UHMWPE sheet molding die automatic in and out positioning machine

Abstract

The present application is an automatic entry and exit positioning machine for ultra-high molecular weight polyethylene sheet molding dies, which belongs to the field of polyethylene sheet processing equipment. It includes a molding cavity and a frame arranged on one side thereof, the frame is provided with a guide rail, and the guide rail extends into the molding cavity; an upper punch is provided on the upper top surface of the molding cavity, and a lifting seat is provided on the lower bottom surface; two guide rails are provided, and the two guide rails are symmetrically arranged on both sides of the lifting seat, and lower concave dies are slidably provided on the two guide rails; a positioning component is arranged between the lifting seat and the lower concave die; a power unit, the power unit is connected to the lower concave die, drives the lower concave die to slide along the guide rail, and then enters and exits the molding cavity; through the above technical scheme, the lower concave die is automatically entered and exited the molding cavity and positioned, and cooperates with the upper punch in the molding cavity to automatically realize the molding of polyethylene sheets, and the molding die of the present application can not only mold small-area polyethylene sheets, but also mold large-area polyethylene sheets with a long distance, and the operation is very convenient.

Description

Technical Field

[0001] The utility model relates to the field of polyethylene sheet processing moulds, in particular to an automatic in-and-out positioning machine for ultra-high molecular weight polyethylene sheet moulding moulds. Background Art

[0002] Polyethylene sheets have the advantages of being non-toxic, having a smooth and flat surface, being corrosion-resistant, having excellent electrical insulation properties, and having good low-temperature properties. They are widely used in industries such as chemical and electric power. Ultra-high molecular weight polyethylene sheets are polyethylene with a molecular weight of more than 1 million. They have higher mechanical properties than general high-density polyethylene, but have poor fluidity and extremely high viscosity in the molten state. They are rubber-like high-viscosity elastic bodies and are generally made by hot pressing. Hot pressing production is generally achieved using a compression mold. Currently, there are various compression molds on the market, but they are similar. They generally have an upper convex mold and a lower hot pressing plate, such as the lower concave mold and the convex mold disclosed in Patent 220517321U. The polyethylene sheet material is placed in the concave mold and heated, and then the convex mold and the concave mold are extruded to achieve the shaping of the polyethylene sheet. However, the combined mold disclosed in the above technology does not have a component that automatically drives the die and the punch to cooperate and extrude, and the degree of automation is low. In order to improve the degree of automation, the punch and the die are automatically extruded together. Patent CN215095096U discloses a component that can automatically cooperate and extrude the punch and the die, and a hydraulic rod is connected to the punch, and the punch and the die are extruded together by telescoping the hydraulic rod. However, this structure can still meet the use needs for small-area polyethylene sheets, but it is powerless for large-area polyethylene sheets with a long distance. Utility Model Content

[0003] The existing polyethylene sheet has a low degree of automation in the molding and in-and-out operations of the molding die. In order to improve the degree of automation, the existing technology adds automatic extrusion components to the concave and convex molds, which can still meet the needs for small-area polyethylene sheets, but is powerless for large-area polyethylene sheets with a long distance. At least one purpose or one aspect of the present application can solve the above problem, and specifically designs an automatic in-and-out positioning machine for ultra-high molecular weight polyethylene sheet molding dies, and the technical solution adopted is:

[0004] The automatic in-and-out positioning machine for ultra-high molecular weight polyethylene sheet molding dies comprises a molding cavity and a frame arranged on one side thereof, the frame is provided with a guide rail, and the guide rail extends into the molding cavity; an upper punch is provided on the upper top surface of the molding cavity, and a lifting seat is provided on the lower bottom surface;

[0005] Two guide rails are provided, and the two guide rails are symmetrically arranged on both sides of the lifting seat, and lower concave molds are slidably provided on the two guide rails;

[0006] A positioning component, which is arranged between the lifting seat and the lower concave die;

[0007] The power unit is connected with the lower concave die and drives the lower concave die to slide along the guide rail and then enter and exit the die cavity.

[0008] In one embodiment, the positioning component includes two positioning holes and two connecting holes arranged at one end of the lower die, and the lifting seat is provided with two elastic positioning pins cooperating with the two positioning holes, and a first inclined block is connected between the two elastic positioning pins, and the upper surface of the first inclined block is an inclined surface.

