Fixing support for constructional engineering formwork

Abstract

The utility model belongs to the technical field of formwork fixing equipment, and particularly relates to a fixing support for a constructional engineering formwork, which comprises a base, a fixing plate mounted on the base and a connecting mechanism mounted between the base and the fixing plate, an adjusting mechanism is mounted on the connecting mechanism, bolts are arranged at four corners of the base, and the adjusting mechanism is mounted on the base. The surface of the base is provided with moving holes matched with the plug pins, the plug pins are inserted into the moving holes formed in the base, and the base is provided with a dismounting assembly. The dismounting assembly comprises a sliding rail fixed to the outer surface of the base, a moving block connected to the surface of the sliding rail in a sliding mode and a locking rod connected to the interior of the moving block in a sliding mode. The disassembly is prevented from being hindered due to forgetting or losing of tools, the operation is simpler and more convenient, the use effect of the device is improved, and the actual use requirement is met.

Description

Technical Field

[0001] The utility model belongs to the technical field of template fixing equipment, and in particular relates to a fixing bracket for a construction engineering template. Background Art

[0002] Formwork engineering refers to the formwork for newly poured concrete and a complete set of structural systems that support the formwork. Among them, the structural part that contacts the concrete and controls the predetermined size, shape, and position is called the formwork. The rods, trusses, connectors, metal accessories, working bridges, etc. that support and fix the formwork constitute the supporting system. For sliding formwork and self-lifting formwork, lifting power, lifting frames, platforms, etc. are added. Formwork engineering is a temporary structure in concrete construction. In the construction of building projects, the formwork needs to be supported;

[0003] After checking the publication (announcement) number; CN217175748U discloses a fixed bracket for construction engineering formwork. This technology discloses "a vertical rod is fixedly provided on the bottom plate, a support plate is hinged at the end of the vertical rod, a protractor is installed on the vertical rod, and the protractor is concentric with the hinge axis of the support plate, a pointer is fixed on the hinge axis of the support plate, a shell is hinged on the vertical rod, and a connecting rod hinged to the support plate is movably penetrated in the shell, etc., which facilitates the adjustment of the support angle of the formwork, thereby facilitating the use of the staff and improving the use efficiency of the staff, thereby greatly improving the practicality of the fixed bracket for construction engineering formwork, and facilitating the promotion and use of the equipment and other technical effects".

[0004] When the above design is used, although it is convenient to adjust the support angle of the template, thereby facilitating the use of the staff and improving the use efficiency of the staff, the bottom plate is fixed to the ground by anchor rods. When the device is disassembled, the anchor rods need to be pulled out from the ground, and external professional tools may be required to remove them, which makes disassembly more troublesome and requires professional equipment and tools at all times. Disassembly is easily hindered due to forgetting or losing tools. This operation is more cumbersome, reducing the use effect of the device;

[0005] In order to solve the above problems, the present application proposes a fixing bracket for a construction engineering formwork. Utility Model Content

[0006] To solve the problems raised in the above background technology, the utility model provides a fixing bracket for a construction engineering template, which has the characteristics of not requiring professional tools and equipment to disassemble the pin, avoiding obstacles to disassembly due to forgetting or losing tools, making the operation simpler and more convenient, improving the use effect of the device, and meeting the actual use needs.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a fixing bracket for a construction engineering template, comprising a base, a fixing plate installed on the base, and a connecting mechanism installed between the base and the fixing plate, an adjusting mechanism installed on the connecting mechanism, latches are arranged at the four corners of the base, a movable hole adapted to the latch is opened on the surface of the base, the latch is plugged into the movable hole opened on the base, a disassembly assembly is installed on the base, the disassembly assembly comprises a slide rail fixed to the outer surface of the base, a movable block slidably connected to the surface of the slide rail, and a movable block slidably connected to the movable block An internal locking rod, a socket matched with the locking rod is provided on the surface of the slide rail close to the side of the bolt, a spring 1 is wound around the surface of the locking rod, and the two ends of the spring 1 are respectively fixedly connected to the moving block and the locking rod, a fixing rod is provided on the top of the moving block, a sleeve is sleeved on the surface of the fixing rod, an annular disk is fixed on the top of the surface of the sleeve, a rectangular plate is fixed on the outer bottom of the sleeve, a striking block is slidably connected to the surface of the sleeve, a spring 2 in a stretched state is wound around the surface of the fixing rod, and the two ends of the spring 2 are respectively fixedly connected to the fixing rod and the annular disk, and a gasket is fixed on the surface of the bolt.

