A toggle mechanism of an injection molding machine

Abstract

The present invention provides a toggle mechanism for an injection molding machine, which includes a second plate, a long toggle, a hook toggle, a tail plate, and a motor screw assembly disposed on the tail plate. On one side of the second plate, a plurality of pairs of second plate hinge seats arranged horizontally in the vertical direction are arranged side by side. On the tail plate and on the side opposite to the second plate hinge seats, tail plate hinge seats corresponding to the second plate hinge seats are provided. Between each pair of tail plate hinge seats, it is hinged to the first hinge side of the hook toggle. The second hinge side of the hook toggle is hinged to one end of the long toggle, and the other end of the long toggle is hinged to the second plate hinge seat. The free end of the motor screw assembly passes through the middle of the tail plate and is fixedly connected to the central hole of the crosshead. A plurality of small hinges are rotatably connected to the upper and lower ends of the crosshead, and the other end of each small hinge is hinged to the third hinge side of the corresponding hook toggle. The toggle mechanism of the injection molding machine of the present invention has a compact design structure, occupies a small space, has good transmission stability, high precision, long service life, and is convenient for assembly and maintenance, with low cost, thus having a broad market prospect.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molding machines, and particularly to a toggle mechanism of an injection molding machine. Background Art

[0002] An injection molding machine, also known as an injection molding press or an injection machine, is the main molding equipment for forming various shaped plastic products by using thermoplastic or thermosetting plastics with a plastic molding die.

[0003] With the development of society, injection molding machines are used more and more widely. Even during the continuous update of injection molding machines, some new problems will occur. Since the toggle mechanism of the existing injection molding machine often has to inject large-tonnage molds, which are heavy and large in size, and the self-weights of the second plate and the tail plate are also relatively large, the toggle mechanism needs to bear greater forces during operation. Therefore, the toggle mechanism often bears excessive forces and deforms, or even breaks. In the lightest case, it affects the transmission accuracy, and in the worst case, it causes damage to the equipment, reducing the service life of the equipment. In addition, most of the traditional toggle mechanisms of injection molding machines use hydraulic cylinders as the drive system, which have complex structures, inconvenient maintenance, and relatively large equipment volumes. Therefore, how to effectively solve the above problems is an urgent problem for those skilled in the art. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides a toggle mechanism of an injection molding machine with a compact design structure, small occupied space, good transmission stability, high precision, long service life during mold clamping or mold opening, convenient assembly and maintenance, and low cost.

[0005] The present invention is achieved through the following technical solutions:

[0006] The present invention provides a toggle mechanism of an injection molding machine, including a second plate, a long toggle, a hook toggle, a tail plate, and a motor screw assembly disposed on the tail plate. A plurality of pairs of second-plate hinge seats arranged horizontally in the up-and-down direction are disposed on one side of the second plate. Tail-plate hinge seats corresponding to the second-plate hinge seats are disposed on the tail plate on the side opposite to the second-plate hinge seats. The first hinge side of the hook toggle is hinged between each pair of tail-plate hinge seats. The second hinge side of the hook toggle is hinged to one end of the long toggle, and the other end of the long toggle is hinged to the second-plate hinge seat. The free end of the motor screw assembly passes through the middle of the tail plate and is fixedly connected to the central hole of the crosshead. A plurality of small hinges are rotatably connected to the upper and lower ends of the crosshead, and the other end of each small hinge is hinged to the third hinge side of the corresponding hook toggle.

[0007] Further, the hook toggle includes a first hinge hole penetrating through the first hinge side, a second hinge hole penetrating through the second hinge side, and a third hinge hole corresponding to the third hinge side. A hook-toggle hinge shaft is provided through the first hinge hole, the second hinge hole, and the third hinge hole. A copper sleeve is disposed between the hook-toggle hinge shaft and each hinge hole of the hook toggle.

[0008] Furthermore, both end faces of the first hinge hole, the second hinge hole and the third hinge hole of the hook hinge are flush with both end faces of the corresponding hook hinge shaft. A limit groove is provided on the flush end faces and deviates from the axis core of the hook hinge shaft. A limit block is fixedly installed by screws in the limit groove, and the limit block is used for locking the hook hinge shaft and the hook hinge.

