Mounting structure of concrete test block anti-permeability instrument

Abstract

The utility model discloses a mounting structure of a concrete test block anti-permeability instrument, and belongs to the technical field of engineering concrete detection. Comprising a machine body, a test module and a mounting assembly, the upper surface of the machine body is connected with the test modules through bolts, and the test modules are distributed in a rectangular array; the mounting assembly is fixedly mounted at the top of the machine body, and the test module is located between the mounting assembly and the machine body; the mounting assembly comprises a pneumatic telescopic rod and a top plate; the bottom of the pneumatic telescopic rod is fixedly connected with the machine body, and the pneumatic telescopic rod is located on the side face of the test die set. The top of the pneumatic telescopic rod is fixedly connected with a top plate, and the top plate is located over the test die set. The bottom of the top plate is fixedly provided with a plurality of operation arms, the operation arms are distributed in a rectangular array, and the operation arms are in one-to-one correspondence with the test modules and are suspended above the test modules; according to the mounting structure of the concrete test block anti-permeability instrument, the problem that assembly and disassembly are troublesome due to the fact that all bolts need to be screwed in sequence is solved.

Description

Technical Field

[0001] This application relates to the technical field of engineering concrete testing, and specifically to an installation structure for a concrete test block impermeability tester. Background Technique

[0002] The impermeability performance of concrete refers to the ability of the materials used in structures to resist the penetration of water and / or other liquid media under pressure.

[0003] Conventional impermeability testers on the market place the concrete in a test mold and fix the test mold to the top of the permeation body with a flange plate through multiple bolts, and then complete the permeation test. Since multiple data are required to support the test permeation, multiple concrete specimens need to be synchronously tested; when loading and unloading the test mold, each bolt needs to be tightened and loosened, which will delay a large amount of testing time and thus delay the subsequent work progress.

[0004] Therefore, it is necessary to provide an installation structure for a concrete test block impermeability tester to solve the above problems.

[0005] It should be noted that the above information disclosed in this background technique section is only used to understand the background technique of the concept of this application, and therefore, it may include information that does not constitute the prior art. Summary of the Invention

[0006] Based on the above problems existing in the prior art, the problem to be solved by this application is: to provide an installation structure for a concrete test block impermeability tester, which solves the problem of troublesome loading and unloading due to the need to tighten each bolt in sequence.

[0007] The technical solution adopted by this application to solve its technical problems is: an installation structure for a concrete test block impermeability tester, including a machine body, a test module group, and an installation component; the upper surface of the machine body is connected to the test module group by bolts, and the test module group is distributed in a rectangular array; the installation component is fixedly installed on the top of the machine body, and the test module group is located between the installation component and the machine body;

[0008] The installation component includes a pneumatic telescopic rod and a top plate; the bottom of the pneumatic telescopic rod is fixedly connected to the machine body, and the pneumatic telescopic rod is located on the side of the test module group; the top of the pneumatic telescopic rod is fixedly connected to the top plate, and the top plate is located directly above the test module group; a plurality of operating arms are fixedly installed at the bottom of the top plate, the operating arms are distributed in a rectangular array, the operating arms correspond to the test module group one by one, and are suspended above the test module group; thus, the pneumatic telescopic rod controls the up and down movement of the top plate, and further controls the distance between the operating arm and the test module group, leaving an operating space for the taking and placing of the test mold; at the same time, the top plate controls the simultaneous movement of a plurality of operating arms to realize the synchronous installation of the test module group, achieving the effect of time and labor saving.