[0008] As a preferred fixed bracket for a construction engineering formwork of the utility model, the surface of the moving block is provided with a convex groove matched with the slide rail, and the moving block and the slide rail are slidably connected through the convex groove; the surface of the moving block close to the locking rod is provided with a through hole matched with the locking rod, and the locking rod and the moving block are slidably connected through the through hole; the surface of the striking block is provided with a circular hole matched with the sleeve, and the striking block and the sleeve are slidably connected through the circular hole; the sleeve is slidably connected to the surface of the fixed rod, and the inner side wall of the sleeve is in contact with the outer surface of the fixed rod.

[0009] As a preferred fixing bracket for a construction engineering formwork of the utility model, the diameter of the gasket is smaller than the maximum diameter of the top of the pin and larger than the diameter of the movable hole opened in the base, and the thickness of the gasket is larger than the thickness of the rectangular plate.

[0010] As a preferred fixing bracket for a construction engineering formwork of the utility model, a silicone pad is fixed on the surface of the striking block.

[0011] As a preferred embodiment of the utility model for a fixing bracket for a construction engineering formwork, a mounting groove is provided on the upper surface of the base.

[0012] As a preferred fixed bracket for a construction engineering formwork of the utility model, a storage assembly is installed on the base, and the storage assembly includes a limit groove opened on the upper surface of the base close to the installation groove, a limit hole opened on the surface of the base close to the limit groove, and a limit pin fixed to the lower surface of the annular disk, the limit hole and the limit groove are connected, the limit pin and the limit hole are adapted to each other, a movable groove is opened on the upper surface of the movable block, and a movable block is arranged in the sliding groove, rotating rods are fixed on both sides of the movable block, and one end of the rotating rod is rotatably connected to the movable block through a bearing, and the fixed rod is fixed to the upper surface of the movable block.

[0013] As a preferred embodiment of the utility model for a fixing bracket for a construction engineering formwork, the bottom of the movable block is provided with an arc chamfer, and the two sides of the movable block are respectively fitted with the base and the surface of the movable block.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] By setting up a disassembly component, there is no need to use professional tools and equipment to disassemble the pin, which avoids the obstruction of disassembly due to forgetting or losing the tool. This operation is simpler and more convenient, improves the use effect of the device, and meets actual use needs. In addition, a storage component is added to this mechanism, so that the fixing rod can be folded and stored, which does not take up space and is convenient for later transportation, further improving the use effect of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 It is a structural cross-sectional view of the moving block in the utility model;

[0019] Figure 3 It is a structural schematic diagram of the movement of the annular disk in the utility model;

[0020] Figure 4 It is a schematic diagram of the structure of the latch and gasket connector in the utility model;

[0021] Figure 5 It is a schematic diagram of the structure of the folding fixing rod in the utility model.

[0022] In the figure: 1. base; 2. fixing plate; 3. adjustment mechanism; 4. connecting mechanism; 5. latch; 6. disassembly assembly; 601. slide rail; 602. mounting slot; 603. moving block; 604. locking rod; 605. spring 1; 606. socket; 607. fixing rod; 608. sleeve; 609. annular disk; 610. rectangular plate; 611. silicone pad; 612. striking block; 613. gasket; 614. spring 2; 7. storage assembly; 701. limit slot; 702. limit pin; 703. limit hole; 704. movable block. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] Example 1

[0025] like Figure 1 As shown:

[0026] A fixing bracket for a construction engineering template comprises a base 1, a fixing plate 2 installed on the base 1, and a connecting mechanism 4 installed between the base 1 and the fixing plate 2, an adjusting mechanism 3 is installed on the connecting mechanism 4, latches 5 are arranged at the four corners of the base 1, and movable holes matching the latches 5 are opened on the surface of the base 1, and the latches 5 are inserted into the movable holes opened in the base 1.

