Air tightness testing device for optical lens assembly

Abstract

The utility model relates to the technical field of air tightness testing, in particular to an air tightness testing device for an optical lens assembly, which comprises an air tightness detector, a platform and an optical lens assembly body, an upper clamping block is arranged at the upper end of the outer side of the optical lens assembly body, and a lower clamping block is arranged at the lower end of the outer side of the optical lens assembly body. A mounting block is arranged on the lower side of the lower clamping block, a lifting plate is arranged on the upper side of the upper clamping block, quick-release mounting units are arranged between the lower clamping block and the mounting block and between the upper clamping block and the lifting plate, the mounting block is mounted on the upper side of the platform through bolts, and a clamping measuring unit is arranged between the lower clamping block and the upper clamping block. By arranging the upper clamping block, the lower clamping block, the mounting block, the lifting plate and the quick dismounting and mounting unit, the clamping die can be quickly dismounted and mounted, the mounting efficiency of the clamping die is improved, time waste is reduced, and the machining efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of air tightness testing, in particular to an air tightness testing device for an optical lens assembly. Background Art

[0002] Optical lenses are optical glass lenses. Optical glass is made of high-purity silicon, boron, sodium, potassium, zinc, lead, magnesium, calcium, barium and other oxides mixed according to a specific formula, melted at high temperature in a platinum crucible, stirred evenly with ultrasound to remove bubbles; then slowly cooled for a long time to prevent the glass block from generating internal stress. The cooled glass block must be measured by optical instruments to check whether the purity, transparency, uniformity, refractive index and dispersion rate meet the specifications. Qualified glass blocks are heated and forged to form optical lens blanks, and optical lens assemblies are components for installing optical glass lenses immediately.

[0003] Air tightness test is a kind of tightness test with gas as pressurized medium to prevent leakage of pressure vessels. It is necessary to conduct air tightness test for pressure vessels whose internal medium is extremely toxic, highly hazardous or whose design does not allow for trace leakage. Air tightness test can only be conducted after passing hydraulic test. Containers that have passed air pressure test can generally be exempted from air tightness test, or according to the requirements of design drawings. The gas used in air tightness test is the same as the requirements of air pressure test.

[0004] After the installation of the optical lens assembly is completed, it will be tested for airtightness to ensure the installation quality of the optical lens assembly. During the test, it will be clamped by a special clamping mold before testing. However, due to the differences in the outer surface and size of the optical lens assembly, the clamping mold needs to be replaced when testing different optical lens assemblies, which affects the processing efficiency. For this reason, we propose an optical lens assembly airtightness test device to solve the above problem. Utility Model Content

[0005] The purpose of the utility model is to solve the problem in the prior art that an optical lens assembly is subjected to an airtightness test after installation to ensure the installation quality of the optical lens assembly. During the test, the optical lens assembly is clamped by a special clamping mold before the test. However, due to the differences in the outer surfaces and sizes of the optical lens assemblies, the clamping mold needs to be replaced when testing different optical lens assemblies, which affects the processing efficiency. An optical lens assembly airtightness testing device is proposed.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] An optical lens assembly air tightness testing device is designed, comprising an air tightness tester, a platform and an optical lens assembly body, wherein the air tightness tester is installed on the upper side of the platform and is connected to a power supply and a controller through a wire, an upper clamping block is provided at the upper end of the outer side of the optical lens assembly body, a lower clamping block is provided at the lower end of the outer side of the optical lens assembly body, an A positioning groove is provided on the lower side of the upper clamping block and the upper side of the lower clamping block, the outer side of the optical lens assembly body is fitted with the inner side of the A positioning groove, a mounting block is provided on the lower side of the lower clamping block, a lifting plate is provided on the upper side of the upper clamping block, a quick-release mounting unit is provided between the lower clamping block and the mounting block and between the upper clamping block and the lifting plate, the mounting block is mounted on the upper side of the platform by bolts, and a clamping measurement unit is provided between the lower clamping block and the upper clamping block.

