Indium tile ruler assembly for leveling

Abstract

The utility model discloses an indium tile ruler assembly for leveling, and relates to the technical field of leveling. The device comprises an indium tile ruler. The indium tile ruler is provided with a positioning assembly, a clamping assembly, a guiding assembly, a clamping assembly and an extending assembly. By pulling the handle, the clamping piece fixed on one side can be driven to move in the direction of the limiting groove, so that the inner side of the clamping piece is attached to the outer surface of the indium tile ruler, and then the handle is pushed to drive the clamping piece to move towards the side close to the indium tile ruler. According to the indium tile ruler assembly for leveling, the clamping piece is arranged on one side of the indium tile ruler, so that the clamping piece drives the clamping groove formed in one side to move, the interior of the clamping groove is clamped with a bolt cap mounted in the indium tile ruler, the mounting plate can be mounted at one end of the indium tile ruler, the indium tile ruler assembly for leveling can be conveniently dismounted and mounted, and the practicability of the indium tile ruler assembly is improved.

Description

Technical Field

[0001] This utility model belongs to the field of leveling technology, and specifically relates to an invar ruler assembly for leveling. Background Technology

[0002] The invar leveling rod used in leveling is a special measuring tool designed specifically for high-precision leveling. The invar leveling rod is the cornerstone of precision leveling. Its core value lies in the ultra-low thermal expansion of the invar alloy, which makes high-precision elevation measurement possible even in varying natural temperature environments.

[0003] In existing technologies, the observation point is typically exposed by opening the cover of the observation point protection box, then one end of the invar ruler is inserted into the protection box and placed on the observation point. However, some protective boxes are smaller than the width of the invar ruler, making it impossible for the invar ruler to pass through the protection box and contact the top of the observation point. As a result, the protection box needs to be removed, which can easily damage the monitoring point. Utility Model Content

[0004] In view of the problem that some protective shells are smaller than the width of the invar ruler, making it impossible for the invar ruler to pass through the protective box and contact the top of the observation point, thus requiring the removal of the protective box and easily damaging the monitoring point, this utility model proposes an invar ruler assembly for leveling to overcome the above-mentioned technical problems existing in the existing related technologies.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0006] This utility model relates to an invar tape assembly for leveling, comprising an invar tape:

[0007] The invar ruler is equipped with positioning components, snap-fit ​​components, guiding components, clamping components, and extension components.

[0008] A positioning component is fitted inside the indium tile ruler and onto its outer surface so that the indium tile ruler restricts the position of the positioning component.

[0009] The snap-fit ​​assembly is internally snapped onto the outer surface of the invar ruler so that the snap-fit ​​assembly, in conjunction with the invar ruler, restricts the position of the positioning assembly;

[0010] A guide component, one side of which is fixedly connected to one side of the snap-fit ​​component, so that the guide component guides the movement direction of the snap-fit ​​component and provides a pulling force to the snap-fit ​​component;

[0011] The clamping component has its interior fitting against the outer surface of the extension component to clamp and fix the extension component.

[0012] Furthermore, the positioning component includes a positioning sleeve, the inside of which is fitted onto the outer surface of the invar ruler, and a mounting plate is fixedly connected to the bottom end of the positioning sleeve.

[0013] Furthermore, the snap-fit ​​assembly includes a limiting groove, which is formed at the top of the mounting plate. A snap-fit ​​piece is slidably disposed inside the limiting groove. A snap-fit ​​groove is formed on one side of the snap-fit ​​piece. The inside of the snap-fit ​​groove is snap-fitted to the outer surface of the invar ruler. A handle is fixedly connected to one side of the snap-fit ​​piece.

[0014] Furthermore, the guide assembly includes a support base, the bottom end of which is fixedly connected to the top end of the mounting plate, a guide rod fixedly connected to one side of the support base, a connecting piece slidably connected to the outer surface of the guide rod, and one side of the connecting piece being fixedly connected to one side of the snap-fit ​​piece.

[0015] A first tension spring is sleeved on the outer surface of the guide rod, and one end of the first tension spring is fixedly connected to one side of the connecting piece.