[0027] In this embodiment: the existing device {publication (announcement) number}: CN217175748U discloses a fixed bracket for a construction engineering template. The adjustment mechanism 3 and the connecting mechanism 4 in the present application document adopt the same technical means in this prior art. This technical means will not be repeated here one by one. This application makes further improvements on this existing subject. For details, please refer to the disclosed technology below; in order to solve the technical problems existing in this prior art, as disclosed in the background technology above, "the above-mentioned design is convenient for adjusting the support angle of the template when in use, thereby facilitating the use of the staff and improving the use efficiency of the staff, but the bottom plate is fixed to the ground by anchor rods. When the device is disassembled, the anchor rods need to be pulled out of the ground, and external professional tools may need to be used to remove them, so that the disassembly is more troublesome, and professional equipment and tools need to be equipped at all times. The disassembly is easily hindered due to the forgetting or loss of the tools. This operation is more cumbersome and reduces the use effect of the device." In terms of use, this problem is obviously a real problem that exists and is difficult to solve. In view of this, in order to solve this technical problem, a disassembly component 6 and a storage component 7 are added to the present application document.

[0028] It should be noted that the accessories used by the adjustment mechanism 3 and the connecting mechanism 4 have been disclosed by publication number CN217175748U, and their use effects can refer to publication number CN217175748U (that is, the "vertical rod, support rod, sleeve, fixing part, support plate, protractor, pointer, shell, connecting rod, adjustment assembly, rack, gear and adjustment part components" disclosed in this prior art).

[0029] More specifically:

[0030] like Figure 1-Figure 5 As shown:

[0031] A disassembly assembly 6 is installed on the base 1, and the disassembly assembly 6 includes a slide rail 601 fixed on the outer surface of the base 1, a moving block 603 slidably connected to the surface of the slide rail 601, and a locking rod 604 slidably connected to the inside of the moving block 603. A plug hole 606 adapted to the locking rod 604 is opened on the side of the surface of the slide rail 601 close to the latch 5, and a spring 605 is wound around the surface of the locking rod 604. The two ends of the spring 605 are fixedly connected to the moving block 603 and the locking rod 604 respectively. The moving block 601 is fixed to the locking rod 604. A fixing rod 607 is arranged at the top of 03, a sleeve 608 is sleeved on the surface of the fixing rod 607, an annular disk 609 is fixed on the top of the surface of the sleeve 608, a rectangular plate 610 is fixed on the outer bottom of the sleeve 608, a striking block 612 is slidably connected on the surface of the sleeve 608, a spring 614 in a tension state is wound around the surface of the fixing rod 607, and the two ends of the spring 614 are fixedly connected to the fixing rod 607 and the annular disk 609 respectively, and a gasket 613 is fixed on the surface of the latch 5;

[0032] A convex groove matching the slide rail 601 is provided on the surface of the moving block 603, and the moving block 603 and the slide rail 601 are slidably connected through the convex groove. A through hole matching the locking rod 604 is provided on the side of the surface of the moving block 603 close to the locking rod 604, and the locking rod 604 and the moving block 603 are slidably connected through the through hole. A circular hole matching the sleeve 608 is provided on the surface of the striking block 612, and the striking block 612 and the sleeve 608 are slidably connected through the circular hole. The sleeve 608 is slidably connected to the surface of the fixed rod 607, and the inner wall of the sleeve 608 fits the outer surface of the fixed rod 607.