[0009] Furthermore, a spacer is provided between the second hinge edge of the hook hinge and the long hinge.

[0010] Furthermore, two pairs of crosshead hinge seats arranged horizontally are provided side by side at the upper and lower ends of the crosshead. The two pairs of crosshead hinge seats are provided with hinge holes along the same axis.

[0011] Furthermore, hinge shafts are sleeved in the hinge holes at the upper and lower ends of the crosshead. Both end faces of the hinge holes are flush with both end faces of the corresponding hinge shafts. A limit strip groove is provided on the flush end faces and deviates from the axis core of the hinge shaft. A limit strip block is fixed in the limit strip groove, and the limit strip block is used to prevent relative displacement between the hinge shaft and the corresponding hinge hole of the crosshead.

[0012] Furthermore, the motor screw rod assembly includes a screw rod penetrating through the tail plate and a screw nut sleeved on the screw rod. A screw rod synchronous pulley is installed at the end of the screw rod. A fixed plate is provided on one side of the tail plate, and a servo motor is installed on the fixed plate. A motor synchronous pulley is provided on the rotating shaft of the servo motor, and the motor synchronous pulley and the screw rod synchronous pulley are connected by a synchronous belt.

[0013] Furthermore, a bearing group is sleeved on the screw rod, the bearing group is sleeved in a bearing seat, the bearing seat is fixedly installed on the tail plate, and a bearing gland is provided on one side of the bearing seat.

[0014] Furthermore, the single-row quantity of the two-plate hinge seats is 4, the single-row quantity of the tail plate hinge seats is 4, the single-row quantity of the hook hinges is 2, the single-row quantity of the small hinges is 2, and the single-row quantity of the long hinges is 3. The width of the long hinge arranged in the middle is greater than the widths of the long hinges arranged on both sides of it.

[0015] Furthermore, arc clearance grooves are respectively provided on the upper and lower inner sides of the tail plate opposite to the two plates. The arc clearance grooves are used for clearance when the hook hinge, the small hinge and the crosshead linkage mechanism are driving.

[0016] Implementing the hinge mechanism of an injection molding machine of the present invention has the following technical features and beneficial technical effects:

[0017] The hinge mechanism of the injection molding machine of the present invention has a compact design structure, occupies a small space, has good transmission stability, high precision, long service life during mold closing or mold opening, and is convenient for assembly and maintenance, with low cost. Therefore, it has a broad market prospect. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a sectional view of the toggle mechanism of the injection molding machine according to an embodiment of the present invention;

[0020] Figure 2 It is a schematic diagram of the overall structure of the toggle mechanism of the injection molding machine according to an embodiment of the present invention;

[0021] Figure 3 It is a schematic diagram of the overall structure of the toggle mechanism of the injection molding machine from another perspective according to an embodiment of the present invention;

[0022] Figure 4 It is a schematic diagram of the exploded structure of the toggle mechanism of the injection molding machine according to an embodiment of the present invention;

[0023] Figure 5 It is a schematic diagram of a partial structure of the toggle mechanism of the injection molding machine according to an embodiment of the present invention;

[0024] Figure 6 It is Figure 5 a schematic diagram of the structure from another perspective;

[0025] Figure 7 It is Figure 5 a schematic diagram of the exploded structure;

[0026] Figure 8 It is a schematic diagram of the structure of a single toggle hook of the toggle mechanism of the injection molding machine according to an embodiment of the present invention;

[0027] Figure 9 It is a schematic diagram of the crosshead structure of the toggle mechanism of the injection molding machine according to an embodiment of the present invention

[0028] Figure 10 It is a schematic diagram of the structure of the motor screw rod assembly installed on the tail plate according to an embodiment of the present invention.

[0029] In the above figures: second plate - 1, long hinge - 2, hook hinge - 3, first hinge edge - 31a, second hinge edge - 32a, third hinge edge - 33a, first hinge hole - 31b, second hinge hole - 32b, third hinge hole - 33b, tail plate - 4, motor screw assembly - 5, screw - 51, screw nut - 52, screw synchronous pulley - 53, fixing plate - 54, servo motor - 55, motor synchronous pulley - 56, synchronous belt - 57, bearing group - 58, bearing seat - 59, bearing gland - 60, second - plate hinge seat - 6, tail - plate hinge seat - 7, crosshead - 8, crosshead hinge seat - 81, hinge hole - 82, small hinge - 9, hook - hinge shaft - 10, copper bushing - 11, limit groove - 12, limit block - 13, spacer - 14, hinge shaft - 15, limit strip groove - 16, limit strip block - 17, arc clearance groove - 18. Detailed implementation manners

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts belong to the scope of protection of the present invention.