[0008] Preferably, the clamping measurement unit includes a measuring head, a limit block A is provided on the front side of the optical lens assembly body, and a moving block is provided on the rear side of the optical lens assembly body, the A limit block and the moving block can both slide on the inner side of the A positioning groove on the upper clamping block, the A limit block is fixedly connected to the lower clamping block, A electric push rods are fixed on both sides of the lower clamping block, four B electric push rods are fixed on the upper side of the platform, the shaft end of the A electric push rod is fixedly connected to the moving block, the B electric push rod is fixedly connected to the lifting plate, the A electric push rod and the B electric push rod are both connected to a power supply and a controller through wires, a through hole is provided on the rear side of the moving block, a mounting cylinder is fixed on the rear side of the moving block and the mounting cylinder is communicated with the through hole, the measuring head is mounted on the inner side of the mounting cylinder through a threaded seal, and the measuring head is connected to the air tightness detector through an air pipe.

[0009] By adopting the above technical solution, the A electric push rod and the B electric push rod automatically drive the lower clamping block, the upper clamping block, the A limit block and the moving block to clamp the optical lens assembly body, and the measuring head is connected to the optical lens assembly body, thereby realizing automatic detection capability and improving detection efficiency.

[0010] Preferably, a buffer block is fixed to the rear side of the A limit block.

[0011] By adopting the above technical solution, the buffer block is brought into contact with the optical lens on the optical lens assembly body, thereby reducing damage to the optical lens on the optical lens assembly body during clamping and improving the overall quality of the optical lens assembly body after inspection.

[0012] Preferably, a mounting groove is provided on the front side of the moving block, and a sealing ring is provided on the rear side of the optical lens assembly body, and the sealing ring is installed on the inner side of the mounting groove.

[0013] By adopting the above technical solution, the sealing ring is clamped on the rear side of the optical lens assembly body, which reduces the probability of leakage of the optical lens assembly body during detection and improves the detection quality.

[0014] Preferably, the quick-release mounting unit comprises two springs and a mounting shell, one side of the upper clamping block and the lower clamping block are both provided with a through hole, two movable plates are slid on the inner side of the mounting shell, the spring is located between the two movable plates, the front and rear ends of the inner side of the spring are sleeved with a connecting shaft, the connecting shaft is fixedly connected to the movable plate, a positioning block is fixed on the side of the movable plate away from the spring, a limiting ring is slidably provided on the outer side of the positioning block, the limiting ring is fixedly connected to the mounting shell, an A connecting block is provided on the side of the limiting ring away from the movable plate, a B positioning groove is provided on the side of the A connecting block facing the positioning block, the positioning block can be slid inside the B positioning groove, the A connecting block is fixedly connected between the upper clamping block and the lower clamping block, a B connecting block is fixed on the side of the mounting shell facing the optical lens assembly body, B limiting blocks are provided on the left and right sides of the A connecting block, and the B limiting block and the B connecting block are fixedly connected, the B limiting block and the B connecting block are fixedly connected to the inner side of the through hole, and a quick-release portion is provided between the movable plate and the through hole.

[0015] By adopting the above technical solution, the lower clamping block and the upper clamping block can be quickly installed on the mounting block and the lifting plate, thereby improving the installation efficiency.

[0016] Preferably, the quick-release part includes two connecting rods, sliding holes are provided at both ends of the left and right sides of the mounting shell, a linkage block is slidably arranged inside the sliding hole, two guide holes are provided at the front and back sides of the upper clamp block and the lower clamp block, guide rods are slidably arranged inside the guide holes, the guide rods are fixedly connected to the linkage block and the connecting rod, limit plates are provided at the front and back sides of the upper clamp block and the lower clamp block, two positioning rings are slidably arranged on the outer side of the limit plate and the positioning rings are fixedly connected to the upper clamp block and the lower clamp block, and an auxiliary block is fixedly arranged on the upper side of the limit plate.

[0017] By adopting the above technical solution, the lower clamping block and the upper clamping block can be quickly disassembled from the mounting block and the lifting plate, thereby improving the disassembly efficiency.

