Modular quick change mold frame

Abstract

The application discloses a kind of modularization quick change mould frame, belong to mould frame technical field, including lower bottom plate, general base plate, positioning plate, first adjusting bolt and second locking bolt.The lower bottom plate is provided with triangular positioning block, slot and first threaded hole;General base plate is detachably installed on lower bottom plate, it is opened with triangular positioning groove and slot hole on it Cooperation with triangular positioning block;Positioning plate is inserted into slot;First adjusting bolt is threadedly connected on positioning plate, and its end portion is laterally clamped general base plate so that general base plate is tightly attached to triangular positioning block to realize pre-locking;Second locking bolt is locked in first threaded hole through slot hole to realize final locking.Through the cooperation of the V-shaped slope of triangular positioning block and triangular positioning groove, automatic centering and anti-rotation are realized, and the positioning accuracy is ensured by the step-by-step locking of the pre-locking of the first adjusting bolt and the final locking of the second locking bolt. When changing, you only need to remove the general base plate and replace it, which is efficient and has high positioning accuracy.

Description

Technical Field

[0001] This invention relates to the field of mold frame technology, and in particular to a modular quick-change mold frame. Background Technology

[0002] A mold base is the basic support structure for molds and tooling, and is widely used in production fields such as stamping, injection molding, and die casting. During the production process, different specifications of products require different tooling (molds or fixtures), and the tooling needs to be installed on the mold base to carry out production operations.

[0003] In existing technology, tooling is typically mounted directly on the lower base plate of the mold frame. When a product model needs to be changed, the operator must remove the entire mold frame (including the lower base plate and its guiding mechanisms, etc.) from the equipment workbench and replace it with another mold frame adapted to the new tooling. This changeover method has the following drawbacks: First, the entire mold frame is large and heavy, and disassembly and transportation are time-consuming and labor-intensive, resulting in long equipment downtime and low production efficiency.

[0004] Secondly, each product specification requires a complete set of dedicated molds, which involves a large number of molds, a large floor space, and high warehousing costs.

[0005] To address the aforementioned issues, existing technologies have several designs for universal base plates or quick-change mold frames. For example, Chinese patent CN207308899U discloses a universal casting mold base plate. This plate features transverse and longitudinal grooves and positioning holes, using positioning pins for mold positioning, and bolts that pass through the grooves and holes and are screwed into the mold's threaded holes for locking. While this solution achieves a degree of universality for the base plate, the positioning method, relying on cylindrical pins and positioning holes, has limited repeatability and requires multiple pins to prevent rotation.

[0006] Therefore, there is a need to provide a modular mold frame structure with high positioning accuracy and high changeover efficiency. Summary of the Invention

[0007] The purpose of this invention is to provide a modular quick-change mold base to solve the problem of low changeover efficiency in the prior art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: A modular quick-change mold frame includes a lower base plate, a universal base plate, a positioning plate, a first adjusting bolt, and a second locking bolt.

[0009] The lower base plate is fixedly installed on the equipment workbench. The lower base plate is provided with a triangular positioning block, a slot, and a first threaded hole. A universal base plate is detachably installed on the lower base plate. The universal base plate has a triangular positioning groove that mates with the triangular positioning block, and also has a slot hole. The positioning plate is inserted into the slot of the lower base plate. The first adjusting bolt is threaded onto the positioning plate, and its end is used to laterally tighten the universal base plate, making it tightly adhere to the triangular positioning block. The second locking bolt passes through the slot hole on the universal base plate and locks into the first threaded hole of the lower base plate.

[0010] Furthermore, the triangular positioning block is a wedge-shaped block with two intersecting inclined surfaces on the side facing the general base plate, and the included angle between the two inclined surfaces is less than 180 degrees; the cross-sectional shape of the triangular positioning groove matches the cross-sectional shape of the triangular positioning block, and the two sidewalls of the triangular positioning groove fit into the two inclined surfaces of the triangular positioning block.

[0011] Furthermore, the universal base plate is provided with a receiving groove for accommodating the positioning plate and the first adjusting bolt, with the end of the first adjusting bolt pressing against one side wall of the receiving groove.