[0031] The present invention will be further clarified below with reference to the accompanying drawings and specific implementation manners. It should be understood that the following specific implementation manners are only used to illustrate the present invention and not to limit the scope of the present invention. It should be noted that the terms "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the terms "inner" and "outer" respectively refer to the directions towards or away from the geometric center of a specific component.

[0032] Please refer to Figures 1 to 10, a preferred embodiment of the present invention, a toggle mechanism of an injection molding machine, includes a second plate 1, a long toggle 2, a hook toggle 3, a tail plate 4, and a motor screw assembly 5 provided on the tail plate 4. On one side of the second plate 1, a plurality of pairs of second plate hinge seats 6 arranged horizontally are provided side by side in the up and down direction. The number of the second plate hinge seats 6 in the upper row and the lower row of the second plate 1 is 4 each, and the second plate hinge seats 6 are arranged in correspondence up and down. On the tail plate 4 and on the side opposite to the second plate hinge seats 6, tail plate hinge seats 7 corresponding to the second plate hinge seats 6 are provided. The number of the tail plate hinge seats 7 in the upper row and the lower row of the tail plate 4 is 4 each. Between each pair of tail plate hinge seats 7, it is hinged to the first hinge side 31a of the hook toggle 3. One end of the long toggle 2 is hinged to the second hinge side 32a of the hook toggle 3, and a spacer 14 is provided between the second hinge side 32a of the hook toggle 3 and the long toggle 2. The other end of the long toggle 2 is hinged to the second plate hinge seat 6. The free end of the motor screw assembly 5 passes through the middle of the tail plate 4 and is fixedly connected to the central hole of the crosshead 8. A plurality of small toggles 9 are rotatably connected to the upper and lower ends of the crosshead 8, and the other end of each small toggle 9 is hinged to the corresponding third hinge side 33a of the hook toggle 3.

[0033] In this embodiment, the hook toggle 3 includes a first hinge hole 31b penetrating through the first hinge side 31a, a second hinge hole 32b penetrating through the second hinge side 32a, and a third hinge hole 33b penetrating through the third hinge side 33a. A hook toggle hinge shaft 10 is provided through the first hinge hole 31b, the second hinge hole 32b, and the third hinge hole 33b. A copper sleeve 11 is provided between the hook toggle hinge shaft 10 and each hinge hole of the hook toggle 3.

[0034] The end faces of both ends of the first hinge hole 31b, the second hinge hole 32b, and the third hinge hole 33b of the hook toggle 3 are flush with the end faces of both ends of the corresponding hook toggle hinge shaft 10. A limit groove 12 is provided on the flush end faces and deviates from the axis of the hook toggle hinge shaft 10. A limit block 13 is fixedly installed in the limit groove 12 through screws. The limit block 13 is used for locking the hook toggle hinge shaft 10 and the hook toggle 3. Since the limit groove 12 and the limit block 13 adapted to the limit groove 12 are provided through the end faces of both ends of the hinge hook 3 and the hook toggle hinge shaft 10 and are eccentric to the axis of the hook toggle hinge shaft 10, it is used to prevent the offset of the hinge hole between the hook toggle hinge shaft 10 and the hook toggle 3. This offset includes the relative rotation between the hook toggle hinge shaft 10 and the hook toggle 3 and the axial movement of the hook toggle hinge shaft 10 along the hinge hole of the hook toggle 3.