[0018] The utility model provides an optical lens assembly airtightness testing device, which has the following beneficial effects:

[0019] 1. By setting the upper clamping block, the lower clamping block, the mounting block, the lifting plate and the quick-release mounting unit, the clamping mold can be quickly disassembled and installed, which improves its installation efficiency, reduces time waste and improves processing efficiency.

[0020] 2. By setting up the clamping and measuring unit, automatic clamping and measurement are realized, which improves the measurement efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1This is a schematic diagram of a three-dimensional structure of an optical lens assembly air tightness test device proposed by the utility model, viewed from the right front side;

[0022] Figure 2 The utility model proposed Figure 1 A partial enlarged schematic diagram of the three-dimensional structure of the middle A area;

[0023] Figure 3 The utility model proposed Figure 1 A schematic diagram of the partially enlarged three-dimensional structure of the middle B area;

[0024] Figure 4 It is a left-side cutaway three-dimensional structural schematic diagram of an optical lens assembly airtightness testing device proposed by the utility model;

[0025] Figure 5 The utility model proposed Figure 4 A schematic diagram of the partially enlarged three-dimensional structure of the middle C area;

[0026] Figure 6 The utility model proposed Figure 4 A schematic diagram of the partially enlarged three-dimensional structure of the middle D area;

[0027] Figure 7 The utility model proposed Figure 4 A schematic diagram of the partially enlarged three-dimensional structure of the middle E area;

[0028] Figure 8 This is a schematic diagram of the upper three-dimensional structure of an optical lens assembly airtightness testing device proposed by the utility model;

[0029] Fig. 9 The utility model proposed Figure 8 Schematic diagram of the partially enlarged three-dimensional structure of the middle F area.

[0030] In the figure: 1. air tightness tester; 2. platform; 3. optical lens assembly body; 4. upper clamping block; 5. lower clamping block; 6. mounting block; 7. lifting plate; 8. quick release mounting unit; 81. spring; 82. mounting shell; 83. moving plate; 84. connecting shaft; 85. positioning block; 86. limiting ring; 87. A connecting block; 88. quick release part; 881. connecting rod; 882. linkage block; 883. guide rod; 884. limiting plate; 885. positioning ring; 886. auxiliary block; 89. B connecting block; 810. B limiting block; 9. clamping measuring unit; 91. measuring head; 92. A limiting block; 93. moving block; 94. A electric push rod; 95. B electric push rod; 96. mounting tube; 97. buffer block; 98. sealing ring. DETAILED DESCRIPTION

[0031] The technical scheme in the embodiments of the present invention will be clarified and fully described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] Reference Figure 1-9 An optical lens assembly air tightness test device comprises an air tightness detector 1, a platform 2 and an optical lens assembly body 3, wherein the air tightness detector 1 is mounted on the upper side of the platform 2 and the air tightness detector 1 is connected to a power supply and a controller through a wire, and the platform 2 can be placed on a table or other flat surface for testing, an upper clamping block 4 is arranged at the upper end of the outer side of the optical lens assembly body 3, a lower clamping block 5 is arranged at the lower end of the outer side of the optical lens assembly body 3, a positioning groove A is arranged at the lower side of the upper clamping block 4 and the upper side of the lower clamping block 5, and the optical lens assembly body 3 is fitted with the inner side of the A positioning groove, and the A positioning groove on the upper clamp block 4 and the lower clamp block 5 is provided with a sealing block, which is used to seal the leaking area on the outer surface of the optical lens assembly body 3 to improve the accuracy of the subsequent detection data. At the same time, the A positioning groove and the outer sides of the upper clamp block 4 and the lower clamp block 5 are fitted, so that the upper clamp block 4 and the lower clamp block 5 play a role in limiting the optical lens assembly body 3. A mounting block 6 is provided on the lower side of the lower clamp block 5, and the mounting block 6 is installed on the upper side of the platform 2 by bolts. A lifting plate 7 is provided on the upper side of the upper clamp block 4.

