A top plate assembly

By adding a sliding mechanism to the top surface of the slide plate group, the torque effect of the mold lip on the sliding mechanism of the bottom surface of the slide plate group is reduced, and the problem of accelerated wear of the sliding mechanism during mold lip separation in the prior art is solved, and more stable and efficient mold operation is achieved, which extends the service life of the mold and improves the quality of the bottle preform products.

CN222727274UActive Publication Date: 2025-04-08GUANG DONG XING LIAN PRECISE MACHINERY
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Patent Information

Application Number
CN202420942450.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-04-30
Publication Date
2025-04-08
Estimated Expiration
2034-04-30

AI Technical Summary

Technical Problem

In the existing injection molds, the mold half lip of the mold lip is separated due to gravity, which increases the torque of the sliding mechanism, causing accelerated wear, which makes it difficult to open the mold lip and defects in the bottle preform.

Method used

A sliding mechanism is added to the top surface of the skateboard group to link multiple sets of skateboard components to slide on the top plate, reducing or eliminating the torque effect of the skateboard components and mold lip on the sliding mechanism of the bottom surface of the skateboard group.

Benefits of technology

It reduces the wear of the sliding mechanism on the bottom surface of the skateboard group, maintains the precision of mold assembly, reduces defects in bottle preforms, ensures quality, and extends the service life of the mold.

✦ Generated by Eureka AI based on patent content.

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Abstract

A top plate assembly includes a top plate, a slide plate group is arranged on the top plate, the slide plate group includes multiple slide plate groups, the bottom surface and the top surface of the slide plate group are respectively provided with sliding mechanisms, the sliding mechanisms link the multiple slide plate groups and enable the multiple slide plate groups to slide on the top plate. In addition to providing a sliding mechanism on the bottom surface of the slide plate group, the utility model also provides a sliding mechanism on the top surface of the slide plate group, and utilizes the sliding mechanism on the top surface of the slide plate group to reduce or even eliminate the moment effect of the slide plate group and the die lip on the sliding mechanism on the bottom surface of the slide plate group under gravity, thereby reducing the wear of the sliding mechanism on the bottom surface of the slide plate group, so that the mold maintains assembly accuracy as a whole, can effectively reduce the defects of the bottle blank product, ensure the quality of the bottle blank product, and at the same time extend the service life of the mold.
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Description

Technical Field

[0001] The utility model relates to the technical field of bottle blank molding, in particular to a top plate assembly. Background Art

[0002] Existing injection molds usually include multiple mounting plates and several molding components, the molding components include a mold lip, a mold core, a mold core cooling tube, a mold cavity and a mold cavity bottom, the mold lip is formed by two half-mold lips, the mold core, the mold core cooling tube, the mold cavity, the mold cavity bottom and the mold lip are configured to be installed correspondingly on the mounting plate, the mold core, the mold lip, the mold cavity and the mold cavity bottom are configured to at least limit part of the bottle blank, so that several molding components in the injection mold can complete the bottle blank molding synchronously, realizing a one-mold multi-cavity injection mold, specifically refer to the application document of the publication (announcement) number CN1178117969A.

[0003] like Figure 1-3 As shown, in the prior art, in order to separate the two half-lips of the die lip, the two half-lips are respectively mounted on the first and second slides of the slide assembly. In order to make the first and second slides slide, generally only the bottom surface of the slide assembly, i.e., the bottom surface of the first and second slides, and the top plate Ⅰ200 are provided with a sliding mechanism Ⅰ100. In the case where the die lip part 300 is large in size and thus heavy in weight, such as the die lip part 300 of the preform with a handle, the center of gravity of the die lip part 300 will be higher than the top surface of the slide for a long distance, which will form a large torque on the first sliding mating surface 400 of the sliding mechanism Ⅰ100, thereby accelerating the loss of the first sliding mating surface 400, and further causing problems such as difficulty in opening the die lip and defects in the preform. At the same time, the rapid loss of the first sliding mating surface 400 will cause the gap of the first sliding mating surface 400 to increase rapidly, resulting in a large movement between the slide and the die lip part 300 during the demoulding process, causing scratches and bruises on the appearance of the preform. Utility Model Content

[0004] In order to overcome the deficiencies of the prior art, the utility model provides a top plate assembly.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A top plate assembly comprises a top plate, on which a slide plate group is arranged, wherein the slide plate group comprises multiple slide plate groups, and is characterized in that the bottom surface and the top surface of the slide plate group are respectively provided with sliding mechanisms, and the sliding mechanisms link the multiple slide plate groups and enable the multiple slide plate groups to slide on the top plate.