[0012] Furthermore, the positioning plate has a threaded through hole, through which the first adjusting bolt passes and is threadedly connected to the positioning plate.

[0013] Furthermore, the slots on the universal base plate are oblong or oval, and the length direction of the slots is adapted to the guiding direction of the triangular positioning block.

[0014] Furthermore, the general base plate is also provided with a central positioning hole and at least one second threaded hole; the mold frame also includes a first positioning component for positioning the product to be processed. The first positioning component is provided with a positioning shaft and a first countersunk hole. The positioning shaft is inserted into the central positioning hole, and the first countersunk hole corresponds to the second threaded hole. It is installed in the first countersunk hole and the second threaded hole by a third locking bolt for fixing the first positioning component.

[0015] Furthermore, the universal base plate is also provided with at least two third threaded holes; the mold frame also includes a second positioning component, which is used to cooperate with the first positioning component to position the product to be processed. The second positioning component is provided with a through slot, which corresponds one-to-one with the third threaded hole. It is installed in the slot and the third threaded hole by a fourth locking bolt to fix the second positioning component.

[0016] Furthermore, the mold frame also includes a first guide post, a first upper top plate, and a mounting sleeve. At least two sets of first guide posts are configured, each longitudinally mounted on the lower base plate. The first upper top plate is arranged parallel above the lower base plate, and has a first guide groove corresponding to and slidingly engaging with each of the first guide posts. The mounting sleeve is mounted on the lower end of the first upper top plate, and its side is provided with a first set screw hole. A first pressure head is inserted into the mounting sleeve and fixed by pressure from the side of the set screw.

[0017] Furthermore, the mold base also includes a second guide post, a second upper top plate, a connecting shaft, a second pressure head, a lower limit post, and an upper limit post. At least two sets of second guide posts are configured, each longitudinally mounted on the lower base plate. The second upper top plate is arranged parallel to the lower base plate and has second guide grooves that correspond one-to-one with and slide in fit with the second guide posts. The connecting shaft is mounted on the lower end of the second upper top plate, and its circumferential surface has an annular groove. The top of the second pressure head has an insertion hole and a second set screw hole extending from the side of the second pressure head into the insertion hole. The connecting shaft is inserted into the insertion hole of the second pressure head and fixed by being mounted in the second set screw hole and abutting against the annular groove. The lower limit post is mounted on the lower base plate, and a limit sleeve is detachably mounted on the top of the lower limit post. The upper limit post is mounted on the second upper top plate and corresponds one-to-one with the lower limit post.

[0018] The above-described at least one technical solution adopted in the embodiments of the present invention can achieve the following beneficial effects: Firstly, the two inclined surfaces of the triangular positioning groove and the two inclined surfaces of the triangular positioning block form a V-shaped guide structure in the horizontal direction. When the universal base plate is placed on the lower base plate, even if there is a certain deviation in the initial position, under the action of a slight external force, the inclined surfaces of the triangular positioning groove will guide the universal base plate to automatically slide to the correct position, achieving automatic centering, and the rotational freedom of the universal base plate in the horizontal plane is completely constrained.

[0019] Secondly, the first adjusting bolt's side pre-locking and the second locking bolt's vertical final locking form a step-by-step locking mechanism. The pre-locking ensures the universal base plate is firmly against the triangular positioning block before final locking, therefore the tightening force of the final locking bolt will not cause displacement of the universal base plate, and the positioning accuracy is unaffected by the final locking process. The first adjusting bolt provides lateral pre-locking, and the second locking bolt provides vertical final locking; the locking forces in the two directions are perpendicular to each other. Combined with the aforementioned automatic centering, positioning is convenient and highly accurate.

[0020] Third, the lower base plate is fixedly installed on the equipment workbench as a permanent foundation component, and tooling of different specifications is pre-installed on a universal base plate. When changing models, simply loosen the first adjusting bolt and the second locking bolt, remove the current universal base plate along with the tooling on it, and install another universal base plate with pre-installed tooling on the lower base plate. Attached Figure Description

[0021] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the structure in Embodiment 1 of the present invention, in which a first positioning component and a second positioning component are installed on a general base plate.

[0022] Figure 2 This is an exploded view of the general base plate and the first positioning component.