[0033] In this embodiment: the fixed bracket for the construction engineering template, when in use, when the device is disassembled, when the latch 5 is taken out from the ground, the striking block 612 is slid, and the striking block 612 slides on the surface of the sleeve 608. As the striking block 612 moves upward, the annular disk 609 is struck, and the sleeve 608 and the bottom end of the spring 2 614 are driven to move upward by striking the annular disk 609, and the rectangular plate 610 is driven to move upward by the sleeve 608. As the rectangular plate 610 moves upward, The bolt 5 forms an impact to drive the bolt 5 to move up, so that the bolt 5 is pulled out from the ground. Through the setting of the second spring 614, the rebound force of the second spring 614 can drive the annular disk 609 to move up, and the annular disk 609 drives the sleeve 608 and the rectangular plate 610 to move up. At this time, the rectangular plate 610 is always in contact with the top lower surface of the bolt 5, so that the bolt 5 is better pulled out from the ground. After a group of bolts 5 are pulled out, the locking rod 604 is pulled out, thereby causing the locking rod 604 to move out of the socket 606. The spring 1 605 is stretched, and then the moving block 603 is slid to move the moving block 603 to the position of another set of latches 5. Then the locking rod 604 is released, and the spring 1 605 rebounds and the locking rod 604 is inserted into the insertion hole 606 to lock the position of the moving block 603 again. In this process, the annular disk 609 is pressed to stretch the spring 2 614 until the annular disk 609 drives the sleeve 608 and the rectangular plate 610 to move downward. When the moving block 603 moves to When another group of latches 5 are in position, and the rectangular plate 610 is now located in the gap between the latches 5 and the base 1, the annular disk 609 is then struck by the sliding striking block 612, thereby pulling out the latches 5 again. By repeating the above operation, all the latches 5 can be pulled out from the ground. Through this operation, there is no need to use professional tools and equipment to disassemble the latches 5, thereby avoiding obstacles to disassembly due to forgetting or losing tools. This operation is simpler and more convenient, which improves the use effect of the device and meets actual use needs.

[0034] Going further;

[0035] In an optional embodiment, the diameter of the gasket 613 is smaller than the maximum diameter of the top of the latch 5 and larger than the diameter of the movable hole opened in the base 1 , and the thickness of the gasket 613 is greater than the thickness of the rectangular plate 610 .

[0036] In this embodiment, the gasket 613 on the latch 5 creates a certain gap between the top of the latch 5 and the base 1 when the latch 5 is inserted into the ground, so that the rectangular plate 610 can be easily stuck in the gap.

[0037] Going further;

[0038] In an optional embodiment, a silicone pad 611 is fixed to the surface of the striking block 612 .

[0039] In this embodiment, the silicone pad 611 on the striking block 612 can increase the friction force, so that the striking block 612 can be held more stably and the striking block 612 can be prevented from slipping out of the hand.

[0040] Going further;

[0041] In an optional embodiment, a mounting groove 602 is formed on the upper surface of the base 1 .

[0042] In this embodiment: the mounting groove 602 provided on the base 1 does not affect the folding effect of the rear fixing rod 607 , and can support a part of the position of the slide rail 601 , thereby increasing the fixing effect of the slide rail 601 .

[0043] Further,

[0044] In an optional embodiment, a storage assembly 7 is installed on the base 1, and the storage assembly 7 includes a limiting groove 701 opened on the upper surface of the base 1 near the installation groove 602, a limiting hole 703 opened on the surface of the base 1 near the limiting groove 701, and a limiting pin 702 fixed on the lower surface of the annular disk 609, the limiting hole 703 and the limiting groove 701 are connected, the limiting pin 702 and the limiting hole 703 are adapted, a movable groove is opened on the upper surface of the moving block 603, and a movable block 704 is arranged in the sliding groove, rotating rods are fixed on both sides of the movable block 704, and one end of the rotating rod is rotatably connected to the moving block 603 through a bearing, and a fixed rod 607 is fixed on the upper surface of the movable block 704;

[0045] The bottom of the movable block 704 is provided with an arc chamfer, and two sides of the movable block 704 are respectively in contact with the surface of the base 1 and the surface of the moving block 603 .