[0009] Furthermore, the robotic arm includes a fixed seat and a control member; the top of the fixed seat is fixedly installed with the top plate, and the fixed seat is located above the mold test unit corresponding to the test mold; a plurality of driving rods are evenly arranged at the bottom of the fixed seat, and the plurality of driving rods are arranged circumferentially; a connecting cylinder is respectively installed on the outer side of each driving rod through a sliding connection, and the connecting cylinder is located below the fixed seat; a receiving cylinder is slidably connected to the outer side of the end of the connecting cylinder away from the driving rod, and the inside of the receiving cylinder is communicated with the inside of the connecting cylinder; the end of the receiving cylinder away from the connecting cylinder is connected to the control member through a bearing, and the end of the control member away from the receiving cylinder is snap-fitted with the bolt of the mold test unit corresponding to the test mold; thus, the fixed seat enables the plurality of control members to move synchronously through the driving rods, connecting cylinders, and receiving cylinders, so that each control member snaps onto a bolt, facilitating the subsequent synchronous tightening of the bolts; when the control member reaches the bolt, the driving rod, connecting cylinder, and receiving cylinder will gradually overlap, and the control member will gradually snap onto the bolt head, avoiding impact damage between the control member and the bolt head; when the driving rod and the connecting cylinder are completely overlapped, the pneumatic telescopic rod makes the top plate move downward by one unit and then move upward, thereby ensuring that the control member and the bolt can be tightly snap-fitted.

[0010] Furthermore, the other end of the control member is located inside the receiving cylinder, and a hollow hole is provided on the end face; a one-way bearing is installed at the hollow hole, and an execution seat is fixedly installed on the inner wall of the one-way bearing, and a twist groove is provided on the end face of the execution seat; thus, the control member is snap-fitted with the bolt head through the hexagonal groove, facilitating the subsequent control of the bolt rotation; the execution seat is installed through the one-way bearing, so that the execution seat can only rotate unidirectionally in the hollow hole.

[0011] Furthermore, the robotic arm further includes a receiving seat; a twist rod is provided at one end of the receiving seat close to the control member, a spring is fixedly installed on the outer side of the end of the control member located inside the receiving cylinder, the end of the spring away from the control member is installed with the receiving seat through a clearance fit, the twist rod is located inside the spring and does not contact the spring; thus, the spring is used to limit the distance between the receiving seat and the execution seat, avoiding being too far or too close.

[0012] Furthermore, one end of the driving rod is located inside the connecting cylinder, and a face ratchet one is provided at the end; a sliding groove is provided on the inner wall of the connecting cylinder, a support is installed inside the connecting cylinder, and the side of the support is a matching structure with the sliding groove; the inner wall of the support is snap-fitted with the receiving seat, and a face ratchet two is provided at one end of the receiving seat close to the driving rod; the face ratchet one and the face ratchet two can be meshed; both the face ratchet one and the face ratchet two adopt a diagonal type; thus, the driving rod meshes the face ratchet two through the face ratchet one, restricting the rotation of the execution seat in one direction.

[0013] Furthermore, one end of the twist rod away from the receiving seat extends into the hollow hole, and the end face and the twist groove form a mating mechanism. Thus, the actuator seat is mated with the twist rod through the twist groove. When the twist rod and the actuator seat move, the actuator seat will receive a thrust force that moves along the spiral surface of the twist rod. Since the actuator seat is restricted by the control member and cannot swing, the thrust force is converted into a rotational force.

[0014] Furthermore, the axial length of the hollow hole is greater than the axial length of the twist rod, and the diameter of the end face of the hollow hole is greater than the maximum diameter of the twist rod.

[0015] Furthermore, the rotation direction of the one-way bearing is the same as the helix direction of the twist rod. Thus, when the twist rod moves downward, the actuator seat rotates, and the one-way bearing locks the actuator seat and the control member together, so that the control member rotates with the actuator seat.

[0016] Furthermore, a hexagonal groove is provided at one end of the control member away from the receiving cylinder. Thus, the hexagonal groove is used for clamping the bolt.

[0017] The beneficial effects of the present application are as follows: An installation structure of a concrete test block impermeability tester provided by the present application is provided with a disassembly and assembly component. The operating arm rotates the bolt, and the pneumatic telescopic rod controls the up and down movement of the top plate, thereby controlling the distance between the operating arm and the test module group, leaving an operating space for the taking and placing of the test mold. At the same time, the top plate controls the simultaneous movement of multiple operating arms to achieve the synchronous installation of the test module group, ensuring that the test mold and the machine body can be closely fitted, preventing side leakage at the connection between the bottom of the test mold and the machine body. And installing multiple bolts simultaneously can quickly install the test module group, solving the problem of troublesome loading and unloading due to the need to tighten each bolt sequentially.

[0018] In addition to the purposes, features, and advantages described above, the present application has other purposes, features, and advantages. The following will refer to the drawings for a further detailed description of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The attached drawings forming a part of the present application are used to provide a further understanding of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation of the present application.