[0016] Furthermore, the clamping assembly includes a mounting block, the top of which is fixedly mounted to the bottom of the mounting plate. A limit rod is fixedly connected inside the mounting block, and a movable block is slidably connected to the outer surface of the limit rod. A second tension spring is fixedly connected to one side of the movable block.

[0017] Furthermore, the clamping assembly also includes a support groove, which is located at the bottom of the mounting plate. A support block is slidably connected inside the support groove, and a clamping block is fixedly connected to the bottom of the support block. One side of the clamping block is fixedly connected to one side of the moving block. A guide groove is provided on one side of the clamping block, and a clamping groove is provided inside the guide groove.

[0018] Furthermore, the extension assembly includes a connecting plate, the outer surface of which fits into the interior of the clamping groove, and an extension rod is fixedly connected to the bottom end of the connecting plate.

[0019] This utility model has the following beneficial effects:

[0020] 1. This utility model involves pulling the snap-fit ​​assembly to move it along the direction of a guide assembly fixed on one side, so that the width between the snap-fit ​​assemblies is greater than the width of one end of the indium tile ruler. Then, the snap-fit ​​assembly is fitted onto one end of the indium tile ruler, causing the snap-fit ​​assembly to move the positioning assembly, which is slidably mounted on its outer surface, closer to the end of the indium tile ruler. This allows the interior of the positioning assembly to fit onto the outer surface of the indium tile ruler, thus restricting the position of the positioning assembly. Then, the snap-fit ​​assembly is released, allowing it to reset under the pulling force applied by the guide assembly. During the reset process, the snap-fit ​​assembly engages with the outer surface of the indium tile ruler, facilitating the installation of the positioning assembly at one end of the indium tile ruler. The positioning assembly, together with the clamping assembly installed at the bottom, restricts the center position of the extension assembly, ensuring that the central axis between the extension assembly and the indium tile ruler is aligned. This allows the indium tile ruler to extend into the protective box and contact the observation point with the extension assembly, without the need to remove the protective box.

[0021] 2. By pulling the handle, this utility model can move the locking piece fixed on one side along the direction of the limiting groove, so that the inner side of the locking piece is in contact with the outer surface of the indium tile ruler. Then, by pushing the handle, the locking piece is moved closer to the indium tile ruler, so that the locking piece can move the locking groove opened on one side, so that the inside of the locking groove can engage with the bolt cap installed inside the indium tile ruler. This allows the mounting plate to be installed on one end of the indium tile ruler, which facilitates the disassembly and installation of the indium tile ruler assembly used for leveling, thus improving its practicality.

[0022] 3. This utility model inserts one side of the connecting plate into the guide groove between the two sets of clamping blocks. Since the inside of the guide groove is arc-shaped, when the connecting plate is pushed to move, it can cooperate with the guide groove to push the clamping blocks to move. When the connecting plate moves to one side of the clamping groove, the clamping blocks will reset and move to cooperate with the clamping groove to clamp and fix the connecting plate. This is to restrict the extension rod fixed at the bottom of the connecting plate, thereby facilitating the disassembly and installation of the connecting plate and the extension rod, and making maintenance and replacement more convenient.

[0023] Of course, any product implementing this utility model does not necessarily need to achieve all of the above advantages at the same time. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the utility model embodiments, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1This is a three-dimensional structural diagram of the present invention;

[0026] Figure 2 This is a partial structural diagram of the present invention from a right-side view.

[0027] Figure 3 This is a partial structural schematic diagram of the present invention from a frontal view.

[0028] Figure 4 For the present utility model Figure 3 Enlarged schematic diagram of the local structure at point A;

[0029] Figure 5 This is a partial structural diagram of the present invention from a downward viewing angle;

[0030] Figure 6 For the present utility model Figure 5 An enlarged schematic diagram of the local structure at point B.