[0009] Preferably, a slide rail is further provided on the frame along the direction of the guide rail, a slide seat is provided on the slide rail, two elastic connecting pins cooperating with the two connecting holes are provided on the slide seat, a second inclined block is connected between the two elastic connecting pins, the inclination direction of the second inclined block is opposite to the inclination direction of the first inclined block, a telescopic member is further connected to the slide seat, two third inclined blocks are connected to the telescopic rod end of the telescopic member, the inclination directions of the two third inclined blocks are opposite, one of the third inclined blocks can cooperate with the first inclined block to disengage the elastic positioning pin from the positioning hole, and the other third inclined block can cooperate with the second inclined block to disengage the elastic connecting pin from the connecting hole,

[0010] In one embodiment, one end of the lower die is provided with a plurality of positioning holes, one end of the lifting seat is provided with a plurality of elastic positioning pins cooperating with the positioning holes, the lower end surface of the positioning hole is an inclined surface, and the top end of the elastic positioning pin is an inclined surface and is arranged higher than the upper surface of the lifting seat.

[0011] Preferably, the power unit comprises:

[0012] A reduction motor, wherein the reduction motor is arranged on the frame;

[0013] A driving sprocket and a passive sprocket are arranged on the frame at intervals along the length direction of the guide rail;

[0014] The chain is wound between the driving sprocket and the driven sprocket, and the chain is connected to the lower die.

[0015] Preferably, two driving sprockets, two passive sprockets, and two chains are provided. The two passive sprockets and the two driving sprockets are spaced apart in the direction perpendicular to the guide rail. The two driving sprockets are connected to the reduction motor located therebetween through a transmission shaft, and the two chains are correspondingly transmitted and wound around the two driving sprockets and the two passive sprockets.

[0016] Preferably, two guide wheel groups are correspondingly provided on both sides of the lower die, each guide wheel group includes at least two guide wheels, each guide wheel is rotatably connected to the lower die through a wheel frame, and the guide wheels are slidably arranged on the guide rails.

[0017] Preferably, it also includes at least two pressing components, the two pressing components are located on both sides of the frame respectively, and each pressing component is arranged outside the corresponding die cavity of the frame, which includes:

[0018] The first telescopic cylinder is vertically arranged on the frame, the telescopic rod end of the first telescopic cylinder is hinged to one end of the pressure rod, the center of the pressure rod is hinged to the top end of the connecting rod, and the bottom end of the connecting rod is hinged to the frame.

[0019] Preferably, the lower concave mold includes a lower concave plate and a lower heating plate, and the lower heating plate is located on the lower surface of the lower concave plate. The upper convex mold includes an upper convex plate and an upper heating plate, and the upper heating plate is located on the lower surface of the upper convex plate. The size of the upper heating plate is equal to the inner diameter of the lower concave plate. The upper heating plate and the lower heating plate have an inner cavity for containing a heat-conducting medium.

[0020] Preferably, the lifting seat includes a rectangular lifting plate, and the lower surface of the lifting plate is connected to a plurality of second telescopic cylinders arranged on the frame.

[0021] The utility model can use the above technical scheme to make the lower concave die automatically enter and exit the die cavity and position itself, and cooperate with the upper convex die in the die cavity to automatically realize the molding of the polyethylene sheet. Moreover, the molding die of the present application can not only mold small-area polyethylene sheets, but also large-area polyethylene sheets with a long distance, and the operation is very convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 - Figure 2 is a stereogram showing one of the ways to position the component;

[0023] Figure 3 yes Figure 1 The enlarged view of point I in the middle;

[0024] Figure 4 yes Figure 2 The enlarged view of II in the middle;

[0025] Figure 5 - Figure 6 It is a stereogram in which the positioning component is in another form;

[0026] Figure 7 yes Figure 5 Enlarged view of position III in the middle;

[0027] Figure 8 yes Figure 6 Enlarged view of IV in the middle.