[0023] Figure 3 It is a mating structure consisting of a triangular positioning block, a general base plate, and a first adjusting bolt.

[0024] Figure 4 This is an exploded view of the triangular positioning block, the general base plate, the lower base plate, the positioning plate, and the first adjusting bolt.

[0025] Figure 5 This is a schematic diagram of the structure in Embodiment 2 of the present invention, in which the first positioning element and the second positioning element are installed on the general base plate.

[0026] Figure 6 This is a schematic diagram of the structure of Embodiment 2 of the present invention.

[0027] Figure 7 This is a three-dimensional structural cross-sectional view of Embodiment 2 of the present invention.

[0028] Figure 8 This is a schematic diagram of the structure of Embodiment 3 of the present invention.

[0029] Figure 9 This is a three-dimensional structural cross-sectional view of Embodiment 3 of the present invention.

[0030] Figure Labels Bottom plate, 11-triangular positioning block, 111-sloping surface, 12-slot, 13-first threaded hole; General base plate, 21-triangular positioning groove, 22-slot hole, 23-accommodating groove, 24-center positioning hole, 25-second threaded hole, 26-third threaded hole; 3-Positioning plate, 31-Threaded through hole; 4-First adjusting bolt; 6-First positioning component, 61-Positioning shaft, 62-First countersunk hole; 7-Second positioning component, 71-Slot; 81-First guide post, 82-First upper top plate, 821-First guide groove, 83-Mounting sleeve, 831-First set screw hole, 84-First pressure head; 91-Second guide post, 92-Second upper top plate, 921-Second guide groove, 93-Connecting shaft, 931-Annular groove, 94-Second pressure head, 941-Insertion hole, 942-Second set screw hole, 95-Lower limit post, 951-Limit sleeve, 96-Upper limit post. Detailed Implementation

[0031] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0032] The technical solutions provided by the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0033] Example 1 like Figures 1 to 4 As shown, this embodiment provides a modular quick-change mold frame, which is suitable for small mold frame scenarios. It includes a lower base plate 1, a universal base plate 2, a positioning plate 3, a first adjusting bolt 4, a second locking bolt, a first positioning component 6, and a second positioning component 7.

[0034] The lower base plate 1 is a rectangular plate structure, fixedly installed on the equipment workbench. A triangular positioning block 11 (generally fixed by bolts) is provided on the upper surface of the lower base plate 1. The triangular positioning block 11 is a wedge-shaped block with two intersecting inclined surfaces 111 on the side facing the universal base plate 2. The included angle between the two inclined surfaces 111 is 90 degrees. The height of the triangular positioning block 11 is slightly lower than the height of the universal base plate 2 to avoid interference when installing tooling on the universal base plate. A slot 12, a rectangular groove, is also provided on the lower base plate 1, located at one edge of the lower base plate 1. Several first threaded holes 13 are also provided on the lower base plate 1 for engaging with second locking bolts to achieve final locking.

[0035] The universal base plate 2 is a rectangular plate structure, detachably mounted on top of the lower base plate 1. A triangular positioning groove 21 is formed on the universal base plate 2, the cross-sectional shape of which matches the cross-sectional shape of the triangular positioning block 11, and the two sidewalls of the triangular positioning groove 21 are in contact with the two inclined surfaces 111 of the triangular positioning block 11. Several slots 22 are also formed on the universal base plate 2; these slots 22 are oblong holes, their length direction matching the guiding direction of the triangular positioning block 11. A receiving groove 23 is formed on the universal base plate 2 to receive the positioning plate 3 and the first adjusting bolt 4. The universal base plate 2 also has a central positioning hole 24, at least one second threaded hole 25, and at least two third threaded holes 26.

[0036] The positioning plate 3 is a rectangular plate structure that inserts into the slot 12 of the lower base plate 1. The thickness of the positioning plate 3 matches the width of the slot 12 to ensure that the positioning plate 3 will not wobble after insertion. A threaded through hole 31 is provided on the positioning plate 3.

