Upper die holder mechanism of plastic product forming machine

Abstract

According to the upper die holder mechanism of the plastic product forming machine, a die holder up-down adjusting device comprises a chain wheel thread adjusting sleeve, the chain wheel thread adjusting sleeve is provided with an internal thread round hole which is connected with an external thread on a stand column in a matched mode, and the chain wheel thread adjusting sleeve is further provided with an annular supporting part which supports a limiting erecting part on a die holder in a matched mode. An auxiliary lifting adjusting mold locking air cylinder is arranged between the upper mold base and the supporting part. A chain wheel thread adjusting sleeve of the die holder up-and-down adjusting device is matched to drive the upper die holder to conduct up-and-down position adjustment on the stand column, an auxiliary lifting adjustment and die locking air cylinder can be matched to assist lifting adjustment and die locking, loads in the adjusting process are reduced, and the influence of gaps is eliminated after adjustment is completed; during auxiliary lifting adjustment and mold locking, the space position above the upper mold base is not occupied, the upper side of the upper mold base has more space positions for other parts to be installed and arranged, the upper mold base is directly installed on the upper side of the upper mold base and installed nearby, installation is convenient, execution control is also convenient, and the control precision is relatively higher.

Description

Technical Field

[0001] The utility model relates to plastic product thermoforming equipment, in particular to an upper die seat mechanism of a plastic product forming machine. Background Art

[0002] In a plastic product molding machine, the upper and lower molds (including molding molds and / or punching molds or molding molds with punching) need to be closed and opened in coordination. The upper mold is installed on the upper mold seat of the upper mold seat mechanism and can be closed and opened in coordination with the lower mold (such as the flipping and lifting action of the lower mold). According to the specifications of different processing objects (such as plastic products of different specifications and sizes) or molds of different specifications, it is necessary to adjust the height of the upper mold base to facilitate smooth mold closing and mold opening operations. The adjustment device for adjusting the height of the upper mold base is equipped with a locking airbag device for locking the upper mold base after the height is adjusted. The locking airbag device is located above the upper mold base and occupies the space above the upper mold base. In addition, the upper and lower molds (such as the molding upper mold and the molding lower mold) also require corresponding air circuits, water circuits (such as cooling water for cooling the mold) and even wires to be connected during the mold opening and closing process. These lines (air circuits, water circuits or wires, etc.) also need to be connected to the corresponding positions and the corresponding actuators to cooperate with the control, such as the corresponding valves or pumps or controllers and other electrical components to cooperate with the control. When the space above the upper mold base is occupied and the upper part of the upper mold base is crowded, the access layout of these lines is affected, resulting in no space for the actuators to be installed. The actuators are installed in other positions away from the upper mold, resulting in a relatively long path during the control process, affecting sensitivity and stability. Utility Model Content

[0003] In view of the technical problems existing in the background technology, the technical problem solved by the utility model is to provide an optional solution that can realize the up and down position adjustment of the upper mold base, with a reasonable spatial layout that does not occupy too much space above the upper mold base, and an upper mold base mechanism of a plastic product molding machine with a relatively low adjustment load and more stable operation.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions: the upper die base mechanism of the plastic product molding machine includes an upper die base, a column and a die base up and down adjustment device, the upper die base is provided with a connecting hole, and the connecting hole movable sleeve is arranged on the column, which is characterized in that the die base up and down adjustment device includes a sprocket thread adjustment sleeve, a chain and a driving motor, the sprocket thread adjustment sleeve has an internal thread circular hole and an external sprocket part, the external sprocket part is connected to the chain in a transmission manner, the chain is connected to the driving motor in a transmission manner, and the column is provided with an external thread along its vertical direction. The internal threaded circular hole is sleeved outside the external thread, and the internal threaded circular hole is connected to the external threaded matching thread. The sprocket thread adjustment sleeve also has an annular supporting portion, and the upper mold base is provided with a limiting mounting portion. The limiting mounting portion is limitedly mounted above the annular supporting portion, and the limiting mounting portion is supported by the annular supporting portion. A supporting portion is also provided below the upper mold base, and an auxiliary lifting and adjusting locking cylinder is provided between the upper mold base and the supporting portion. One end of the auxiliary lifting and adjusting locking cylinder is connected to the upper mold base, and the other end of the auxiliary lifting and adjusting locking cylinder is connected to the supporting portion.