[0028] In the figure, 1, die cavity, 2, frame, 3, guide rail, 4, upper punch, 5, lifting seat, 6, lower die, 7, slide rail, 8, slide seat, 9, power unit, 10, positioning component, 11, clamping component, 12, guide wheel;

[0029] 401, upper convex plate, 402, upper heating plate;

[0030] 501, lifting plate, 502, second telescopic cylinder;

[0031] 601, lower concave plate, 602, lower heating plate;

[0032] 901, reduction motor, 902, driving sprocket, 903, driven sprocket, 904, chain;

[0033] 1001, elastic positioning pin, 1002, connecting hole, 1003, first inclined block, 1004, second inclined block, 1005, third inclined block, 1006, telescopic member, 1007, elastic connecting pin, 1008, positioning hole;

[0034] 1101. first telescopic cylinder, 1102. pressure rod, 1103. connecting rod. DETAILED DESCRIPTION

[0035] In order to clearly illustrate the technical features of the present invention, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0036] In addition, in the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0037] like Figure 1 As shown in FIG. 4, the automatic entry and exit positioning machine for ultra-high molecular weight polyethylene sheet molding dies includes a die cavity 1 and a frame 2 arranged on one side thereof. The frame 2 is provided with a running wheel at the bottom, which is driven by a driving mechanism to move forward and backward and left and right, and can be moved and switched between the hot press and the cold press. The frame 2 has a guide rail 3, which extends from the outside of the die cavity 1 to the inside of the die cavity 1. An upper punch 4 is provided on the upper top surface of the die cavity 1, and a lifting seat 5 is provided on the lower bottom surface. Two guide rails 3 are provided, and the two guide rails 3 are symmetrically arranged front and back, and each guide rail 3 is extended left and right. A lower die 6 is slidably provided on the two guide rails 3, and a positioning component 10 is provided between the lower die 6 and the lifting seat 5, which is used to position the lower die 6 in the die cavity 1. The positioning state is that the outer diameter of the upper punch 4 can extend into the lower die 6, and the ultra-high molecular weight polyethylene sheet material in the lower die 6 is molded.

[0038] The lower concave die 6 is driven to enter and exit the die cavity 1 by the power unit 9. The power unit 9 is connected to the lower concave die 6 to drive the lower concave die 6 to slide along the guide rail 3 and then enter and exit the die cavity 1. After the power unit 9 drives the lower concave die 6 to enter and exit the die cavity 1, it is directly positioned through the positioning component 10 to fix the lower concave die 6. There is no need for manual individual positioning, which simplifies the positioning and molding operation process and improves the ease of operation.

[0039] In one embodiment, the structure of the positioning component 10 specifically includes two positioning holes 1008 and two connecting holes 1002 arranged at one end of the lower die 6. The positioning holes 1008 and the connecting holes 1002 are not in a straight line in the front-to-back and left-to-right directions. Two elastic positioning pins 1001 cooperating with the two positioning holes 1008 are arranged at one end of the lifting seat 5. A first inclined block 1003 is connected between the two elastic positioning pins 1001 via a connecting plate, and the upper surface of the first inclined block 1003 is an inclined surface.

[0040] The structure of the elastic locating pin 1001 here is an existing mature technology, with a sealing head at the bottom, a conical head at the top, a necked section in the middle, and a spring sleeved on the periphery of the necked section. The spring force can clamp the locating pin into the locating hole 1008 when the locating pin is aligned with the locating hole 1008, and the locating pin can be removed from the locating hole 1008 only under the action of external force.

[0041] Furthermore, based on the structure of the above-mentioned positioning component 10, a slide rail 7 is also provided on the frame 2 along the left and right directions, a slide seat 8 is provided on the slide rail 7, and two elastic connecting pins 1007 cooperating with two connecting holes 1002 are provided on the slide seat 8. The two elastic connecting pins 1007 can be inserted into the connecting holes 1002 to connect the slide seat 8 with the lower die 6, so that the sliding of the slide seat 8 can drive the lower die 6 to slide. A second inclined block 1004 is connected between the two elastic connecting pins 1007, and the inclination direction of the second inclined block 1004 is opposite to that of the first inclined block 1003. A telescopic member 1006 is also connected to the slide seat 8, and the telescopic member 1006 is horizontally arranged left and right. Two third inclined blocks 1005 are connected to the telescopic rod end of the telescopic member 1006, and the inclination directions of the two third inclined blocks 1005 are opposite. One of the third inclined blocks 1005 can cooperate with the first inclined block 1003 to disengage the elastic positioning pin 1001 from the positioning hole 1008, and the other third inclined block 1005 can cooperate with the second inclined block 1004 to disengage the elastic connecting pin 1007 from the connecting hole 1002.