[0007] In the utility model, the sliding mechanism is provided on both the left and right sides of the bottom surface of the slide plate group, and / or the sliding mechanism is provided on both the left and right sides of the top surface of the slide plate group.

[0008] In the utility model, multiple groups of the skateboard assemblies are arranged in sequence along the first direction on the top plate, and each group of skateboard assemblies includes a first skateboard and a second skateboard arranged in sequence along the first direction. The first skateboard and the second skateboard are extended along the second direction, and the first direction and the second direction are perpendicular to each other on the plane where the top plate is located.

[0009] In the utility model, the sliding mechanism includes a sliding matching bar, a first sliding bar and a second sliding bar. The sliding matching bar extends along the first direction on the top plate and is fixedly arranged. The first sliding bar and the second sliding bar extend along the first direction on the top plate and are respectively slidably arranged on the left and right sides of the sliding matching bar. Multiple groups of the first sliding plates of the sliding plate assemblies are connected to the first sliding bar, and multiple groups of the second sliding plates of the sliding plate assemblies are connected to the second sliding bar.

[0010] In the present invention, the sliding matching bar is a T-shaped bar, and the first sliding bar and the second sliding bar are respectively a first right-angled bar and a second right-angled bar adapted to the T-shaped bar;

[0011] Alternatively, the sliding matching bar is a first elongated bar, and the first sliding bar and the second sliding bar are respectively a second elongated bar I and a second elongated bar II adapted to the first elongated bar.

[0012] In the utility model, at least one first half-mold lip is sequentially arranged on the first slide plate along the second direction, and a second half-mold lip corresponding to the first half-mold lip is arranged on the second slide plate. The plane between the sliding matching strip and the first sliding strip is the sliding matching surface I, and the plane between the sliding matching strip and the second sliding strip is the sliding matching surface II. For the sliding mechanism arranged on the top surface of the slide plate group, the projections of the first half-mold lip and the second half-mold lip along the second direction fall on their sliding matching surfaces I and II.

[0013] In the utility model, the top surface of the top plate is provided with a mounting groove, and the sliding mechanism of the bottom surface of the slide plate group is arranged in the mounting groove;

[0014] The sliding fit bar is fixedly disposed in the installation groove along the first direction, and the first sliding bar and the second sliding bar are slidingly disposed in the installation groove along the first direction and are slidingly fitted with the left and right sides of the sliding fit bar respectively.

[0015] In the utility model, the top surface of the top plate is provided with an equal height block, the equal height block is connected with a pressure block parallel to the top plate, and the sliding mechanism on the top surface of the slide plate group is arranged between the top surface of the slide plate group and the bottom surface of the pressure block;

[0016] Among them, the sliding matching bar is fixedly arranged on the bottom surface of the pressing block along the first direction, and the first sliding bar and the second sliding bar are slidingly arranged between the top surface of the slide plate group and the bottom surface of the pressing block along the first direction, and are slidingly matched with the left and right sides of the sliding matching bar respectively.

[0017] In the utility model, the top plate assembly also includes a second wear-resistant plate and a third wear-resistant plate, the second wear-resistant plate is respectively arranged between the first sliding bar and the mounting groove, and the second sliding bar and the mounting groove, and the third wear-resistant plate is respectively arranged between the first sliding bar and the pressure block, and the second sliding bar and the pressure block.

[0018] In the present invention, the top plate assembly further comprises a first wear-resistant plate, and the first wear-resistant plate is arranged between the bottom surface of the slide plate assembly and the top surface of the top plate.