[0005] The following various optimizations or supplementary explanations can be made on the above technical solutions respectively.

[0006] For example, at least three columns are provided, the columns are distributed on the left and right sides, and a guide sleeve is provided between the connecting hole of the upper mold base and the column.

[0007] Further optimization, the sprocket thread adjustment sleeve connected to the threads on each column is connected to the same set of chain transmission, the drive motor is connected to the top of the upper die base, the top of the upper die base is provided with a motor support frame, the drive motor is installed on the motor support frame, the output shaft of the drive motor is connected to the output sprocket, and the chain is connected to the output sprocket.

[0008] For example, the auxiliary lifting and adjusting clamping cylinder includes a cylinder body, a piston, an end cover and a piston rod. The piston is arranged in the cylinder body, the end cover is connected to one end of the cylinder body, and the piston rod is connected to the piston in the cylinder body and extends from the other end of the cylinder body.

[0009] For example, the cylinder body is connected to the upper die seat, and the piston rod is connected to the support part; a vertical mounting through hole is provided on the upper die seat, the cylinder body is built into the vertical mounting through hole, and the end cover is installed at the upper end of the vertical mounting through hole.

[0010] Further optimization, a narrowing convex ring is provided at the upper end of the vertical mounting through hole, the upper end of the cylinder body is limited by the narrowing convex ring, the end cover adopts a step cover body, the step outer ring of the end cover is limited to the lower side of the narrowing convex ring, and an air channel is provided on the end cover, the air channel has an upper inlet and a lower inlet, the upper inlet and the lower inlet are arranged on the upper side of the end cover, and the lower inlet and the lower are arranged on the lower side of the end cover.

[0011] Among them, the lower end matching sleeve of the end cover is arranged in the cylinder body, and a first sealing ring is also arranged between the end cover and the cylinder body, and the outer ring of the lower end of the end cover is provided with a first annular groove, and the first sealing ring is installed on the first annular groove; a second sealing ring will be arranged between the piston and the cylinder body, and the outer ring of the piston is provided with a second annular groove, and the second sealing ring is installed on the second annular groove.

[0012] For example, the outer sprocket part is located above the annular supporting part, or the outer sprocket part is located below the annular supporting part. The outer sprocket part and the annular supporting part are integrally arranged or separately arranged and connected.

[0013] For another example, the outer ring of the upper section of the column is provided with the external thread, a copper sleeve is provided in the upper port of the connecting hole of the upper die seat, the sprocket thread adjustment sleeve has a sleeve connection portion sleeved in the copper sleeve, the sleeve connection portion is located below the annular supporting portion, and the outer sprocket portion is located above the annular supporting portion; the sprocket thread adjustment sleeve is arranged on the upper side of the upper die seat, and the limit mounting portion is arranged on the upper side of the upper die seat.

[0014] For another example, a convex ring is provided on the sprocket thread adjustment sleeve as an annular supporting part, a limit mounting block is provided on the upper die seat as a limit mounting part, and the limit mounting block is fixedly connected to the upper die seat. The limit mounting block adopts a stepped annular block or at least two stepped arc blocks.

[0015] The beneficial effect of the utility model is that, in the upper die seat mechanism of the plastic product molding machine, not only the sprocket threaded adjustment sleeve of the die seat up and down adjustment device drives the upper die seat to adjust the upper and lower positions on the column, but also the auxiliary lifting adjustment and clamping cylinder can cooperate with the auxiliary lifting adjustment and clamping to reduce the load during the adjustment process and eliminate the influence of the gap after the adjustment is completed, so that the adjustment process is more stable, less burdensome and easier. After the clamping eliminates the influence of the gap, the gap is prevented from affecting the running accuracy, and the jitter caused by the gap is avoided; and the auxiliary lifting adjustment and clamping cylinder is supported by the supporting part under the upper die seat, and does not occupy the space above the upper die seat during auxiliary lifting adjustment and clamping (especially not occupying too much of the area at the four corners), and the upper side of the upper die seat will have more space for other components (such as air circuits, water circuits or wires, etc. and corresponding actuators) to be installed and set, which are directly installed on the upper side of the upper die seat and installed nearby, which is convenient for installation and execution control, and the control accuracy is relatively higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The following describes the relevant details and working principles of the implementation methods and embodiments of the present utility model in conjunction with the accompanying drawings.