[0037] The first adjusting bolt 4 passes through the threaded through hole 31 on the positioning plate 3 and is threadedly connected to the positioning plate 3. The end of the first adjusting bolt 4 faces one side wall of the receiving groove 23 of the universal base plate 2. When the first adjusting bolt 4 is screwed on, its end presses against the side wall of the receiving groove 23, forcing the universal base plate 2 to fit tightly against the triangular positioning block 11, thus achieving pre-locking.

[0038] The second locking bolt passes through the slot 22 on the general base plate 2 and is locked in the first threaded hole 13 of the lower base plate 1, thus achieving final fixing and locking.

[0039] The first positioning component 6 is used to position the product to be processed (actually a fan blade). The first positioning component 6 is provided with a positioning shaft 61 and a first countersunk hole 62. The positioning shaft 61 is inserted into the center positioning hole 24 of the general base plate 2. The first countersunk hole 62 corresponds to the second threaded hole 25. The first positioning component 6 is installed in the first countersunk hole 62 and the second threaded hole 25 by a third locking bolt for fixing the first positioning component 6.

[0040] The second positioning component 7 is used to position the product to be processed (actually a rotor) in conjunction with the first positioning component 6. The second positioning component 7 has a through-hole 71, which corresponds one-to-one with the third threaded hole 26. It is installed in the slot 71 and the third threaded hole 26 by a fourth locking bolt to fix the second positioning component 7. A button magnet (not shown in the figure) is installed on the second positioning component 7, and the rotor is magnetically attached to the second positioning component 7. The fan blades and rotor are arranged coaxially after installation.

[0041] In this embodiment, the press head can be directly connected to the press to perform the pressing operation, which is suitable for small mold frame scenarios.

[0042] The workflow of this embodiment is as follows: During installation, first, fix the lower base plate 1 onto the equipment workbench. Then, place the universal base plate 2 on the lower base plate 1, aligning the triangular positioning groove 21 on the universal base plate 2 with the triangular positioning block 11 on the lower base plate 1, achieving automatic centering and positioning under the guidance of the V-shaped inclined surface. Next, insert the positioning plate 3 into the slot 12 of the lower base plate 1, and tighten the first adjusting bolt 4 so that its end is laterally pressed against the side wall of the receiving groove 23 of the universal base plate 2, making the universal base plate 2 tightly against the triangular positioning block 11, completing the pre-locking. Finally, pass the second locking bolt through the slot 22 on the universal base plate 2 and lock it into the first threaded hole 13 of the lower base plate 1, completing the final locking.

[0043] Insert the positioning shaft 61 of the first positioning component 6 into the center positioning hole 24 of the universal base plate 2 and fix it with the third locking bolt. Install the second positioning component 7 onto the universal base plate 2 with the fourth locking bolt. Position the fan blade onto the first positioning component 6, and attach the rotor to the arc-shaped surface of the second positioning component 7 with a magnet to perform the pressing operation. This embodiment is suitable for the production of small mold frames, where the press head is directly connected to the press and the product is pressed.

[0044] When changing the type, loosen the second locking bolt and the first adjusting bolt 4 in sequence, take out the positioning plate 3, remove the current general base plate 2 together with the first positioning part 6 and the second positioning part 7 on it from the lower base plate 1, and then install another set of pre-installed tooling general base plate 2 on the lower base plate 1, and complete the triangular positioning, pre-locking and final locking in sequence.

[0045] Example 2 like Figures 5-7 As shown, the structure of this embodiment is basically the same as that of Embodiment 1, the difference being that this embodiment is applicable to medium mold frame scenarios. In this embodiment, the modular quick-change mold frame also includes a first guide post 81, a first upper top plate 82, and a mounting sleeve 83.

[0046] The first guide post 81 is configured in at least two sets, both of which are longitudinally mounted on the lower base plate 1.

[0047] The first upper top plate 82 is arranged parallel above the lower bottom plate 1, and the first upper top plate 82 has a first guide groove 821 that corresponds one-to-one with the first guide post 81 and is slidably engaged. A flange connection seat (not shown in the figure) is installed at the upper end of the first upper top plate 82 for connecting the press.

[0048] The mounting sleeve 83 is installed at the lower end of the first upper top plate 82. A first set screw hole 831 is provided on its side. The first pressure head 84 is inserted into the mounting sleeve 83 and fixed by pressing against the side of the set screw.