[0046] In this embodiment, after the latch 5 is completely removed, the movable block 603 is moved to the arc position of the slide rail 601, and the fixed rod 607 is folded, which drives the movable block 704 to make a circular motion until the fixed rod 607 is 90 degrees relative to the movable block 603. At this time, the annular disk 609 is slid on the surface of the fixed rod 607, and the spring 2 614 is compressed by the annular disk 609 until the annular disk 609 moves into the limiting groove 701. At this time, the spring 2 614 rebounds and drives the limiting pin 702 Inserted into the interior of the limiting hole 703, the fixing rod 607 can be folded and stored so as not to take up space, which is convenient for later transportation and further improves the use effect of the device. Since the two sides of the movable block 704 are respectively in contact with the base 1 and the surface of the movable block 603, when the movable block 603 moves to the two sides of the base 1, it can limit the movable block 704 and prevent the movable block 704 from rotating. When the movable block 603 moves to the arc position of the slide rail 601, the movable block 704 can rotate.

[0047] The working principle and use process of the utility model are as follows: the fixed bracket for the construction engineering template is used. When the device is disassembled, when the latch 5 is taken out from the ground, the striking block 612 is slid, and the striking block 612 slides on the surface of the sleeve 608. The silicone pad 611 on the striking block 612 can increase the friction force, so that the striking block 612 is held in the hand more stably, and the striking block 612 is prevented from slipping out of the hand. As the striking block 612 moves upward, the annular disk 609 is struck, and the sleeve 608 and the bottom end of the spring 2 614 are moved upward by striking the annular disk 609, and the rectangular plate 610 is moved upward by the sleeve 608. As the rectangular plate 610 moves upward, the latch 5 is impacted. The latch 5 is driven to move upward, thereby pulling the latch 5 out from the ground. Through the setting of the spring 2 614 and the resilience of the spring 2 614, the annular disk 609 can be driven to move upward, and the sleeve 608 and the rectangular plate 610 are driven to move upward through the annular disk 609. At this time, the rectangular plate 610 is always in contact with the top lower surface of the latch 5, thereby better pulling the latch 5 out from the ground. After one group of latches 5 are pulled out, the locking rod 604 is pulled to move the locking rod 604 out of the insertion hole 606. At this time, the spring 1 605 is driven to stretch, and then the moving block 603 is slid to move the moving block 603 to the position of another group of latches 5. Then the locking rod 604 is released. At this time, the spring 1 605 rebounds and the locking rod 604 is inserted into the The movable block 603 is inserted into the socket 606, and the position of the movable block 603 is locked again. In this process, the annular disk 609 is pressed to stretch the spring 2 614 until the annular disk 609 drives the sleeve 608 and the rectangular plate 610 to move downward. When the movable block 603 moves to another set of latch pins 5 positions, the rectangular plate 610 is located at the gap between the latch pin 5 and the base 1 at this time. Through the gasket 613 on the latch pin 5, when the latch pin 5 is inserted into the ground, a certain gap is generated between the top of the latch pin 5 and the base 1 due to the gasket 613, so that the rectangular plate 610 is convenient to be stuck in this gap. Then, the annular disk 609 is hit by the sliding striking block 612, so that the latch pin 5 is pulled out again. Repeating the above operation can All the latches 5 are pulled out from the ground. Through this operation, there is no need to use professional tools to disassemble the latches 5, so as to avoid the obstruction of disassembly caused by forgetting or losing tools. This operation is simpler and more convenient, which improves the use effect of the device and meets the actual use needs. After the latches 5 are completely taken out, the movable block 603 is moved to the arc position of the slide rail 601, and the fixed rod 607 is folded. At this time, the movable block 704 is driven to make a circular motion until the fixed rod 607 is 90 degrees relative to the movable block 603. At this time, the annular disk 609 is slid on the surface of the fixed rod 607, and the spring 2 614 is compressed by the annular disk 609 until the annular disk 609 moves into the limit groove 701. At this time, the spring 2 614 rebounds.And drive the limiting pin 702 to be inserted into the limiting hole 703, so that the fixing rod 607 can be folded and stored, so as not to occupy space, and it is convenient for later transportation, and the use effect of the device is further improved. Since the two sides of the movable block 704 are respectively in contact with the base 1 and the surface of the movable block 603, when the movable block 603 moves to the two sides of the base 1, it can limit the movable block 704, and it is not easy for the movable block 704 to rotate. When the movable block 603 moves to the arc position of the slide rail 601, the movable block 704 can rotate, and the mounting groove 602 provided on the base 1 does not affect the folding effect of the fixing rod 607, and can also support part of the position of the slide rail 601, thereby increasing the fixing effect of the slide rail 601.