[0020] In the drawings:

[0021] Figure 1 is an overall schematic diagram of an installation structure of a concrete test block impermeability tester in the present application;

[0022] Figure 2 is Figure 1 a three-dimensional schematic diagram of the installation component in;

[0023] Figure 3 is Figure 2Schematic perspective view of the middle operating arm;

[0024] Figure 4 Cross-sectional view of the drive rod, connecting cylinder, receiving cylinder, and control component assembly;

[0025] Figure 5 Schematic perspective view of the drive rod structure;

[0026] Figure 6 Cross-sectional view of the connecting cylinder structure;

[0027] Figure 7 Assembly drawing of the control component and the actuator seat (fully sectioned control component);

[0028] Figure 8 Schematic perspective view of the actuator seat structure;

[0029] Figure 9 Assembly drawing of the receiving seat and the twist drill rod;

[0030] Among them, the reference numerals in the figure:

[0031] 1, body; 2, test module group; 3, installation component; 31, pneumatic telescopic rod; 32, top plate; 33, operating arm; 331, fixed seat; 332, drive rod; 3321, first end face ratchet; 333, connecting cylinder; 3331, sliding groove; 3332, support; 334, receiving cylinder; 335, control component; 3351, hexagonal groove; 3352, hollow hole; 336, receiving seat; 3361, second end face ratchet; 337, twist drill rod; 338, actuator seat; 3381, twist groove; 339, spring. Detailed implementation manners

[0032] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The following will describe this application in detail with reference to the drawings and in combination with the embodiments.

[0033] In order to enable those skilled in the art to better understand the solution of this application, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0034] As Figures 1-9 shown, this application provides an installation structure for a concrete test block impermeability tester. Referring to Figure 1, including a machine body 1, a test module group 2, and a mounting component 3; the upper surface of the machine body 1 is bolted to the test module group 2, and the test module group 2 is distributed in a rectangular array; the mounting component 3 is fixedly installed on the top of the machine body 1, and the test module group 2 is located between the mounting component 3 and the machine body 1;

[0035] Refer to Figure 2 , the mounting component 3 includes a pneumatic telescopic rod 31 and a top plate 32; the bottom of the pneumatic telescopic rod 31 is fixedly connected to the machine body 1, and the pneumatic telescopic rod 31 is located on the side of the test module group 2; the top of the pneumatic telescopic rod 31 is fixedly connected to the top plate 32, and the top plate 32 is located directly above the test module group 2; a plurality of operating arms 33 are fixedly installed at the bottom of the top plate 32, the operating arms 33 are distributed in a rectangular array, the operating arms 33 correspond to the test module group 2 one by one, and are suspended above the test module group 2; thus, the pneumatic telescopic rod 31 controls the up and down movement of the top plate 32, and further controls the distance between the operating arms 33 and the test module group 2, leaving an operating space for the taking and placing of the test mold; at the same time, the top plate 32 controls the simultaneous movement of the plurality of operating arms 33 to achieve synchronous installation of the test module group 2, achieving the effect of saving time and effort.

[0036] Refer to Figure 1 , Figure 3 , the operating arm 33 includes a fixed seat 331 and a control member 335; the top of the fixed seat 331 is fixedly installed on the top plate 32, and the fixed seat 331 is located above the test mold corresponding to the test module group 2; a plurality of driving rods 332 are uniformly arranged at the bottom of the fixed seat 331, and the plurality of driving rods 332 are arranged circumferentially; a connecting cylinder 333 is respectively installed on the outside of each driving rod 332 through a sliding connection, and the connecting cylinder 333 is located below the fixed seat 331; a receiving cylinder 334 is slidably connected to the outside of the end of the connecting cylinder 333 away from the driving rod 332, and the inside of the receiving cylinder 334 is communicated with the inside of the connecting cylinder 333; the end of the receiving cylinder 334 away from the connecting cylinder 333 is connected to the control member 335 through a bearing, and the end of the control member 335 away from the receiving cylinder 334 is bolted to the test mold corresponding to the test module group 2; thus, the corresponding test mold is located inside the plurality of receiving cylinders 334; the fixed seat 331 makes the plurality of control members 335 move synchronously through the driving rods 332, the connecting cylinders 333, and the receiving cylinders 334, so that each control member 335 clamps a bolt, facilitating the subsequent synchronous tightening of the bolts; when the control member 335 reaches the bolt, the driving rods 332, the connecting cylinders 333, and the receiving cylinders 334 will gradually overlap, and the control member 335 will gradually engage with the bolt head, avoiding impact damage between the control member 335 and the bolt head; when the driving rod 332 and the connecting cylinder 333 are completely overlapped, the pneumatic telescopic rod 31 makes the top plate 32 continue to move down one unit and then move up, so as to ensure that the control member 335 and the bolt can be tightly clamped.