[0031] The attached diagram lists the components represented by each number as follows:

[0032] 1. Invar ruler; 2. Positioning assembly; 201. Positioning sleeve; 202. Mounting plate; 3. Snap-fit ​​assembly; 301. Limiting groove; 302. Snap-fit ​​piece; 303. Snap-fit ​​groove; 304. Handle; 4. Guide assembly; 401. Support base; 402. Guide rod; 403. Connecting piece; 404. First tension spring; 5. Clamping assembly; 501. Mounting block; 502. Limiting rod; 503. Moving block; 504. Second tension spring; 505. Support groove; 506. Support block; 507. Clamping block; 508. Guide groove; 509. Clamping groove; 6. Extension assembly; 601. Connecting plate; 602. Extension rod. Detailed Implementation

[0033] The technical solutions of the utility model embodiments will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the utility model, and not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the utility model.

[0034] In the description of this utility model, it should be understood that the terms "opening", "upper", "lower", "top", "middle", "inner", etc., which indicate orientation or positional relationship, are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0035] Please see Figures 1-6As shown, this utility model is an invar ruler assembly for leveling, including an invar ruler 1:

[0036] The Invar ruler 1 is respectively provided with a positioning component 2, a snap-fit ​​component 3, a guide component 4, a clamping component 5, and an extension component 6;

[0037] Positioning component 2 is sleeved with the outer surface of indium tile ruler 1 so that indium tile ruler 1 restricts the position of positioning component 2;

[0038] The snap-fit ​​component 3 is internally snap-fitted to the outer surface of the invar ruler 1 so that the snap-fit ​​component 3 cooperates with the invar ruler 1 to restrict the position of the positioning component 2;

[0039] The guide component 4 is fixedly connected to one side of the snap-fit ​​component 3 so that the guide component 4 guides the movement direction of the snap-fit ​​component 3 and provides a pulling force to the snap-fit ​​component 3.

[0040] The clamping component 5 has its interior fitting against the outer surface of the extension component 6, so that the extension component 6 of the clamping component 5 is clamped and fixed.

[0041] In use, by aligning one side of the extension component 6 with the curved surface of one side of the clamping component 5, and then pushing the extension component 6, the clamping component 5 can be moved to both sides, allowing the extension component 6 to enter the interior of the clamping component 5. This allows the clamping component 5 to clamp and fix the extension component 6. Then, by pulling the snap-fit ​​component 3, it is moved along the direction of the guide component 4 fixed on one side, so that the width between the snap-fit ​​components 3 is greater than the width of one end of the indium tile ruler 1. Then, the snap-fit ​​component 3 is inserted into one end of the indium tile ruler 1, thereby causing the snap-fit ​​component 3 to move the positioning component 2, which is slidably set on the outer surface, closer to the end of the indium tile ruler 1. The device is moved so that the inside of the positioning component 2 fits into the outer surface of the indium ruler 1, thereby restricting the position of the positioning component 2. Then, the locking component 3 is released, allowing it to reset in conjunction with the pulling force applied by the guide component 4. This causes the locking component 3 to engage with the outer surface of the indium ruler 1 during the reset process, facilitating the installation of the positioning component 2 at one end of the indium ruler 1. The positioning component 2, together with the clamping component 5 installed at the bottom, restricts the center position of the extension component 6, ensuring that the central axis between the extension component 6 and the indium ruler 1 is aligned. This facilitates the measurement of the observation point position by the indium ruler 1 in conjunction with the extension component 6.

[0042] This invention involves pulling the locking assembly 3 to move it along the direction of the guide assembly 4 fixed on one side, so that the width between the locking assemblies 3 is greater than the width of one end of the indium ruler 1. Then, the locking assembly 3 is fitted onto one end of the indium ruler 1, causing the locking assembly 3 to move the positioning assembly 2, which is slidably disposed on its outer surface, closer to the end of the indium ruler 1. This allows the interior of the positioning assembly 2 to fit onto the outer surface of the indium ruler 1, thereby restricting the position of the positioning assembly 2. Then, the locking assembly 3 is released, allowing it to reset in conjunction with the pulling force applied by the guide assembly 4. During the reset process, the locking assembly 3 engages with the outer surface of the indium ruler 1, facilitating the installation of the positioning assembly 2 at one end of the indium ruler 1. The positioning assembly 2, together with the clamping assembly 5 installed at the bottom, restricts the center position of the extension assembly 6, ensuring that the central axis between the extension assembly 6 and the indium ruler 1 is aligned. This allows the indium ruler 1 to penetrate the protective box and contact the observation point with the extension assembly 6, without the need to remove the protective box.