[0048] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A fixing bracket for a construction engineering template, comprising a base (1), a fixing plate (2) mounted on the base (1), and a connecting mechanism (4) mounted between the base (1) and the fixing plate (2), wherein an adjusting mechanism (3) is mounted on the connecting mechanism (4), latches (5) are arranged at four corners of the base (1), a movable hole matched with the latches (5) is opened on the surface of the base (1), and the latches (5) are inserted into the movable holes opened on the base (1), characterized in that: A disassembly assembly (6) is installed on the base (1), and the disassembly assembly (6) includes a slide rail (601) fixed on the outer surface of the base (1), a moving block (603) slidably connected to the surface of the slide rail (601), and a locking rod (604) slidably connected to the inside of the moving block (603). A plug hole (606) adapted to the locking rod (604) is provided on the surface of the slide rail (601) close to the latch (5). A spring (605) is wound around the surface of the locking rod (604). The two ends of the spring (605) are respectively fixedly connected to the moving block (603) and the locking rod (604). A fixing rod (607) is arranged at the top of the block (603), a sleeve (608) is sleeved on the surface of the fixing rod (607), an annular disk (609) is fixed on the top of the surface of the sleeve (608), a rectangular plate (610) is fixed on the outer bottom of the sleeve (608), a striking block (612) is slidably connected to the surface of the sleeve (608), a spring (614) in a stretched state is wound around the surface of the fixing rod (607), two ends of the spring (614) are respectively fixedly connected to the fixing rod (607) and the annular disk (609), and a gasket (613) is fixed on the surface of the latch (5).

2. A fixing bracket for a construction engineering formwork according to claim 1, characterized in that: The surface of the moving block (603) is provided with a convex groove that is compatible with the slide rail (601), and the moving block (603) and the slide rail (601) are slidably connected through the convex groove. The surface of the moving block (603) close to the locking rod (604) is provided with a through hole that is compatible with the locking rod (604), and the locking rod (604) and the moving block (603) are slidably connected through the through hole. The surface of the striking block (612) is provided with a circular hole that is compatible with the sleeve (608), and the striking block (612) and the sleeve (608) are slidably connected through the circular hole. The sleeve (608) is slidably connected to the surface of the fixed rod (607), and the inner wall of the sleeve (608) is in contact with the outer surface of the fixed rod (607).

3. A fixing bracket for a construction engineering formwork according to claim 2, characterized in that: The diameter of the gasket (613) is smaller than the maximum diameter of the top of the latch (5) and larger than the diameter of the movable hole opened in the base (1); the thickness of the gasket (613) is larger than the thickness of the rectangular plate (610).

4. A fixing bracket for a construction engineering formwork according to claim 3, characterized in that: A silicone pad (611) is fixed on the surface of the striking block (612).

5. A fixing bracket for a construction engineering formwork according to claim 4, characterized in that: The upper surface of the base (1) is provided with a mounting groove (602).

6. A fixing bracket for a construction engineering formwork according to claim 5, characterized in that: A storage assembly (7) is installed on the base (1), and the storage assembly (7) comprises a limiting groove (701) provided on the upper surface of the base (1) near the installation groove (602), a limiting hole (703) provided on the surface of the base (1) near the limiting groove (701), and a limiting pin (702) fixed on the lower surface of the annular disk (609), the limiting hole (703) and the limiting groove (701) are connected to each other, the limiting pin (702) and the limiting hole (703) are matched with each other, a movable groove is provided on the upper surface of the movable block (603), and a movable block (704) is arranged in the sliding groove, rotating rods are fixed on both sides of the movable block (704), and one end of the rotating rod is rotatably connected to the movable block (603) through a bearing, and the fixed rod (607) is fixed on the upper surface of the movable block (704).

7. A fixing bracket for a construction engineering formwork according to claim 6, characterized in that: The bottom of the movable block (704) is provided with an arc chamfer, and two sides of the movable block (704) are respectively in contact with the surface of the base (1) and the surface of the moving block (603).

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