[0035] In this embodiment, two pairs of crosshead hinge seats 81 arranged horizontally are provided side by side at the upper and lower ends of the crosshead 8. The two pairs of crosshead hinge seats 81 are provided with hinge holes 82 along the same axis. Hinge shafts 15 are sleeved in the hinge holes 82 at the upper and lower ends of the crosshead 8. The end faces of both ends of the hinge holes 82 are flush with the end faces of the corresponding hinge shafts 15. Limiting strip-shaped grooves 16 are provided at positions deviating from the axis cores of the hinge shafts 15 on the flush end faces. Limiting strip-shaped blocks 17 are fixed in the limiting strip-shaped grooves 16. The limiting strip-shaped blocks 17 are used to prevent relative displacement between the hinge shafts 15 and the hinge holes 82 of the corresponding crossheads 8. The displacement includes rotational displacement and axial displacement.

[0036] In this embodiment, the two-plate 1 has two upper and lower rows of two-plate hinge seats 6. The single-row number of the two-plate hinge seats 6 is 4. The single-row number of the tail-plate hinge seats 7 corresponding to the two-plate hinge seats 6 is 4. The single-row number of the hook hinges 3 is 2. The total number of the hook hinges 3 in the upper and lower two rows is 4. The single-row number of the small hinges 9 is 2. The total number of the small hinges 9 in the upper and lower two rows is 4. The single-row number of the long hinges 2 is 3, and the width of the long hinge 2 arranged in the middle is greater than the widths of the long hinges 2 arranged on both sides of it.

[0037] In this embodiment, arc-shaped clearance grooves 18 are respectively provided at the upper and lower inner sides of the tail plate 4 opposite to the two-plate 1. The arc-shaped clearance grooves 18 are used for clearance when the hook hinge, small hinge and crosshead linkage mechanism are in transmission, and the design structure is more compact.

[0038] In this embodiment, the motor screw rod assembly 5 includes a screw rod 51 penetrating through the tail plate 4 and a screw nut 52 sleeved on the screw rod 51. A screw rod synchronous pulley 53 is installed at the end of the screw rod 51. A fixing plate 54 is arranged on one side of the tail plate 4. A servo motor 55 is installed on the fixing plate 54. The rotating shaft of the servo motor 55 is connected to a motor synchronous pulley 56. The motor synchronous pulley 56 and the screw rod synchronous pulley 53 are connected by a synchronous belt 57. A bearing group 58 is sleeved on the screw rod 51. The bearing group 58 is composed of multiple bearings to increase the bearing capacity. The bearing group 58 is sleeved in a bearing seat 59. The bearing seat 59 is fixedly installed on the tail plate 4. A bearing gland 60 is provided on one side of the bearing seat 59.

[0039] Different from the traditional hinge mechanism of an injection molding machine that uses a hydraulic cylinder as a transmission driving device, this embodiment uses the motor screw rod assembly 5 as a power driving device. The motor screw rod assembly 5 consists of a servo motor 55, a motor synchronous pulley 56, a screw rod synchronous pulley 53, and a screw rod synchronous pulley 53 to form a motor power device. The screw rod 51 and the screw nut 52 are driven to move relatively through the motor power device. When the motor screw rod assembly 5 is installed, the structure is compact, the control precision is high, and it has the characteristics of energy saving and no pollution.

[0040] Implementing the hinge mechanism of an injection molding machine of the present invention has the following technical features and beneficial technical effects:

[0041] The hinge mechanism of the injection molding machine of the present invention is designed with a compact structure, small occupied space, good transmission stability, high precision, long service life during mold closing or mold opening, and is convenient for assembly and maintenance with low cost. Therefore, it has broad market prospects.

[0042] The specific embodiments described herein are merely illustrative of the gist of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar ways for substitution, but will not deviate from the gist of the present invention or exceed the scope defined by the appended claims.