[0019] The beneficial effects of the utility model are as follows: in addition to arranging a sliding mechanism on the bottom surface of the slide plate group, the utility model also adds a sliding mechanism on the top surface of the slide plate group, and utilizes the sliding mechanism on the top surface of the slide plate group to reduce or even eliminate the moment effect of the slide plate assembly and the mold lip on the sliding mechanism on the bottom surface of the slide plate group under gravity, thereby reducing the wear of the sliding mechanism on the bottom surface of the slide plate group, maintaining the assembly accuracy of the mold as a whole, effectively reducing the defects of the bottle blank products, ensuring the quality of the bottle blank products, and extending the service life of the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0021] Figure 1 The structure of the prior art is shown in FIG. Figure 1 ;

[0022] Figure 2 The structure of the prior art is shown in FIG. Figure 2 ;

[0023] Figure 3 The structure of the prior art is shown in FIG. Figure 3 ;

[0024] Figure 4 The schematic diagram of the top plate sliding structure in this embodiment is shown in FIG. Figure 1 ;

[0025] Figure 5 The schematic diagram of the top plate sliding structure in this embodiment is shown in FIG. Figure 2 ;

[0026] Figure 6 This is a schematic diagram of the structure of the top plate sliding structure after the die lip is installed in this embodiment;

[0027] Figure 7 The structure of the top plate assembly in this embodiment is schematically shown in FIG. Figure 1 ;

[0028] Figure 8 The structure of the top plate assembly in this embodiment is schematically shown in FIG. Figure 2 . DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present utility model clearer, the technical solution in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model.

[0030] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...), then the directional indication is only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0031] In addition, if there are descriptions involving "first" or "second" etc. in the embodiments of the utility model, the descriptions of "first" or "second" etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0032] Reference Figure 4-8 This embodiment discloses a top plate assembly, including a top plate 3, on which a slide plate group 1 is arranged, and the slide plate group 1 includes multiple groups of slide plate assemblies 11, characterized in that the bottom surface and the top surface of the slide plate group 1 are respectively provided with sliding mechanisms 2, and the sliding mechanisms 2 link multiple groups of the slide plate assemblies 11 and enable multiple groups of the slide plate assemblies 11 to slide on the top plate 3. The utility model adds a sliding mechanism 2 on the top surface of the slide plate group 1, and the sliding mechanism 2 on the top surface of the slide plate group 1 can reduce or even eliminate the moment effect of the slide plate assembly 11 and the die lip on the sliding mechanism 2 on the bottom surface of the slide plate group 1 under gravity.

[0033] As a preferred embodiment, the sliding mechanism 2 is provided on both the left and right sides of the bottom surface of the skateboard group 1, and the sliding mechanism 2 is provided on both the left and right sides of the top surface of the skateboard group 1, so that the skateboard group 1 can be better slidably connected with the top plate 3, thereby improving the stability of the skateboard group 1 during movement.

[0034] As a preferred embodiment, multiple groups of the skateboard assemblies 11 are arranged in sequence along the first direction on the top plate 3, and each group of skateboard assemblies 11 includes a first skateboard 111 and a second skateboard 112 arranged in sequence along the first direction, and the first skateboard 111 and the second skateboard 112 are extended along the second direction, and the first direction and the second direction are perpendicular to each other on the plane where the top plate 3 is located.

[0035] As a preferred embodiment, the sliding mechanism 2 includes a sliding matching bar 10, a first sliding bar 20 and a second sliding bar 30. The sliding matching bar 10 extends along a first direction and is fixedly arranged on the top plate 3. The first sliding bar 20 and the second sliding bar 30 extend along a first direction on the top plate 3 and are respectively slidably arranged on the left and right sides of the sliding matching bar 10. Multiple groups of first slides 111 of the slide assembly 11 are all connected to the first slide bar 20, and multiple groups of second slides 112 of the slide assembly 11 are all connected to the second slide bar 30.