[0043] In one embodiment, the positioning component 2 includes a positioning sleeve 201, the inside of which is sleeved with the outer surface of the Invar ruler 1, and the bottom end of the positioning sleeve 201 is fixedly connected to an mounting plate 202.

[0044] The positioning sleeve 201 is provided in two sets, so that its interior can be sleeved with the bolts provided at the bottom of the invar ruler 1, thereby restricting the position of the mounting plate 202 fixed at the bottom of the positioning sleeve 201, thus ensuring that the central axis of the mounting plate 202 is consistent with the central axis of the invar ruler 1.

[0045] In one embodiment, the snap-fit ​​assembly 3 includes a limiting groove 301, which is formed at the top of the mounting plate 202. A snap-fit ​​piece 302 is slidably disposed inside the limiting groove 301. A snap-fit ​​groove 303 is formed on one side of the snap-fit ​​piece 302. The inside of the snap-fit ​​groove 303 is snap-fitted to the outer surface of the invar ruler 1. A handle 304 is fixedly connected to one side of the snap-fit ​​piece 302.

[0046] Because the outer surface of the snap-fit ​​piece 302 slides within the limiting groove 301, and the limiting groove 301 is located at the top of the mounting plate 202, pulling the handle 304 allows the snap-fit ​​piece 302, which is fixed on one side, to move along the direction of the limiting groove 301, so that the inner side of the snap-fit ​​piece 302 fits against the outer surface of the indium ruler 1. Then, pushing the handle 304 moves the snap-fit ​​piece 302 closer to the indium ruler 1, so that the snap-fit ​​piece 302 moves the snap-fit ​​groove 303 on one side, allowing the inside of the snap-fit ​​groove 303 to engage with the bolt cap installed inside the indium ruler 1. This allows the mounting plate 202 to be installed at one end of the indium ruler 1, facilitating the disassembly and installation of the indium ruler assembly used for leveling, thus improving its practicality.

[0047] In one embodiment, the guide component 4 includes a support base 401, the bottom end of which is fixedly connected to the top end of the mounting plate 202, a guide rod 402 is fixedly connected to one side of the support base 401, a connecting piece 403 is slidably connected to the outer surface of the guide rod 402, and one side of the connecting piece 403 is fixedly connected to one side of the snap-fit ​​piece 302.

[0048] A first tension spring 404 is sleeved on the outer surface of the guide rod 402, and one end of the first tension spring 404 is fixedly connected to one side of the connecting piece 403.

[0049] When the snap-fit ​​piece 302 moves, it drives the connecting piece 403 fixed on one side to move as well. This causes the connecting piece 403 to move along the direction of the internally sliding guide rod 402, while simultaneously stretching the first tension spring 404 fixed on one side. When the snap-fit ​​piece 302 loses tension, the contraction stress of the first tension spring 404 pulls the connecting piece 403 to move in the opposite direction along the guide rod 402. This causes the connecting piece 403 to pull the snap-fit ​​piece 302 to move in the opposite direction, while maintaining tension on one side of the snap-fit ​​piece 302 to prevent it from shaking or moving. This further improves the stability of the snap-fit ​​piece 302 when installed with the snap-fit ​​groove 303 and the invar ruler 1.

[0050] In one embodiment, the clamping assembly 5 includes a mounting block 501, the top end of the mounting block 501 is fixedly mounted to the bottom end of the mounting plate 202, a limiting rod 502 is fixedly connected inside the mounting block 501, a moving block 503 is slidably connected to the outer surface of the limiting rod 502, and a second tension spring 504 is fixedly connected to one side of the moving block 503.