[0033] A quick-release mounting unit 8 is provided between the lower clamping block 5 and the mounting block 6 and between the upper clamping block 4 and the lifting plate 7. The quick-release mounting unit 8 includes two springs 81 and a mounting shell 82. A through hole is provided on one side of the upper clamping block 4 and the lower clamping block 5. Two movable plates 83 are slidably provided on the inner side of the mounting shell 82. The spring 81 is located between the two movable plates 83. A positioning block 85 is fixed on the side of the movable plate 83 away from the spring 81. A limiting ring 86 is slidably provided on the outer side of the positioning block 85. The limiting ring 86 is fixedly connected to the mounting shell 82. A connecting shaft 84 is sleeved on both the front and rear ends of the inner side of the spring 81. The connecting shaft 84 is fixedly connected to the movable plate 83. The connecting shaft 84 plays a role of installation limiting for the spring 81, making the movement of the spring 81 more stable. A connecting block 87 is provided on the side of the limiting ring 86 away from the movable plate 83, and a positioning groove B is provided on the side of the connecting block 87 facing the positioning block 85. The positioning block 85 can slide inside the B positioning groove, and the A connecting block 87 is fixedly connected to the upper clamping block 4 and the lower clamping block 5. The lower side of the A connecting block 87 and the upper side of the positioning block 85 are both chamfered. When the upper clamping block 4 and the lower clamping block 5 are installed on the lifting plate 7 and the mounting block 6, the A connecting block 87 is allowed to enter the through holes on the lifting plate 7 and the mounting block 6 and contact the positioning block 85. After the two are in contact, the A connecting block 87 will squeeze the positioning block 85 into the mounting shell 82. After the A connecting block 87 moves to a certain position, under the action of the reset of the spring 81, the positioning block 85 is allowed to enter the B positioning groove on the A connecting block 87, so that the positioning block 85 clamps the A connecting block 87, and the upper clamping block 4 and the lower clamping block 5 will be installed on the lowering plate 7 and the mounting block 6 as the A connecting block 87 is clamped, thereby realizing the rapid installation of the upper clamping block 4 and the lower clamping block 5 and improving the installation efficiency.

[0034] A B connecting block 89 is fixed on the side of the mounting shell 82 facing the optical lens assembly body 3. The connecting block 89 limits the installation of the upper clamp block 4 and the lower clamp block 5, and supports the mounting shell 82. B limiting blocks 810 are provided on both sides of the A connecting block 87, and the B limiting blocks 810 are fixedly connected to the B connecting block 89. The B limiting blocks 810 and the B connecting blocks 89 are fixedly connected to the inner side of the through hole. The B limiting blocks 810 limit the A connecting block 87, which facilitates the positioning of the upper clamp block 4 and the lower clamp block 5 during installation.

[0035] A quick-release portion 88 is provided between the movable plate 83 and the through hole, and the quick-release portion 88 includes two connecting rods 881. Sliding holes are provided at both ends of the left and right sides of the mounting shell 82, and a linkage block 882 is slidably provided inside the sliding hole. Two guide holes are provided on the front and back sides of the upper clamping block 4 and the lower clamping block 5, and a guide rod 883 is slidably provided inside the guide hole. The guide rod 883 is fixedly connected to the linkage block 882 and the connecting rod 881. A limit plate 884 is provided on the front and back sides of the upper clamping block 4 and the lower clamping block 5, and two positioning rings 885 are slidably provided on the outer side of the limit plate 884, and the positioning ring 885 is fixedly connected to the upper clamping block 4 and the lower clamping block 5. An auxiliary block 886 is fixed on the upper side of the limit plate 884, and the auxiliary block 886 can help the limit plate 884 to move while avoiding the limit The plate 884 moves downward, and the guide rod 883 is moved simultaneously through the connecting rod 881, and the guide rod 883 drives the movable plate 83 to move in the mounting shell 82 through the linkage block 882, so that the movable plate 83 moves out of the B positioning groove on the A connecting block 87 with the positioning block 85, so that the positioning block 85 no longer blocks the A connecting block 87, so that the upper clamping block 4 and the lower clamping block 5 can be quickly disassembled. At the same time, when the connecting rod 881 moves, the limit plate 884 needs to be moved upward first, and when the upper clamping block 4 and the lower clamping block 5 move to the surface of the upper clamping block 4 and the lower clamping block 5, the limit plate 884 is inserted into the positioning ring 885, and the connecting rod 881 is clamped by the limit plate 884 to prevent the connecting rod 881 from resetting, making disassembly more convenient and improving disassembly efficiency.