[0017] Figure 1 It is a structural schematic diagram of the utility model.

[0018] Figure 2 for Figure 1Schematic diagram of the structure from another angle after hiding part of the structure.

[0019] Figure 3 for Figure 2 Partial structural view.

[0020] Figure 4 It is a rear side view of the upper die base mechanism in the utility model.

[0021] Figure 5 for Figure 4 Medium AA view.

[0022] Figure 6 for Figure 5 Medium BB view.

[0023] Figure 7 for Figure 3 A-direction view.

[0024] Figure 8 for Figure 3 CC view of the .

[0025] In the figure: 1. upper die seat mechanism; 2. upper die seat; 3. column; 4. die seat up and down adjustment device; 5. connecting hole; 6. sprocket thread adjustment sleeve; 7. chain; 8. driving motor; 9. internal threaded circular hole; 10. outer sprocket part; 11. external thread; 12. annular supporting part; 13. limit mounting part; 14. supporting part; 15. auxiliary lifting and adjusting clamping cylinder; 16. guide sleeve; 17. motor supporting frame; 18. output sprocket; 19. transition sprocket; 20. tensioning sprocket; 21. cylinder body; 22. piston; 23. end cover; 24. piston rod; 25. vertical mounting through hole; 26. side wall plate; 27. narrowing convex ring; 28. step outer ring; 29. ​​air channel; 30. air chamber; 31. first annular groove; 32. second annular groove; 33. copper sleeve; 34. sleeve joint; 35. retaining ring. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model; it is obvious that the described embodiments are only part of the embodiments of the implementation of the utility model, rather than all of the embodiments, and all other embodiments obtained by ordinary technicians in this field without making creative work based on the embodiments of the utility model are within the scope of protection of the utility model.

[0027] Referring to the accompanying drawings, in the example of the present embodiment, the upper die base mechanism 1 of the plastic product molding machine includes an upper die base 2, a column 3 and a die base up and down adjustment device 4; the upper die base 2 is provided with a connecting hole 5, and the connecting hole 5 is movably sleeved on the column 3 so that the upper die base 2 can be adjusted up and down on the column 3 (i.e., the guide column).

[0028] The upper die base 2 is adjusted up and down on the column 3 by the die base up and down adjustment device 4 .

[0029] Among them, the mold base up and down adjustment device 4 includes a sprocket thread adjustment sleeve 6, a chain 7 and a drive motor 8. The sprocket thread adjustment sleeve 6 has an internal threaded circular hole 9 and an external sprocket part 10. The external sprocket part 10 is transmission connected to the chain 7, and the chain 7 is transmission connected to the drive motor 8. The drive motor 8 cooperates with the chain 7 to drive the external sprocket part 10 to rotate, so that the sprocket thread adjustment sleeve 6 rotates, and the internal threaded circular hole 9 will also rotate together.

[0030] An external thread 11 is provided on the column 3 along its vertical direction, that is, the external thread 11 takes the vertical axis of the column 3 as the axis, the internal thread hole 9 is sleeved outside the external thread 11, and the internal thread hole 9 is threadedly connected with the external thread 11, that is, the internal thread hole 9 of the thread adjustment sleeve of the chain 7 is sleeved on the external thread 11 of the column 3. When the sprocket thread adjustment sleeve 6 rotates (forward or reverse), the internal thread hole 9 cooperates with the external thread 11 to realize the up and down position adjustment of the sprocket thread adjustment sleeve 6 (on the column 3).

[0031] Among them, the sprocket thread adjustment sleeve 6 also has an annular supporting portion 12, and the upper mold base 2 is provided with a limiting mounting portion 13. The limiting mounting portion 13 is limitedly mounted above the annular supporting portion 12, and the limiting mounting portion 13 is supported by the annular supporting portion 12. When the sprocket thread adjustment sleeve 6 rotates on the column 3 to adjust the up and down position, the annular supporting portion 12 of the sprocket thread adjustment sleeve 6 cooperates to support the limiting mounting portion 13 of the upper mold base 2, which can cooperate to realize the up and down position adjustment of the upper mold base 2. On the column 3, the sprocket thread adjustment sleeve 6 rotates (forward rotation), the position of the sprocket thread adjustment sleeve 6 drops, the annular supporting portion 12 will also drop, and the upper die seat 2 mounted on the annular supporting portion 12 through the limiting mounting portion 13 will also drop under the action of gravity; the sprocket thread adjustment sleeve 6 rotates in the opposite direction (reverse rotation), the position of the sprocket thread adjustment sleeve 6 rises, the annular supporting portion 12 will also rise, and the upper die seat 2 mounted on the annular supporting portion 12 through the limiting mounting portion 13 will also be driven to rise, thereby realizing the up and down position adjustment of the upper die seat 2 (on the column 3).