[0051] The clamping assembly 5 also includes a support groove 505, which is located at the bottom of the mounting plate 202. A support block 506 is slidably connected inside the support groove 505. A clamping block 507 is fixedly connected to the bottom of the support block 506. One side of the clamping block 507 is fixedly connected to one side of the moving block 503. A guide groove 508 is provided on one side of the clamping block 507. A clamping groove 509 is provided inside the guide groove 508.

[0052] By pulling the clamping block 507, it moves along the direction of the support groove 505 that is slidably provided on the outer surface, in conjunction with the support block 506 fixed at the top. When the clamping block 507 moves, it can drive the moving block 503 fixed on one side to move. Since the inside of the moving block 503 is slidably connected to the outer surface of the limiting rod 502, and one side of the moving block 503 is fixedly connected to one end of the second tension spring 504, when the moving block 503 moves, it can drive the second tension spring 504 to stretch along the direction of the limiting rod 502. Thus, when the clamping block 507 is released, the second tension spring 504 pulls the moving block 503 to move in the opposite direction along the direction of the limiting rod 502, so that the moving block 503 drives the clamping block 507 fixed on one side to reset, thereby ensuring that the clamping block 507 always has tension.

[0053] In one embodiment, the extension component 6 includes a connecting plate 601, the outer surface of which is in contact with the interior of the clamping groove 509, and an extension rod 602 is fixedly connected to the bottom end of the connecting plate 601.

[0054] Since the clamping groove 509 is located inside the guide groove 508, by inserting one side of the connecting plate 601 into the guide groove 508 between the two sets of clamping blocks 507, and since the inside of the guide groove 508 is arc-shaped, when the connecting plate 601 is pushed to move, it can cooperate with the guide groove 508 to push the clamping block 507 to move. Thus, when the connecting plate 601 moves to one side of the clamping groove 509, the clamping block 507 is reset and moves to cooperate with the clamping groove 509 to clamp and fix the connecting plate 601, so as to restrict the extension rod 602 fixed at the bottom of the connecting plate 601. This makes it easier to disassemble and install the connecting plate 601 and the extension rod 602, and makes maintenance and replacement more convenient.

[0055] Through the above technical solution, 1. By pulling the snap-fit ​​component 3, it moves along the direction of the guide component 4 fixed on one side, so that the width between the snap-fit ​​components 3 is greater than the width of one end of the indium ruler 1. Then, the snap-fit ​​component 3 is fitted into one end of the indium ruler 1, so that the snap-fit ​​component 3 drives the positioning component 2, which is slidably set on the outer surface, to move closer to the end of the indium ruler 1, so that the inside of the positioning component 2 fits into the outer surface of the indium ruler 1, thereby restricting the position of the positioning component 2. Then, the snap-fit ​​component 3 is released, so that it is reset with the pulling force applied by the guide component 4, so that the snap-fit ​​component 3 snaps into the outer surface of the indium ruler 1 during the reset process, so that the positioning component 2 can be installed at one end of the indium ruler 1. The positioning component 2, together with the clamping component 5 installed at the bottom, restricts the center position of the extension component 6, so that the central axis between the extension component 6 and the indium ruler 1 is consistent, so that the indium ruler 1 can cooperate with the extension component 6 to penetrate into the protective box and contact the observation point, without having to remove the protective box.

[0056] 2. By pulling the handle 304, the locking piece 302 fixed on one side can be moved along the direction of the limiting groove 301 so that the inner side of the locking piece 302 is in contact with the outer surface of the indium ruler 1. Then, by pushing the handle 304, the locking piece 302 is moved closer to the indium ruler 1 so that the locking piece 302 can move the locking groove 303 opened on one side so that the inside of the locking groove 303 can engage with the bolt cap installed inside the indium ruler 1. This allows the mounting plate 202 to be installed on one end of the indium ruler 1, which facilitates the disassembly and installation of the indium ruler assembly used for leveling, thus improving its practicality.