[0036] As a preferred embodiment, the sliding mating bar 10 is a T-shaped bar 10A, and the first sliding bar 20 and the second sliding bar 30 are respectively the first right-angle bar 20A and the second right-angle bar 30A adapted to the T-shaped bar 10A; or, the sliding mating bar 10 is a first long bar 10B, and the first sliding bar 20 and the second sliding bar 30 are respectively the second long bar I20B and the second long bar II30B adapted to the first long bar 10B.

[0037] The above structure can be applied according to different usage scenarios. For example, in this embodiment, the sliding matching strip 10 of the sliding mechanism 2 on the bottom surface of the slide plate group 1 can be a T-shaped strip 10A, and the first sliding strip 20 and the second sliding strip 30 of the sliding mechanism 2 on the bottom surface of the slide plate group 1 are respectively the first right-angle strip 20A and the second right-angle strip 30A matched with the T-shaped strip 10A, so that the sliding mechanism 2 on the bottom surface of the slide plate group 1 can use the T-shaped strip 10A to constrain the first right-angle strip 20A and the second right-angle strip 30A, so that the slide plate group 1 can be more stably slidably installed on the top plate 3. The sliding matching strip 10 of the sliding mechanism 2 on the top surface of the slide plate group 1 is a first long strip 10B, and the first sliding strip 20 and the second sliding strip 30 of the sliding mechanism 2 on the top surface of the slide plate group 1 are respectively the second long strip I20B and the second long strip II30B matched with the first long strip 10B, with low friction, ensuring that the sliding mechanism 2 on the top surface of the slide plate group 1 can move smoothly during operation.

[0038] As a preferred embodiment, at least one first half-mold lip 1111 is sequentially arranged on the first slide 111 along the second direction, and a second half-mold lip 1121 corresponding to the first half-mold lip 1111 is arranged on the second slide 112; when the first sliding bar 20 and the second sliding bar 30 are linked, the first sliding bar 20 and the second sliding bar 30 slide in opposite directions, thereby linking the first slide 111 and the second slide 112 to slide toward or away from each other; when the first slide 111 and the second slide 112 slide toward each other until they contact, the first half-mold lip 1111 and the corresponding second half-mold lip 1121 are combined to form a mold lip; when the first slide 111 and the second slide 112 slide away from each other, the first slide 111 and the second slide 112 are separated to facilitate the mating or release of the mold lip and other parts of the mold.

[0039] Furthermore, the plane between the sliding mating strip 10 and the first sliding strip 20 is a sliding mating surface Ⅰ40, and the plane between the sliding mating strip 10 and the second sliding strip 30 is a sliding mating surface Ⅱ50. For the sliding mechanism 2 arranged on the top surface of the slide plate group 1, the projections of the first half-mold lip 1111 and the second half-mold lip 1121 along the second direction fall on the sliding mating surface Ⅰ40 and the sliding mating surface Ⅱ50, so that the torque effect of the first half-mold lip 1111 and the second half-mold lip 1121 on the sliding mechanism 2 arranged on the bottom surface of the slide plate group 1 can be greatly reduced, thereby reducing the loss of the sliding mechanism 2 arranged on the bottom surface of the slide plate group 1; at the same time, the sliding mating surface Ⅱ50 of the sliding mechanism 2 on the top surface of the slide plate group 1 is conducive to offsetting the torque effect brought by the center of gravity position of the mold lip, further reducing the loss of the sliding mechanism 2 on the bottom surface of the slide plate group 1, achieving the purpose of reducing the defects of the bottle blank product and effectively ensuring the quality of the bottle blank product.

[0040] As a preferred embodiment, the top plate assembly also includes a first wear-resistant plate 32, which is arranged between the bottom surface of the slide plate group 1 and the top surface of the top plate 3, and is fixed on the top surface of the top plate 3. The first wear-resistant plate 32 is slidably matched with the first slide plate 111 and the second slide plate 112, so that the first wear-resistant plate 32 can play a role of sliding support for the first slide plate 111 and the second slide plate 112, thereby improving the sliding stability of the first slide plate 111 and the second slide plate 112; in this embodiment, the first wear-resistant plate 32 is between the two sliding mechanisms 2 on the bottom surface of the slide plate group 1, thereby slidably supporting the middle part of the first slide plate 111 and the second slide plate 112, thereby reducing the probability of bending of the middle part of the first slide plate 111 and the second slide plate 112.