[0032] Among them, the upper die seat 2 itself and the upper die and other parts installed on it are heavy. The upper die seat 2 cooperates with the sprocket thread adjustment sleeve 6 (the annular supporting part 12) to support a relatively large load; and the upper die operation precision requirement is relatively high. The upper die seat 2 is limitedly mounted on the annular supporting part 12 (the sprocket thread adjustment sleeve 6) through the limiting mounting part 13. The external thread 11 is threadedly connected with the internal thread circular hole 9, and both have a gap. The existence of the gap affects the operation precision and stability. For this purpose, the following settings will be made:

[0033] A support part 14 is also provided below the upper die base 2, and an auxiliary lifting and adjusting mold locking cylinder 15 is provided between the upper die base 2 and the support part 14. One end of the auxiliary lifting and adjusting mold locking cylinder 15 is connected to the upper die base 2, and the other end of the auxiliary lifting and adjusting mold locking cylinder 15 is connected to the support part 14; the upper die base 2 is supported by the support part 14 through the auxiliary lifting and adjusting mold locking cylinder 15.

[0034] During the process of adjusting the upper mold base 2 up and down, the auxiliary lifting and adjusting locking cylinder 15 can not only support the upper mold base 2, but also support the upper mold base 2 upward to reduce the load of the sprocket thread adjustment sleeve 6, and assist the upper mold base 2 (on the column 3) in the up and down position lifting and adjustment. The load of the drive motor 8 is also relatively reduced, and the operation is relatively easier and more stable. In addition, after the upper and lower position lifting and adjusting of the upper mold base 2 is completed, the auxiliary lifting and adjusting locking cylinder 15 can also cooperate with the locking to avoid the gap affecting the operation accuracy and avoid jitter problems caused by the gap. For example, after the adjustment is completed, the upper mold base 2 (upward) is tightened to lock the mold.

[0035] The sprocket thread adjustment sleeve 6 is on the external thread 11 of the column 3, and the annular supporting part 12 on the sprocket thread adjustment sleeve 6 cooperates with the limiting mounting part 13 of the upper mold base 2. During the process of the sprocket thread adjustment sleeve 6 rotating and coordinating to adjust the upper and lower positions of the upper mold base 2, the auxiliary lifting and adjusting locking cylinder 15 cooperates to support the upper mold base 2, thereby reducing the load of the sprocket thread adjustment sleeve 6, reducing the burden on the drive motor 8, and making the operation more stable. Moreover, after the upper and lower positions of the upper mold base 2 are adjusted, the upper mold base 2 can be locked and cooperated with the locking to eliminate the influence of the gap.

[0036] In the upper die base mechanism of the plastic product molding machine, not only the sprocket threaded adjustment sleeve 6 of the die base up and down adjustment device 4 cooperates to drive the upper die base 2 to adjust the upper and lower positions on the column 3, but also the auxiliary lifting adjustment and clamping cylinder 15 can cooperate with the auxiliary lifting adjustment and clamping to reduce the load during the adjustment process and eliminate the influence of the gap after the adjustment is completed, so that the adjustment process is more stable, less burdensome, and easier. After the clamping eliminates the influence of the gap, the gap is prevented from affecting the running accuracy, and the jitter caused by the gap is avoided; and the auxiliary lifting adjustment and clamping cylinder 15 is supported by the support part 14 under the upper die base 2, and does not occupy the space above the upper die base 2 during auxiliary lifting adjustment and clamping. The upper side of the upper die base 2 will have more space for other components (such as air circuits, water circuits or wires, etc. and corresponding actuators) to be installed and set, and is directly installed on the upper side of the upper die base 2, installed nearby, easy to install, and also easy to execute control, and the control accuracy is relatively higher.

[0037] The following optimization or further explanation may be performed based on the above embodiments.