[0036] A clamping and measuring unit 9 is provided between the lower clamping block 5 and the upper clamping block 4, and the clamping and measuring unit 9 includes a measuring head 91, an A limit block 92 is provided on the front side of the optical lens assembly body 3, and a moving block 93 is provided on the rear side of the optical lens assembly body 3. Both the A limit block 92 and the moving block 93 can slide on the inner side of the A positioning groove on the upper clamping block 4, and the A limit block 92 is fixedly connected to the lower clamping block 5. A buffer block 97 is fixed on the rear side of the A limit block 92, and one end of the optical lens on the optical lens assembly body 3 is pressed against the buffer block 97, so as to reduce the damage to the optical lens on the optical lens assembly body 3 during the detection process and improve the quality of the optical lens on the optical lens assembly body 3 after the detection.

[0037] A electric push rods 94 are fixed on both sides of the lower clamping block 5, four B electric push rods 95 are fixed on the upper side of the platform 2, the shaft end of the A electric push rod 94 is fixedly connected to the moving block 93, a mounting groove is provided on the front side of the moving block 93, a sealing ring 98 is provided on the rear side of the optical lens assembly body 3, the sealing ring 98 is installed on the inner side of the mounting groove, and is clamped on the rear side of the optical lens assembly body by the sealing ring 98, thereby reducing the probability of leakage of the optical lens assembly body during detection and improving the detection quality, the B electric push rod 95 is fixedly connected to the lifting plate 7, the A electric push rod 94 and the B electric push rod 95 are connected to the power supply and the controller through wires, a through hole is provided on the rear side of the moving block 93, a mounting cylinder 96 is fixed on the rear side of the moving block 93 and the mounting cylinder 96 is communicated with the through hole, and the measuring head 91 is mounted on the mounting cylinder 96 through a threaded seal. On the inside, the measuring head 91 is connected to the airtightness tester 1 through an air pipe, and the A electric push rod 94 moves with the moving block 93. When the moving block 93 moves backward away from the lower clamping block 5, it is convenient to place the optical lens assembly body 3. Then the A electric push rod 94 moves with the moving block 93 in the direction of the lower clamping block 5. Then the B electric push rod 95 moves the upper clamping block 4 downward through the lifting plate 7, so that the upper clamping block 4 and the lower clamping block 5 are in contact, so that the upper clamping block 4, the lower clamping block 5, the A limit block 92 and the moving block 93 form a placement container for the optical lens assembly body 3. At the same time, the measuring head 91 will move together with the moving block 93. Then the airtightness tester 1 is started and the optical lens assembly body 3 is inflated and tested through the measuring head 91, thereby realizing the function of automatic detection and improving the efficiency of detection.

[0038] In the description of this patent, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position; be constructed and operated in a specific position, and therefore cannot be understood as a limitation of the utility model; the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance; in addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0039] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An optical lens assembly airtightness test device, comprising an airtightness detector (1), a platform (2) and an optical lens assembly body (3), wherein the airtightness detector (1) is mounted on the upper side of the platform (2) and the airtightness detector (1) is connected to a power supply and a controller via a wire, characterized in that: An upper clamping block (4) is provided at the upper end of the outer side of the optical lens assembly body (3), and a lower clamping block (5) is provided at the lower end of the outer side of the optical lens assembly body (3). A positioning groove is provided on the lower side of the upper clamping block (4) and the upper side of the lower clamping block (5). The outer side of the optical lens assembly body (3) is in contact with the inner side of the A positioning groove. A mounting block (6) is provided on the lower side of the lower clamping block (5), and a lifting plate (7) is provided on the upper side of the upper clamping block (4). A quick-release mounting unit (8) is provided between the lower clamping block (5) and the mounting block (6) and between the upper clamping block (4) and the lifting plate (7). The mounting block (6) is mounted on the upper side of the platform (2) by bolts, and a clamping and measuring unit (9) is provided between the lower clamping block (5) and the upper clamping block (4).