[0041] As a preferred embodiment, a mounting groove 31 is provided on the top surface of the top plate 3, and the sliding mechanism 2 on the bottom surface of the slide plate group 1 is arranged in the mounting groove 31; wherein, the sliding matching bar 10 is fixedly arranged in the mounting groove 31 along a first direction, and the first sliding bar 20 and the second sliding bar 30 are slidingly arranged in the mounting groove 31 along the first direction, and are respectively slidably matched with the left and right sides of the sliding matching bar 10.

[0042] Furthermore, there are two mounting grooves 31, which are respectively located on the left and right sides of the top surface of the top plate 3, and the sliding mechanisms 2 on the left and right sides of the bottom surface of the slide plate group 1 are respectively arranged in the two mounting grooves 31. By mounting the sliding mechanism 2 on the bottom surface of the slide plate group 1 through the mounting grooves 31, the protrusion of the sliding mechanism 2 on the bottom surface of the slide plate group 1 can be reduced, and the distance between the slide plate group 1 and the top plate 3 can be shortened, thereby reducing the size of the entire mold.

[0043] As a preferred embodiment, the top surface of the top plate 3 is provided with a contour block 33, and the contour block 33 is connected with a pressing block 34 parallel to the top plate 3, and the sliding mechanism 2 on the top surface of the slide plate group 1 is arranged between the top surface of the slide plate group 1 and the bottom surface of the pressing block 34;

[0044] Among them, the sliding matching bar 10 is fixedly arranged on the bottom surface of the pressing block 34 along the first direction, so that the sliding matching bar 10 of the sliding mechanism 2 on the top surface of the slide group 1 is fixed and cannot slide; the first sliding bar 20 and the second sliding bar 30 are slidingly arranged between the top surface of the slide group 1 and the bottom surface of the pressing block 34 along the first direction, and are slidingly matched with the left and right sides of the sliding matching bar 10 respectively.

[0045] Furthermore, there are two pressing blocks 34, namely, a first pressing block 341 and a second pressing block 342. The four corners of the top surface of the top plate 3 are provided with equal height blocks 33. The equal height blocks 33 at the left front and left rear of the top surface of the top plate 3 are connected with the first pressing block 341 extending in the first direction. The equal height blocks 33 at the right front and right rear of the top surface of the top plate 3 are connected with the second pressing block 342 extending in the first direction. The sliding mechanism 2 at the left side of the top surface of the slide plate group 1 is arranged between the top surface of the slide plate group 1 and the bottom surface of the first pressing block 341. The sliding mechanism 2 at the right side of the top surface of the slide plate group 1 is arranged between the top surface of the slide plate group 1 and the bottom surface of the second pressing block 342. The above structure can improve the installation quality of the first pressing block 341 and the second pressing block 342, so that the first pressing block 341 and the second pressing block 342 can be stably connected to the corresponding sliding matching strip 10.

[0046] As a preferred embodiment, the top plate assembly also includes a second wear-resistant plate and a third wear-resistant plate 35, wherein the second wear-resistant plate is respectively arranged between the first sliding bar 20 and the mounting groove 31, and between the second sliding bar 30 and the mounting groove 31; the third wear-resistant plate 35 is respectively arranged between the first sliding bar 20 and the pressure block 34, and between the second sliding bar 30 and the pressure block 34, and the third wear-resistant plate 35 is fixed on the pressure block 34, and the third wear-resistant plate 35 is slidably matched with the corresponding first sliding bar 20 and the second sliding bar 30. It should be particularly noted that the second wear-resistant plate is an optional setting, so it is not shown in the figure. In addition, the first wear-resistant plate 32, the second wear-resistant plate and the third wear-resistant plate 35 can be made of wear-resistant mold steel.

[0047] The above description is only a preferred embodiment of the present invention. Any technical solution that achieves the purpose of the present invention by substantially the same means shall fall within the protection scope of the present invention.