[0057] 3. By inserting one side of the connecting plate 601 into the guide groove 508 between the two sets of clamping blocks 507, since the inside of the guide groove 508 is arc-shaped, when the connecting plate 601 is pushed to move, it can cooperate with the guide groove 508 to push the clamping block 507 to move. Thus, when the connecting plate 601 moves to one side of the clamping groove 509, the clamping block 507 is reset and moves to cooperate with the clamping groove 509 to clamp and fix the connecting plate 601, so as to restrict the extension rod 602 fixed at the bottom of the connecting plate 601. This makes it easier to disassemble and install the connecting plate 601 and the extension rod 602, and is more convenient for maintenance and replacement.

[0058] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0059] The preferred embodiments of the utility model disclosed above are merely illustrative of the utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the utility model, thereby enabling those skilled in the art to better understand and utilize it. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. An invar tape assembly for leveling, comprising an invar tape (1), characterized in that: The Invar ruler (1) is provided with a positioning component (2), a snap-fit ​​component (3), a guide component (4), a clamping component (5), and an extension component (6); The positioning component (2) is fitted inside the indium ruler (1) so that the indium ruler (1) restricts the position of the positioning component (2); The snap-fit ​​assembly (3) is internally snap-fitted to the outer surface of the invar ruler (1) so that the snap-fit ​​assembly (3) cooperates with the invar ruler (1) to restrict the position of the positioning assembly (2); A guide component (4) is fixedly connected to one side of the snap-fit ​​component (3) so that the guide component (4) guides the movement direction of the snap-fit ​​component (3) and provides a pulling force to the snap-fit ​​component (3); The clamping component (5) is fitted with the outer surface of the extension component (6) to clamp and fix the extension component (6) of the clamping component (5).

2. An indium rod level assembly for use in leveling according to claim 1, wherein, The positioning component (2) includes a positioning sleeve (201), the inside of which is fitted onto the outer surface of the Invar ruler (1), and a mounting plate (202) is fixedly connected to the bottom end of the positioning sleeve (201).

3. An indium rod level assembly for use in surveying, according to claim 2, wherein, The snap-fit ​​assembly (3) includes a limiting groove (301), which is located at the top of the mounting plate (202). A snap-fit ​​piece (302) is slidably disposed inside the limiting groove (301). A snap-fit ​​groove (303) is provided on one side of the snap-fit ​​piece (302). The inside of the snap-fit ​​groove (303) is snap-fitted to the outer surface of the Invar ruler (1). A handle (304) is fixedly connected to one side of the snap-fit ​​piece (302).

4. An indium rod level assembly for use in surveying according to claim 3 wherein, The guide assembly (4) includes a support base (401), the bottom end of which is fixedly connected to the top end of the mounting plate (202), a guide rod (402) is fixedly connected to one side of the support base (401), a connecting piece (403) is slidably connected to the outer surface of the guide rod (402), and one side of the connecting piece (403) is fixedly connected to one side of the snap-fit ​​piece (302). A first tension spring (404) is sleeved on the outer surface of the guide rod (402), and one end of the first tension spring (404) is fixedly connected to one side of the connecting piece (403).

5. An indium rod level assembly for use in leveling according to claim 2, wherein, The clamping assembly (5) includes a mounting block (501), the top end of which is fixedly mounted to the bottom end of the mounting plate (202). A limit rod (502) is fixedly connected inside the mounting block (501), and a moving block (503) is slidably connected to the outer surface of the limit rod (502). A second tension spring (504) is fixedly connected to one side of the moving block (503).

6. An indium rod level assembly for use in surveying according to claim 5 wherein, The clamping assembly (5) also includes a support groove (505), which is located at the bottom of the mounting plate (202). A support block (506) is slidably connected inside the support groove (505). A clamping block (507) is fixedly connected to the bottom of the support block (506). One side of the clamping block (507) is fixedly connected to one side of the moving block (503). A guide groove (508) is provided on one side of the clamping block (507), and a clamping groove (509) is provided inside the guide groove (508).

7. An indium rod level assembly for use in surveying, according to claim 6, wherein, The extension assembly (6) includes a connecting plate (601), the outer surface of which fits into the interior of the clamping groove (509), and an extension rod (602) is fixedly connected to the bottom end of the connecting plate (601).

Images