[0042] Based on the above embodiment, the process of pulling the lower die 6 out of the die cavity 1 is as follows: the telescopic rod of the telescopic member 1006 is extended, and the inclined surface of one of the third inclined blocks 1005 connected to the end of the telescopic rod is continuously fitted with the inclined surface of the first inclined block 1003, and the elastic positioning pin 1001 is continuously pressed out from the positioning hole 1008, so that the elastic positioning pin 1001 is disengaged from the positioning hole 1008, and then the telescopic rod of the telescopic member 1006 continues to extend, and the elastic connecting pin 1007 on the slide 8 enters the connecting hole 1002 of the lower die 6. At this time, the slide 8 is convenient for connecting with the lower die 6. At this time, the power unit 9 is actuated to drive the slide 8 to move to the left along the slide rail 7, thereby pulling the lower die 6 out of the die cavity 1. When it is necessary to push the lower die 6 into the die cavity 1, the power unit 9 moves in the reverse direction to drive the slide 8 to move to the right, and the lower die 6 is pushed into the die cavity 1. When the positioning hole 1008 of the lower die 6 is located directly above the elastic positioning pin 1001, the telescopic rod of the telescopic member 1006 retracts, and the elastic positioning pin 1001 penetrates into the positioning hole 1008 to position the lower die 6. At this time, the telescopic member 1006 continues to retract until the third inclined block 1005 continuously presses down the second inclined block 1004, so that the elastic connecting pin 1007 is disengaged from the connecting hole 1002.

[0043] It should be noted that when the positioning component 10 adopts the above structure, the corresponding frame 2 can be movable, which can be used in conjunction with multiple die cavities 1 to push the lower die 6 into or pull it out of the die cavity 1.

[0044] In one embodiment, the positioning of the lower die 6 can also be achieved in the following manner: Figure 5 As shown in Figure 8, one end of the lower die 6 is provided with a plurality of the above-mentioned positioning holes 1008. In the present embodiment, four positioning holes 1008 are provided, which are divided into two groups and are located at the left and right ends of the lower die 6. The distances between the two groups of positioning holes 1008 are unequal. One end of the lifting seat 5 is also provided with the same number of elastic positioning pins 1001 as the positioning holes 1008. Here, four elastic positioning pins 1001 are also provided. The four elastic positioning pins 1001 are divided into two groups and are located at the left and right ends of the lifting seat 5. The positioning holes 1008 here are in the form of protruding from the side surface of the lower die 6. The lower end surface of the positioning holes 1008 is an inclined surface. The top end of the elastic positioning pin 1001 is an inclined surface and is arranged higher than the upper surface of the lifting seat 5. When the lower die 6 enters the die cavity 1, since the lower surface of the positioning hole 1008 is an inclined surface, the lower die 6 presses down the elastic positioning pin 1001 when moving. When the elastic positioning pin 1001 is aligned with the positioning hole 1008, the elastic positioning pin 1001 penetrates into the positioning hole 1008 to position the lower die 6. In this embodiment, the above-mentioned elastic positioning pin 1001 is manually removed from the positioning hole 1008. The manual operation removes the elastic positioning pin 1001 from the positioning hole 1008, thereby releasing the positioning of the lower die 6.

[0045] It should be noted that when the positioning component 10 adopts the above structure, the corresponding frame 2 can be fixed, so that one die cavity 1 corresponds to one frame 2 and cannot be moved at will.

[0046] Further, the structure of the power unit 9 specifically includes a reduction motor 901, a driving sprocket 902, a driven sprocket 903 and a chain 904, and the chain 904 is wound between the driving sprocket 902 and the driven sprocket 903, and is connected to the slide 8. The reduction motor 901 is arranged near the left end of the frame 2, and the driving sprocket 902 and the driven sprocket 903 are arranged on the frame 2 at intervals along the length direction of the guide rail 3, including the driven sprocket 903 can be arranged outside the die cavity 1, and can also be arranged inside the die cavity 1.

[0047] Specifically, when the power unit 9 drives the lower die 6 to move by driving the slide 8, the passive sprocket 903 can be set outside the die cavity 1, and the active sprocket 902 and the passive sprocket 903 are set close to the center of the frame 2, and the reduction motor 901, the active sprocket 902 and the passive sprocket 903 are all located below the slide 8, so that the movement of the lower die 6 will not be affected.