Claims

1. A top plate assembly, comprising a top plate, on which a slide plate group is arranged, wherein the slide plate group comprises a plurality of slide plate groups, characterized in that: The bottom surface and the top surface of the slide plate group are respectively provided with sliding mechanisms, and the sliding mechanisms link multiple groups of the slide plate components and enable the multiple groups of the slide plate components to slide on the top plate.

2. The top plate assembly according to claim 1, characterized in that The sliding mechanism is disposed on both left and right sides of the bottom surface of the slide plate group, and / or the sliding mechanism is disposed on both left and right sides of the top surface of the slide plate group.

3. The top plate assembly according to claim 1 or 2, characterized in that: Multiple groups of the skateboard assemblies are arranged in sequence along a first direction on the top plate, and each group of skateboard assemblies includes a first skateboard and a second skateboard arranged in sequence along the first direction. The first skateboard and the second skateboard are extended along a second direction, and the first direction and the second direction are perpendicular to each other on the plane where the top plate is located.

4. The top plate assembly according to claim 3, characterized in that The sliding mechanism includes a sliding matching bar, a first sliding bar and a second sliding bar. The sliding matching bar extends along the first direction on the top plate and is fixedly arranged. The first sliding bar and the second sliding bar extend along the first direction on the top plate and are slidably arranged on the left and right sides of the sliding matching bar respectively. The multiple first sliding plates of the multiple groups of the sliding plate assemblies are all connected to the first sliding bar, and the multiple second sliding plates of the multiple groups of the sliding plate assemblies are all connected to the second sliding bar.

5. The top plate assembly according to claim 4, characterized in that The sliding matching bar is a T-shaped bar, and the first sliding bar and the second sliding bar are respectively a first right-angled bar and a second right-angled bar adapted to the T-shaped bar; Alternatively, the sliding matching bar is a first elongated bar, and the first sliding bar and the second sliding bar are respectively a second elongated bar I and a second elongated bar II adapted to the first elongated bar.

6. The top plate assembly according to claim 4, characterized in that At least one first half-mold lip is arranged on the first slide in sequence along the second direction, and a second half-mold lip corresponding to the first half-mold lip is arranged on the second slide. The plane between the sliding matching strip and the first sliding strip is the sliding matching surface I, and the plane between the sliding matching strip and the second sliding strip is the sliding matching surface II. For the sliding mechanism arranged on the top surface of the slide group, the projections of the first half-mold lip and the second half-mold lip along the second direction fall on their sliding matching surfaces I and sliding matching surfaces II.

7. The top plate assembly according to claim 4, characterized in that The top surface of the top plate is provided with a mounting groove, and the sliding mechanism on the bottom surface of the slide plate group is arranged in the mounting groove; The sliding fit bar is fixedly disposed in the installation groove along the first direction, and the first sliding bar and the second sliding bar are slidingly disposed in the installation groove along the first direction and are slidingly fitted with the left and right sides of the sliding fit bar respectively.

8. The top plate assembly according to claim 7, characterized in that The top surface of the top plate is provided with a block of equal height, the block of equal height is connected with a pressing block parallel to the top plate, and the sliding mechanism on the top surface of the slide plate group is arranged between the top surface of the slide plate group and the bottom surface of the pressing block; Among them, the sliding matching bar is fixedly arranged on the bottom surface of the pressing block along the first direction, and the first sliding bar and the second sliding bar are slidingly arranged between the top surface of the slide plate group and the bottom surface of the pressing block along the first direction, and are slidingly matched with the left and right sides of the sliding matching bar respectively.

9. The top plate assembly according to claim 8, characterized in that The top plate assembly also includes a second wear-resistant plate and a third wear-resistant plate, the second wear-resistant plate is respectively arranged between the first sliding bar and the mounting groove, and the second sliding bar and the mounting groove, and the third wear-resistant plate is respectively arranged between the first sliding bar and the pressure block, and the second sliding bar and the pressure block.

10. The top plate assembly according to claim 1 or 2, characterized in that: The top plate assembly further includes a first wear-resistant plate, which is disposed between the bottom surface of the slide plate assembly and the top surface of the top plate.