2. The air tightness testing device for optical lens assembly according to claim 1, characterized in that: The clamping measurement unit (9) comprises a measuring head (91), an A limit block (92) is provided on the front side of the optical lens assembly body (3), and a moving block (93) is provided on the rear side of the optical lens assembly body (3), the A limit block (92) and the moving block (93) can both slide inside the A positioning groove on the upper clamping block (4), the A limit block (92) is fixedly connected to the lower clamping block (5), and the left and right sides of the lower clamping block (5) are fixed with A electric push rods (94), and the upper side of the platform (2) is fixed with four B electric push rods (95), and the A electric push rods (95) are fixed with the upper side of the platform (2). The shaft end of the rod (94) is fixedly connected to the moving block (93), the B electric push rod (95) is fixedly connected to the lifting plate (7), the A electric push rod (94) and the B electric push rod (95) are connected to a power supply and a controller through a wire, a through hole is provided on the rear side of the moving block (93), a mounting tube (96) is fixed on the rear side of the moving block (93), and the mounting tube (96) is communicated with the through hole, the measuring head (91) is mounted on the inner side of the mounting tube (96) through a threaded seal, and the measuring head (91) is connected to the air tightness detector (1) through an air pipe.

3. The air tightness testing device for optical lens assembly according to claim 2, characterized in that: A buffer block (97) is fixed to the rear side of the A limit block (92).

4. The air tightness testing device for optical lens assembly according to claim 2, characterized in that: The front side of the moving block (93) is provided with a mounting groove, and the rear side of the optical lens assembly body (3) is provided with a sealing ring (98), and the sealing ring (98) is installed on the inner side of the mounting groove.

5. The optical lens assembly air tightness testing device according to claim 1, characterized in that: The quick-release installation unit (8) comprises two springs (81) and an installation shell (82). A through hole is provided on one side of the upper clamping block (4) and the lower clamping block (5). Two movable plates (83) are slidably disposed inside the installation shell (82). The spring (81) is located between the two movable plates (83). Both front and rear ends of the inner side of the spring (81) are sleeved with connecting shafts (84). The connecting shaft (84) is fixedly connected to the movable plate (83). A positioning block (85) is fixedly disposed on the side of the movable plate (83) away from the spring (81). A limiting ring (86) is slidably disposed on the outer side of the positioning block (85). The limiting ring (86) is fixedly connected to the installation shell (82). The limiting ring (86) is away from the movable plate. (83) A connecting block (87) is provided on one side, and a B positioning groove is provided on the side of the A connecting block (87) facing the positioning block (85), and the positioning block (85) can slide inside the B positioning groove, and the A connecting block (87) is fixedly connected to the upper clamping block (4) and the lower clamping block (5), and a B connecting block (89) is fixedly connected to the side of the mounting shell (82) facing the optical lens assembly body (3), and B limit blocks (810) are provided on both sides of the A connecting block (87), and the B limit blocks (810) and the B connecting block (89) are fixedly connected, and the B limit blocks (810) and the B connecting block (89) are fixedly connected to the inner side of the through hole, and a quick release portion (88) is provided between the movable plate (83) and the through hole.

6. The air tightness testing device for optical lens assembly according to claim 5, characterized in that: The quick-release part (88) comprises two connecting rods (881), the left and right sides and the front and rear ends of the mounting shell (82) are both provided with sliding holes, and a linkage block (882) is slidably arranged inside the sliding hole, the front and rear sides of the upper clamping block (4) and the lower clamping block (5) are both provided with two guide holes, and the guide rods (883) are slidably arranged inside the guide holes, and the guide rods (883) are fixedly connected to the linkage block (882) and the connecting rod (881), the front and rear sides of the upper clamping block (4) and the lower clamping block (5) are both provided with limiting plates (884), the outer side of the limiting plate (884) is provided with two positioning rings (885) for sliding, and the positioning rings (885) are fixedly connected to the upper clamping block (4) and the lower clamping block (5), and an auxiliary block (886) is fixedly arranged on the upper side of the limiting plate (884).

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