[0038] For example, at least three columns 3 are provided, and the columns 3 are distributed on the left and right. In the figure, four columns 3 are provided, two on the left and two on the right. A guide sleeve 16 is provided between the connecting hole 5 of the upper die seat 2 and the column 3. The upper die seat 2 can move on the column 3 through the guide sleeve 16, and the upper and lower position adjustment is smoother and the operation is more stable. The external thread 11 on each column 3 has a corresponding sprocket thread adjustment sleeve 6.

[0039] In addition, the sprocket thread adjustment sleeve 6 connected to the threads on each column 3 is connected to the same group of chains 7, and the drive motor 8 is connected to the top of the upper die base 2; the top of the upper die base 2 can be provided with a motor support frame 17, and the drive motor 8 is installed on the motor support frame 17, which is convenient for installation and transmission connection with the sprocket chain 7. The output shaft of the drive motor 8 (which may include a reducer) is connected to the output sprocket 18, and the chain 7 is connected to the output sprocket 18. In addition, the top of the upper die base 2 will also be provided with a transition sprocket 19, a tension sprocket 20 with an adjustable position, etc., which are used to cooperate with the chain 7 to drive and connect the output sprocket 18 and each outer sprocket part 10.

[0040] For another example, the auxiliary lifting and adjusting clamping cylinder 15 includes a cylinder body 21, a piston 22, an end cover 23 and a piston rod 24. The piston 22 is arranged in the cylinder body 21, the end cover 23 is connected to one end of the cylinder body 21, and the piston rod 24 is connected to the piston 22 in the cylinder body 21 and extends from the other end of the cylinder body 21. It can also be optimized, the cylinder body 21 is connected to the upper mold base 2, the piston rod 24 is connected to the support part 14, that is, the piston rod 24 extends from the other end of the cylinder body 21 and is connected to the support part 14; wherein, a vertical mounting through hole 25 (generally a circular through hole) is provided on the upper mold base 2, the cylinder body 21 is built into the vertical mounting through hole 25, the end cover 23 is installed at the upper end of the vertical mounting through hole 25, and the entire structure of the auxiliary lifting and adjusting clamping cylinder 15 (except the extended piston rod 24) is almost built into the vertical mounting through hole 25 of the upper mold base 2, making full use of the space of the upper mold base 2, not occupying too much other positions of the plastic product molding machine, and the structure is relatively more compact and the appearance is simpler. The support part 14 can be set on the side wall plate 26 of the molding machine body.

[0041] Further optimization is made, the upper end of the vertical installation through hole 25 is provided with a narrowing convex ring 27 (which narrows and bulges toward the middle, so that the upper end diameter of the vertical installation through hole 25 becomes smaller), the upper end of the cylinder body 21 is limited and matched with the narrowing convex ring 27, the cylinder body 21 is installed into the vertical installation through hole 25 from bottom to top, the upper end of the cylinder body 21 can be pushed against the narrowing convex ring 27, and the narrowing convex ring 27 cooperates with the cylinder body 21 to limit the installation, so that the cylinder body 21 can be installed smoothly in place, which is convenient for assembly, and the cylinder body 21 of the auxiliary lifting and adjusting clamping cylinder 15 and the structure inside the cylinder body 21 can be built into the vertical installation through hole 25; and the end cover 23 can adopt a step cover body, and the step outer ring 2 of the end cover 23 8 is limited at the lower side of the narrowing convex ring 27, the end cover 23 can be installed into the vertical mounting through hole 25 from bottom to top, and is limited by the narrowing convex ring 27 at the upper end of the vertical mounting through hole 25. The outer ring of the end cover 23 is a stepped outer ring 28, and the stepped outer ring 28 of the end cover 23 is blocked and limited by the narrowing convex ring 27 on the upper side. The narrowing convex ring 27 limits the end cover 23 on the upper side, and the end cover 23 is restricted in the vertical mounting through hole 25 of the upper mold base 2 to prevent the end cover 23 from detaching, especially when the auxiliary lifting and adjusting clamping cylinder 15 cooperates to support and lock the upper mold base 2, the air pressure in the auxiliary lifting and adjusting clamping cylinder 15 becomes larger, which will not cause the end cover 23 to detach, and the structure is more stable. Among them, the end cover 23 is provided with a gas channel 29 for gas to enter and exit, and the gas channel 29 has an upper inlet and outlet (a joint can be additionally installed) and a lower inlet and outlet. The space between the end cover 23 and the piston 22 in the cylinder body 21 is an air chamber 30. The upper inlet and outlet are arranged on the upper side of the end cover 23, and the lower inlet and outlet are arranged on the lower side of the end cover 23. Gas can enter and exit (enter and exit) the air chamber 30 through the gas channel 29. The lower end of the end cover 23 is matched with the cylinder body 21, and a first sealing ring is also arranged between the end cover 23 and the cylinder body 21. For example, a first annular groove 31 is arranged on the outer ring of the lower end of the end cover 23, and the first sealing ring is installed on the first annular groove 31, so that the first sealing ring is located between the outer ring of the end cover 23 and the inner wall of the cylinder body 21 to prevent gas leakage. A second sealing ring will be arranged between the piston 22 and the cylinder body 21, and a second annular groove 32 is arranged on the outer ring of the piston 22, and the second sealing ring is installed on the second annular groove 32 to prevent gas leakage. A retaining ring 35 can be provided above the stepped outer ring 28, and a groove ring can be provided on the inner wall of the cylinder body 21. The retaining ring 35 is connected in the groove ring and is matched and connected. The cylinder body 21 can be conveniently connected to the vertical installation through hole 25. Of course, other methods (such as tight fit or fastener connection, etc.) can also be used.