[0048] When the power unit 9 directly drives the lower die 6 to move, the passive sprocket 903 can be set inside the die cavity 1, and the active sprocket 902 and the passive sprocket 903 should be set close to the front and rear sides of the frame 2, so that the chain 904 will not interfere with the lower die 6 and the slide seat 8.

[0049] Furthermore, two driving sprockets 902 are provided, two passive sprockets 903 are provided, and two chains 904 are provided. The two passive sprockets 903 and the two driving sprockets 902 are spaced apart in the front-to-rear direction. The two driving sprockets 902 are connected to the reduction motor 901 located therebetween through a transmission shaft. The two chains 904 are correspondingly transmitted and wound around the two driving sprockets 902 and the two passive sprockets 903. Chain transmission is more suitable for transmission connection methods with a larger span. At the same time, the transmission is relatively reliable and basically no slippage will occur.

[0050] Furthermore, two guide wheel groups are correspondingly provided on both sides of the lower die 6, and each guide wheel group includes at least two guide wheels 12. Each guide wheel 12 is rotatably connected to the lower die 6 through a wheel frame, and the guide wheels 12 are slidably arranged on the guide rail 3. While the reduction motor 901 drives the chain 904 to circle, the chain 904 drives the lower die 6 directly or indirectly connected thereto to shuttle inside and outside the die cavity 1.

[0051] Further, when the lower die 6 is pulled out of the die cavity 1, the polyethylene material in the lower die 6 has been molded into a polyethylene sheet. When the polyethylene sheet needs to be taken out, in order to prevent the lower die 6 from moving, the present application further includes at least two clamping components 11, the two clamping components 11 are correspondingly located at the front and rear sides of the frame 2, and each clamping component 11 is arranged outside the die cavity 1 corresponding to the frame 2, specifically including:

[0052] The first telescopic cylinder 1101 is vertically arranged on the frame 2. The telescopic rod end of the first telescopic cylinder 1101 is hinged to one end of the pressure rod 1102, and is hinged to the top end of the connecting rod 1103 near the center of the pressure rod 1102. The bottom end of the connecting rod 1103 is hinged to the frame 2. The pressure rod 1102 can press and fix the lower die 6.

[0053] Furthermore, the above-mentioned lower concave mold 6 includes a lower concave plate 601 and a lower heating plate 602, and the lower heating plate 602 is located on the lower surface of the lower concave plate 601. The upper convex mold 4 includes an upper convex plate 401 and an upper heating plate 402, and the upper heating plate 402 is located on the lower surface of the upper convex plate 401. The size of the upper heating plate 402 is equal to the inner diameter of the lower concave plate 601. The upper heating plate 402 and the lower heating plate 602 have an inner cavity for containing a heat-conducting medium, and the heat-conducting medium here can be circulating heat-conducting oil.

[0054] Furthermore, the lifting seat 5 includes a rectangular lifting plate 501, the lower surface of which is connected to a plurality of second telescopic cylinders 502 arranged on the frame 2. The second telescopic cylinders 502 drive the lifting plate 501 to rise and fall. When the lower concave plate 601 moves to the position directly above the corresponding lifting plate 501 in the die cavity 1, the second telescopic cylinders 502 drive the lifting plate 501 to rise, so that the upper punch 4 is continuously pressed into the lower concave die 6, pressing the heated polyethylene material in the lower concave die 6 into a sheet.

[0055] The above-mentioned specific implementation manner cannot be used as a limitation on the protection scope of the present utility model. For those skilled in the art, any replacement, improvement or change made to the implementation manner of the present utility model falls within the protection scope of the present utility model.

[0056] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. Ultra-high molecular weight polyethylene sheet molding die automatic entry and exit positioning machine, characterized in that: It includes a die cavity and a frame arranged on one side thereof, wherein the frame is provided with a guide rail, and the guide rail extends into the die cavity; An upper convex mold is provided on the upper top surface of the die cavity, and a lifting seat is provided corresponding to the lower bottom surface of the die cavity; Two guide rails are provided, and the two guide rails are symmetrically arranged on both sides of the lifting seat, and lower concave molds are slidably provided on the two guide rails; A positioning component, the positioning component is arranged between the lifting seat and the lower concave mold; A power unit is connected to the lower concave die to drive the lower concave die to slide along the guide rail and then enter and exit the die cavity.