[0049] In this embodiment, the press drives the first upper top plate 82 to move up and down along the first guide column 81 through the flange connection seat, thereby driving the first press head 84 to perform pressing operations, which is suitable for medium mold frame scenarios.

[0050] Example 3 like Figures 8-9 As shown, the structure of this embodiment is basically the same as that of Embodiment 1, the difference being that this embodiment is applicable to large mold frame scenarios. In this embodiment, the modular quick-change mold frame also includes a second guide post 91, a second upper top plate 92, a connecting shaft 93, a second pressure head 94, a lower limit post 95, and an upper limit post 96.

[0051] The second guide post 91 is configured in at least two sets, both of which are longitudinally mounted on the lower base plate 1.

[0052] The second upper top plate 92 is arranged parallel to the lower bottom plate 1 above it, and the second upper top plate 92 has a second guide groove 921 that corresponds one-to-one with the second guide post 91 and is slidably engaged. A flange connection seat (not shown in the figure) is installed at the upper end of the second upper top plate 92 for connecting the press.

[0053] The connecting shaft 93 is installed at the lower end of the second upper top plate 92, and its circumferential surface is provided with an annular groove 931.

[0054] The top of the second pressure head 94 has an insertion hole 941 and a second set screw hole 942 that extends from the side of the second pressure head 94 into the insertion hole 941. The connecting shaft 93 is inserted into the insertion hole 941 of the second pressure head 94 and is fixed by being installed in the second set screw hole 942 and abutting against the annular groove 931.

[0055] The lower limit post 95 is installed on the lower base plate 1, and the top of the lower limit post 95 is detachably installed with a limit sleeve 951. The limit sleeve 951 is also fixed with a set screw. In actual production, the limit sleeve generally has multiple height models. According to different products, the corresponding model is changed to adjust the downward stroke of the second upper top plate 92.

[0056] The upper limit post 96 is installed on the second upper top plate 92 and corresponds one-to-one with the lower limit post 95. The upper limit post 96 and the lower limit post 95 cooperate to limit the downward stroke of the second upper top plate 92.

[0057] In this embodiment, the press drives the second upper top plate 92 to move up and down along the second guide column 91 through the flange connection seat, thereby driving the second press head 94 to perform press-fitting operations, which is suitable for large mold frame scenarios.

[0058] In summary, all three embodiments described above utilize a three-layer architecture consisting of a lower base plate, a universal base plate, and tooling, resulting in a significant rapid changeover capability. The lower base plate is fixedly installed on the equipment's workbench as a permanent foundation, while tooling of different specifications is pre-installed on a universal base plate. During changeover, simply loosen the first adjusting bolt and the second locking bolt, remove the current universal base plate along with its tooling, and install another universal base plate with pre-installed tooling onto the lower base plate.

[0059] The first embodiment (small mold frame) can be used by directly connecting the press head to the press, with a simple and compact structure. The second embodiment (medium mold frame) connects to the press via a flange connection seat at the top of the first upper plate, adapting to the pressing requirements of medium-sized products. The third embodiment (large mold frame) connects to the press via a flange connection seat at the top of the second upper plate, adapting to the pressing requirements of large-sized products. All three embodiments share the same lower base plate and universal base plate positioning structure, achieving full coverage from small to large sizes, demonstrating the flexibility and versatility of modular design. This universal base plate is not limited to the above three embodiments and can also be adapted to other processing scenarios.

[0060] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A modular quick-change mold base, characterized in that, include: The lower base plate (1) is provided with a triangular positioning block (11), a slot (12) and a first threaded hole (13). A universal base plate (2) is detachably installed on the lower base plate (1). The universal base plate (2) has a triangular positioning groove (21) that cooperates with the triangular positioning block (11). The universal base plate (2) also has a slot (22). The positioning plate (3) is inserted into the slot (12); The first adjusting bolt (4) is threaded onto the positioning plate (3). The end of the first adjusting bolt is used to laterally press against the universal base plate (2) so that the universal base plate (2) is in close contact with the triangular positioning block (11). The second locking bolt passes through the slot (22) on the general base plate (2) and is locked in the first threaded hole (13) of the lower base plate (1).

