block supporting one end of a toggle plate connected at the other end to the bottom end of a swing jaw; wherein the toggle block comprises an upper block and a lower block, joined by an elastic body, sandwiched between an upper support member and a lower support member that are joined to the machine frame, the toggle block being slidable back and forth with the application of an external force. Effectiveness of this invention Given the configuration and action as described above, this invention is effective because, unlike the conventional mechanism, bolts and a wedge need not be removed and then re-inserted with each adjustment, enabling the position of the toggle block to be adjusted quickly and easily. Brief explation of drawings Fig. 1 is an explanatory diagram of one embodiment of the device of this invention. Fig. 2 is a cross section diagram as viewed from a line drawn along the section line II - II of Fig. 1. Fig. 3 is an explanatory diagram of the conventional technique. Fig. 4 is an explanatory diagram of the conventional technique. Fig. 5 is an explanatory diagram of the conventional technique. Example An example of one embodiment of this invention is explained below, with reference to the diagrams of the drawings. Fig. 1 shows the sliding mechanism of a toggle block 1 which supports one end of a frame toggle plate 64 of a double toggle jaw crusher. For a single toggle jaw crusher, the toggle block 1 supports the jaw toggle plate. The toggle block 1 is a steel block, divided into an upper block 11 and a lower block 12. Grooves are carved, at identical positions, into the bottom face of the upper block 11 and the top face of the lower block 12 to accomodate elastic bodies 13, 13 that expand and compress vertically. The elastic bodies maintain the required gap between the bottom face of the upper block 11 and the top face of the lower block 12, and keep the two bodies parallel. A coil-shaped or pine needle-shaped spring, a rubber body, or other material of suitable elasticity can be used as the elastic body 13. During crushing, the force of the swing jaw acting through the frame toggle plate 64 acts upward on the toggle block 1, therefore the elastic bodies 13, 13 need not be of a strength to resist the swinging force. An upper sliding liner 14 and a lower sliding liner 15, each of low frictional resistance, are bonded to the upper surface of the upper block 11 and the lower surface of the lower block 12, respectively. These liners facilitate the sliding action of the toggle block 1, and bear the erosion caused with sliding. An upper support member 2 and a lower support member 3, each made of steel, are affixed like shelves and separated by a specified distance, onto the machine frame. The upper support member 2 has a horizontal upper sliding face 21, and the lower support member 3 has a lower sliding face 21 that is parallel to the upper sliding face. The distance betweeen the two sliding faces is set to be equal to the depth of the toggle block 1. The elastic bodies 13, 13 are compressed to sandwich the toggle block 1 between the upper sliding face 21 and the lower sliding face 31. In this state, the natural tendency for the compressed elastic bodies 13, 13 is to expand, the force of which causes the upper sliding liner 14 and the lower sliding liner 15 to press and be clamped firmly against the upper sliding face 21 and the lower sliding face 31, respectively. A device for applying an external force is attached to the toggle block 1 to enable it to slide back and forth. For example, a cylinder 4 can be connected to the back face of toggle block 1, wherein contraction and expansion of the cylinder will enable the toggle block to slide. Action During crushing, the cylinder 4 remains immobile, and the expansive force of the elastic bodies 13, 13 attempting to expand causes the toggle block 1 to press and remain clamped against the upper sliding face 21 and the lower sliding face 31. During adjustment of the cavity or gap width, the cylinder 4 is made to expand or contract, wherein the synergistic action of the sliding action of the upper and the lower sliding liners 14, 15 of low frictional resistance, and the release of the toggle block as the elastic bodies 13, 13 contract, enable the toggle block 1 to slide easily.

Claims: A sliding mechanism for the toggle block of a jaw crusher, comprising a toggle block (1) supporting one end of a toggle plate (64) connected at the other end to the bottom of a swing jaw, characterized in that the toggle block comprises an upper block (11) and a lower block (12), joined by an elastic body (13), sandwiched between an upper support member (2) and a lower support member (3) that are joined to a machine frame, the toggle block (1) being slidable back and forth with the application of an external force (4). The sliding mechanism for the toggle block of a jaw crusher as claimed in claim 1, in which sliding liners of low frictional resistance are bonded to the top face of the upper block and the bottom face of the lower block. The sliding mechanism for the toggle block of a jaw crusher as claimed in claim 1 or claim 2, in which a cylinder connected to the toggle block is used as a means to apply an external force to the toggle block. The sliding mechanism for the toggle block of a jaw crusher as claimed in claim 1, claim 2 or claim 3, in which a spring is used as the elastic body that joins the upper block to the lower block. The sliding mechanism for the toggle block of a jaw crusher as claimed in claim 1, claim 2 or claim 3, in which a rubber body is used as the elastic body that joins the upper block to the lower block.

Inventors: KAYA TAKATO, KAYA, TAKATO, KAYA, Takato, Kotobuki Engineering &amp;Man. Co., Ltd.
Applicants: KOTOBUKI GIKEN KOGYO KK, KOTOBUKI ENGINEERING & MANUFACTURING CO LTD
Application year: 1995
Main classification: B02C1
IPC codes: B02C1