Claims

1. A toggle mechanism of an injection molding machine, comprising a second plate (1), a long toggle (2), a hook toggle (3), a tail plate (4), and a motor screw assembly (5) provided on the tail plate (4), characterized in that on one side of the second plate (1), a plurality of pairs of second plate hinge seats (6) arranged horizontally in the vertical direction are provided side by side. On the tail plate (4) and on the side opposite to the second plate hinge seats (6), tail plate hinge seats (7) corresponding to the second plate hinge seats (6) are provided. Between each pair of tail plate hinge seats (7), it is hinged to the first hinge side (31a) of the hook toggle (3). The second hinge side (32a) of the hook toggle (3) is hinged to one end of the long toggle (2). The other end of the long toggle (2) is hinged to the second plate hinge seat (6). The free end of the motor screw assembly (5) passes through the middle of the tail plate (4) and is fixedly connected to the central hole of the crosshead (8). A plurality of small toggles (9) are rotatably connected to the upper and lower ends of the crosshead (8). The other end of each small toggle (9) is hinged to the third hinge side (33a) of the corresponding hook toggle (3); the hook toggle (3) includes a first hinge hole (31b) penetrating through the first hinge side (31a), a second hinge hole (32b) penetrating through the second hinge side (32a), and a third hinge hole (33b) penetrating through the third hinge side (33a). A hook toggle hinge shaft (10) is provided through the first hinge hole (31b), the second hinge hole (32b), and the third hinge hole (33b). A copper sleeve (11) is provided between the hook toggle hinge shaft (10) and each hinge hole of the hook toggle (3); the end faces of both ends of the first hinge hole (31b), the second hinge hole (32b), and the third hinge hole (33b) of the hook toggle (3) are flush with the end faces of both ends of the corresponding hook toggle hinge shaft (10). On the flush end faces, a limiting groove (12) is provided deviating from the axis core of the hook toggle hinge shaft (10). A limiting block (13) is fixedly installed in the limiting groove (12) by screws. The limiting block (13) is used for locking the hook toggle hinge shaft (10) and the hook toggle (3).

2. The toggle mechanism of the injection molding machine according to claim 1, wherein, A spacer (14) is provided between the second hinge side (32a) of the hook toggle (3) and the long toggle (2).

3. The toggle mechanism of the injection molding machine according to claim 1, characterized in that On the upper and lower ends of the crosshead (8), two pairs of crosshead hinge seats (81) arranged horizontally in the horizontal direction are provided side by side. Hinge holes (82) are provided on the two pairs of crosshead hinge seats (81) along the same axis.

4. The toggle mechanism of the injection molding machine according to claim 3, characterized in that, Hinge shafts (15) are sleeved in the hinge holes (82) at the upper and lower ends of the crosshead (8). The end faces of both ends of the hinge holes (82) are flush with the end faces of the corresponding hinge shafts (15). On the flush end faces, a limiting strip groove (16) is provided deviating from the axis core of the hinge shaft (15). A limiting strip block (17) is fixed in the limiting strip groove (16). The limiting strip block (17) is used to prevent the hinge shaft (15) from relatively shifting with respect to the hinge hole (82) of the corresponding crosshead (8).

5. The toggle mechanism of the injection molding machine according to claim 1, characterized in that, The motor screw rod assembly (5) includes a screw rod (51) passing through the tail plate (4) and a screw nut (52) sleeved on the screw rod (51). A screw rod synchronous pulley (53) is installed at the end of the screw rod (51). A fixed plate (54) is arranged on one side of the tail plate (4), and a servo motor (55) is installed on the fixed plate (54). A motor synchronous pulley (56) is provided on the rotating shaft of the servo motor (55), and the motor synchronous pulley (56) is connected to the screw rod synchronous pulley (53) through a synchronous belt (57).

6. The toggle mechanism of the injection molding machine according to claim 5, characterized in that, A bearing group (58) is sleeved on the screw rod (51), and the bearing group (58) is sleeved in a bearing seat (59). The bearing seat (59) is fixedly installed on the tail plate (4), and a bearing gland (60) is arranged on one side of the bearing seat (59).

7. The toggle mechanism of the injection molding machine according to claim 1, characterized in that, The single-row quantity of the two-plate hinge seats (6) is 4, the single-row quantity of the tail plate hinge seats (7) is 4, the single-row quantity of the hook hinges (3) is 2, the single-row quantity of the small hinges (9) is 2, and the single-row quantity of the long hinges (2) is 3. Moreover, the width of the long hinge (2) arranged in the middle is greater than the widths of the long hinges (2) arranged on its two sides.

8. The toggle mechanism of the injection molding machine according to claim 1, wherein, On the upper and lower inner sides of the tail plate (4) opposite to the two plates (1), an arc clearance groove (18) is respectively provided. The arc clearance groove (18) is used for clearance when the hook hinge (3), the small hinge (9), and the crosshead (8) linkage mechanism are in transmission.

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