2. The modular quick-change mold frame according to claim 1, characterized in that, The triangular positioning block (11) is a wedge-shaped block with two intersecting inclined surfaces (111) on the side facing the universal base plate (2), and the included angle between the two inclined surfaces (111) is less than 180 degrees.

3. The modular quick-change mold frame according to claim 2, characterized in that, The cross-sectional shape of the triangular positioning groove (21) matches the cross-sectional shape of the triangular positioning block (11), and the two side walls of the triangular positioning groove (21) fit into the two inclined surfaces (111) of the triangular positioning block (11).

4. The modular quick-change mold frame according to claim 1, characterized in that, The universal base plate (2) has a receiving groove (23) for accommodating the positioning plate (3) and the first adjusting bolt, with the end of the first adjusting bolt pressing against one side wall of the receiving groove (23).

5. The modular quick-change mold frame according to claim 1, characterized in that, The positioning plate (3) has a threaded through hole (31), and the first adjusting bolt (4) passes through the threaded through hole (31) and is threadedly connected to the positioning plate (3).

6. The modular quick-change mold frame according to claim 1, characterized in that, The slot (22) on the general base plate (2) is a waist-shaped hole or an oblong hole, and the length direction of the slot (22) is adapted to the guiding direction of the triangular positioning block (11).

7. The modular quick-change mold frame according to claim 1, characterized in that, The universal base plate (2) is also provided with a central positioning hole (24) and at least one second threaded hole (25); the modular quick-change mold frame also includes: The first positioning component (6) is used to position the product to be processed (100). The first positioning component (6) is provided with a positioning shaft (61) and a first countersunk hole (62). The positioning shaft (61) is inserted into the center positioning hole (24), and the first countersunk hole (62) corresponds to the second threaded hole (25). The first positioning component (6) is installed in the first countersunk hole (62) and the second threaded hole (25) by a third locking bolt to fix the first positioning component (6).

8. The modular quick-change mold frame according to claim 6, characterized in that, The universal base plate (2) is also provided with at least two third threaded holes (26); the modular quick-change mold frame also includes: The second positioning component (7) is used to cooperate with the first positioning component (6) to position the product two (200) to be processed. The second positioning component (7) has a through groove (71) that is provided. The groove (71) corresponds one-to-one with the third threaded hole (26) and is installed in the groove (71) and the third threaded hole (26) by the fourth locking bolt to fix the second positioning component (7).

9. The modular quick-change mold frame according to claim 1, characterized in that, The modular quick-change mold frame also includes: The first guide post (81) is configured with at least two sets, both of which are longitudinally installed on the lower base plate (1); The first upper top plate (82) is arranged parallel above the lower bottom plate (1), and the first upper top plate (82) has a first guide groove (821) that corresponds to and slides with the first guide post (81). The mounting sleeve (83) is installed at the lower end of the first upper top plate (82), and a first set screw hole (831) is provided on its side. The first pressure head (84) is inserted into the mounting sleeve (83) and fixed by pressing against the side of the set screw.

10. The modular quick-change mold frame according to claim 1, characterized in that, The modular quick-change mold frame also includes: The second guide column (91) is configured with at least two sets, all of which are longitudinally installed on the lower base plate (1); The second upper top plate (92) is arranged parallel above the lower bottom plate (1), and the second upper top plate (92) has a second guide groove (921) that corresponds to and slides with the second guide post (91). A connecting shaft (93) is installed at the lower end of the second upper top plate (92), and its circumferential surface is provided with an annular groove (931). The second pressure head (94) has an insertion hole (941) at the top and a second set screw hole (942) extending from the side of the second pressure head (94) into the insertion hole (941). The connecting shaft (93) is inserted into the insertion hole (941) of the second pressure head (94) and fixed by being installed in the second set screw hole (942) and abutting against the annular groove (931). The lower limit post (95) is installed on the lower base plate (1), and the top of the lower limit post (95) is detachably fitted with a limit sleeve (951). The upper limit post (96) is installed on the second upper top plate (92) and corresponds one-to-one with the lower limit post (95).

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