[0042] The outer sprocket part 10 is located above the annular supporting part 12 (as shown in the figure), or the outer sprocket part 10 is located below the annular supporting part 12 (not shown in the figure). The outer sprocket part 10 and the annular supporting part 12 are integrally arranged or separately arranged and connected, and the figure shows an integral arrangement.

[0043] For example, in the figure, the sprocket thread adjustment sleeve 6 is arranged on the upper side of the upper die seat 2, and the limit mounting part 13 is arranged on the upper side of the upper die seat 2. For example, the outer ring of the upper section of the column 3 is provided with the external thread 11, and the upper end of the connecting hole 5 of the upper die seat 2 is provided with a copper sleeve 33. The sprocket thread adjustment sleeve 6 has a sleeve connection part 34, and the sleeve connection part 34 is used to be sleeved in the copper sleeve 33. The sleeve connection part 34 is located below the annular supporting part 12, so that the sprocket thread adjustment sleeve 6 can be supported by the copper sleeve 33 to rotate smoothly. The supporting structure is relatively compact, and the outer sprocket part 10 is located above the annular supporting part 12. For example, a convex ring is provided on the sprocket thread adjustment sleeve 6 as an annular supporting portion 12, which can stably cooperate with and support (hold) the limiting mounting portion 13 of the upper die base 2 during rotation; for another example, a limiting mounting block is provided on the upper die base 2 as the limiting mounting portion 13, and the limiting mounting block is fixedly connected to the upper die base 2, and can be fixedly connected by screws or the like. For example, the limiting mounting block adopts a step annular block or at least two step arc blocks, and two step arc blocks are used in the figure.

Claims

1. An upper die base mechanism of a plastic product forming machine comprises an upper die base (2), a column (3) and a die base up and down adjustment device (4), wherein the upper die base (2) is provided with a connecting hole (5), and the connecting hole (5) is movably sleeved on the column (3), and the characteristics are: The die base up-and-down adjustment device (4) comprises a sprocket thread adjustment sleeve (6), a chain (7) and a drive motor (8); the sprocket thread adjustment sleeve (6) has an internal threaded circular hole (9) and an outer sprocket portion (10); the outer sprocket portion (10) is in driving connection with the chain (7); the chain (7) is in driving connection with the drive motor (8); An external thread (11) is provided on the column (3) along its vertical direction, and the internal thread circular hole (9) is sleeved outside the external thread (11), and the internal thread circular hole (9) and the external thread (11) are threadedly connected. The sprocket thread adjustment sleeve (6) also has an annular supporting portion (12). A limit mounting portion (13) is provided on the upper die seat (2). The position-limiting erection part (13) is position-limitingly erected above the annular supporting part (12), and the position-limiting erection part (13) is supported by the annular supporting part (12). A support portion (14) is further provided below the upper die base (2), and an auxiliary lifting and adjusting mold locking cylinder (15) is provided between the upper die base (2) and the support portion (14); one end of the auxiliary lifting and adjusting mold locking cylinder (15) is connected to the upper die base (2), and the other end of the auxiliary lifting and adjusting mold locking cylinder (15) is connected to the support portion (14).