2. The automatic entry and exit positioning machine for ultra-high molecular weight polyethylene sheet molding dies according to claim 1, characterized in that: The positioning component includes two positioning holes and two connecting holes arranged at one end of the lower die, and the lifting seat is provided with two elastic positioning pins cooperating with the two positioning holes. A first inclined block is connected between the two elastic positioning pins, and the upper surface of the first inclined block is an inclined surface.

3. The automatic entry and exit positioning machine for ultra-high molecular weight polyethylene sheet molding dies according to claim 2, characterized in that: The frame is also provided with a slide rail along the direction of the guide rail, the slide rail is provided with a slide seat, the slide seat is provided with two elastic connecting pins cooperating with the two connecting holes, a second inclined block is connected between the two elastic connecting pins, and the inclination direction of the second inclined block is opposite to the inclination direction of the first inclined block. The slide seat is also connected to a telescopic member, and two third inclined blocks are connected to the telescopic rod end of the telescopic member, and the inclination directions of the two third inclined blocks are opposite, one of the third inclined blocks can cooperate with the first inclined block to disengage the elastic positioning pin from the positioning hole, and the other third inclined block can cooperate with the second inclined block to disengage the elastic connecting pin from the connecting hole.

4. The automatic entry and exit positioning machine for ultra-high molecular weight polyethylene sheet molding dies according to claim 1, characterized in that: One end of the lower die is provided with a plurality of positioning holes, one end of the lifting seat is provided with a plurality of elastic positioning pins matched with the positioning holes, the lower end surface of the positioning holes is an inclined surface, and the top end of the elastic positioning pins is an inclined surface and is arranged higher than the upper surface of the lifting seat.

5. The automatic entry and exit positioning machine for ultra-high molecular weight polyethylene sheet molding dies according to claim 3 or 4, characterized in that: The power unit comprises: A reduction motor, wherein the reduction motor is arranged on the frame; A driving sprocket and a passive sprocket, wherein the driving sprocket and the passive sprocket are arranged on the frame at intervals along the length direction of the guide rail; A chain is driven and wound between the driving sprocket and the driven sprocket, and the chain is connected to the lower die.

6. The automatic entry and exit positioning machine for ultra-high molecular weight polyethylene sheet molding dies according to claim 5, characterized in that: Two driving sprockets are provided, two passive sprockets are provided, and two chains are provided. The two passive sprockets and the two driving sprockets are spaced apart in a direction perpendicular to the guide rail. The two driving sprockets are connected to the reduction motor located therebetween through a transmission shaft, and the two chains are correspondingly transmitted and wound between the two driving sprockets and the two passive sprockets.

7. The automatic entry and exit positioning machine for ultra-high molecular weight polyethylene sheet molding dies according to claim 6, characterized in that: Two guide wheel groups are correspondingly arranged on both sides of the lower concave die, each guide wheel group includes at least two guide wheels, each guide wheel is rotatably connected to the lower concave die through a wheel frame, and the guide wheels are slidably arranged on the guide rails.

8. The automatic entry and exit positioning machine for ultra-high molecular weight polyethylene sheet molding dies according to claim 1, characterized in that: It also includes at least two pressing components, the two pressing components are located on both sides of the frame respectively, and each pressing component is arranged outside the frame corresponding to the die cavity, which includes: The first telescopic cylinder is vertically arranged on the frame, the telescopic rod end of the first telescopic cylinder is hinged to one end of the pressure rod, and is hinged to the top end of the connecting rod near the center of the pressure rod, and the bottom end of the connecting rod is hinged to the frame.

9. The automatic entry and exit positioning machine for ultra-high molecular weight polyethylene sheet molding dies according to claim 1, characterized in that: The lower concave mold includes a lower concave plate and a lower heating plate, and the lower heating plate is located on the lower surface of the lower concave plate. The upper convex mold includes an upper convex plate and an upper heating plate, and the upper heating plate is located on the lower surface of the upper convex plate. The size of the upper heating plate is equal to the inner diameter of the lower concave plate. The upper heating plate and the lower heating plate have inner cavities for containing heat-conducting media.

10. The automatic entry and exit positioning machine for ultra-high molecular weight polyethylene sheet molding dies according to claim 1, characterized in that: The lifting seat comprises a rectangular lifting plate, and the lower surface of the lifting plate is connected to a plurality of second telescopic cylinders arranged on the frame.

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