2. The upper die holder mechanism of the plastic product forming machine according to claim 1, characterized in that: At least three upright posts (3) are provided, and the upright posts (3) are distributed on the left and right sides. A guide sleeve (16) is provided between the connecting hole (5) of the upper die seat (2) and the upright posts (3).

3. The upper die holder mechanism of the plastic product forming machine according to claim 2, characterized in that: The sprocket thread adjustment sleeve (6) connected to the threads on each column (3) is connected to the same group of chains (7) in driving connection. The drive motor (8) is connected to the top of the upper die base (2). The top of the upper die base (2) is provided with a motor support frame (17). The drive motor (8) is installed on the motor support frame (17). The output shaft of the drive motor (8) is connected to the output sprocket (18) in driving connection. The chain (7) is connected to the output sprocket (18) in driving connection.

4. The upper die holder mechanism of the plastic product forming machine according to claim 1, characterized in that: The auxiliary lifting and adjusting mold clamping cylinder (15) comprises a cylinder body (21), a piston (22), an end cover (23) and a piston rod (24). The piston (22) is disposed in the cylinder body (21), the end cover (23) is connected to one end of the cylinder body (21), and the piston rod (24) is connected to the piston (22) in the cylinder body (21) and extends from the other end of the cylinder body (21).

5. The upper die holder mechanism of the plastic product forming machine according to claim 4, characterized in that: The cylinder body (21) is connected to the upper die base (2), and the piston rod (24) is connected to the support portion (14); A vertical mounting through hole (25) is provided on the upper die base (2), the cylinder body (21) is built into the vertical mounting through hole (25), and the end cover (23) is mounted on the upper end of the vertical mounting through hole (25).

6. The upper die holder mechanism of the plastic product forming machine according to claim 5, characterized in that: A narrowing convex ring (27) is provided at the upper end of the vertical installation through hole (25), and the upper end of the cylinder body (21) is limitedly matched with the narrowing convex ring (27). The end cover (23) adopts a stepped cover body, and the stepped outer ring (28) of the end cover (23) is limited to the lower side of the narrowed convex ring (27). The end cover (23) is provided with an air passage (29), and the air passage (29) has an upper inlet and a lower inlet. The upper inlet and outlet are arranged on the upper side of the end cover (23), and the lower inlet and outlet are arranged on the lower side of the end cover (23).

7. The upper die holder mechanism of the plastic product forming machine according to claim 5, characterized in that: The lower end of the end cover (23) is matched with the cylinder body (21), and a first sealing ring is provided between the end cover (23) and the cylinder body (21). The outer ring of the lower end of the end cover (23) is provided with a first annular groove (31), and the first sealing ring is installed on the first annular groove (31); A second sealing ring is arranged between the piston (22) and the cylinder body (21), a second annular groove (32) is arranged on the outer ring of the piston (22), and the second sealing ring is mounted on the second annular groove (32).

8. The upper die holder mechanism of the plastic product forming machine according to claim 1, characterized in that: The outer sprocket portion (10) is located above the annular supporting portion (12), or the outer sprocket portion (10) is located below the annular supporting portion (12); The outer sprocket portion (10) and the annular supporting portion (12) are integrally arranged or separately arranged and connected.

9. The upper die holder mechanism of the plastic product forming machine according to claim 1, characterized in that: The outer ring of the upper section of the column (3) is provided with the external thread (11), the upper end of the connecting hole (5) of the upper die seat (2) is provided with a copper sleeve (33), the sprocket thread adjustment sleeve (6) has a sleeve connection portion (34) sleeved in the copper sleeve (33), the sleeve connection portion (34) is located below the annular supporting portion (12), and the outer sprocket portion (10) is located above the annular supporting portion (12); the sprocket thread adjustment sleeve (6) is arranged on the upper side of the upper die seat (2), and the limit mounting portion (13) is arranged on the upper side of the upper die seat (2).

10. The upper die holder mechanism of the plastic product forming machine according to claim 9, characterized in that: A convex ring is provided on the sprocket thread adjustment sleeve (6) as an annular supporting portion (12). A limit mounting block is provided on the upper die seat (2) as a limit mounting portion (13), and the limit mounting block is fixedly connected to the upper die seat (2); The limiting erection block adopts a step ring block or at least two step arc blocks.

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