[0037] Among them: Refer to Figure 4 , Figure 7 , Figure 8, the other end of the control member 335 is located inside the receiving cylinder 334, and a hollow hole 3352 is provided on the end face; a one-way bearing is installed at the hollow hole 3352, and an execution seat 338 is fixedly installed on the inner wall of the one-way bearing. A twist groove 3381 is provided on the end face of the execution seat 338; thus, the control member 335 is clamped with the bolt head through the hexagonal groove 3351, which is convenient for controlling the rotation of the bolt in the later stage; the execution seat 338 is installed through the one-way bearing, so that the execution seat 338 can only rotate unidirectionally in the hollow hole 3352.

[0038] In addition: Refer to Figure 4 、 Figure 9 , the operating arm 33 further includes a receiving seat 336; a twist rod 337 is provided at one end of the receiving seat 336 close to the control member 335. A spring 339 is fixedly installed on the outer side of one end of the control member 335 located inside the receiving cylinder 334. One end of the spring 339 away from the control member 335 is installed with the receiving seat 336 through clearance fit. The twist rod 337 is located inside the spring 339 and does not contact the spring 339; thus, the spring 339 is used to limit the distance between the receiving seat 336 and the execution seat 338 to avoid being too far or too close.

[0039] Refer to Figure 4 、 Figure 5 、 Figure 6 、 Figure 9 , one end of the driving rod 332 is located inside the connecting cylinder 333, and a first end face ratchet 3321 is provided at the end; a sliding groove 3331 is provided on the inner wall of the connecting cylinder 333, and a support 3332 is installed inside the connecting cylinder 333. The side surface of the support 3332 and the sliding groove 3331 are a matching structure; the inner wall of the support 3332 is clamped with the receiving seat 336, and a second end face ratchet 3361 is provided at one end of the receiving seat 336 close to the driving rod 332; the first end face ratchet 3321 and the second end face ratchet 3361 can be engaged; both the first end face ratchet 3321 and the second end face ratchet 3361 adopt an inclined line type; thus, the driving rod 332 limits the rotation of the execution seat 338 in one direction through the engagement of the first end face ratchet 3321 and the second end face ratchet 3361;

[0040] Refer to Figure 4 、 Figure 7 , one end of the twist rod 337 away from the receiving seat 336 extends into the hollow hole 3352, and the end face and the twist groove 3381 are a matching mechanism; thus, the execution seat 338 is matched with the twist rod 337 through the twist groove 3381. When the twist rod 337 and the execution seat 338 move, the execution seat 338 will receive a thrust moving along the spiral surface of the twist rod 337; since the execution seat 338 is limited by the control member 335 and cannot swing, the thrust is converted into a rotational force.

[0041] Wherein: the axial length of the hollow hole 3352 is greater than the axial length of the twist drill rod 337, and the end face diameter of the hollow hole 3352 is greater than the longest diameter of the twist drill rod 337.

[0042] The rotation direction of the one-way bearing is the same as the helix direction of the twist drill rod 337; thus, when the twist drill rod 337 moves downward, the actuator seat 338 rotates, and the one-way bearing locks the actuator seat 338 and the control member 335 together, so that the control member 335 rotates following the actuator seat 338.

[0043] A hexagonal groove 3351 is formed at one end of the control member 335 away from the receiving cylinder 334; thus, the hexagonal groove 3351 is used for clamping bolts.

[0044] The working process is as follows: the staff first forms concrete of different proportions through a mold, and then installs the concrete test blocks of different proportions in the test molds one by one; then places all the test molds at the test ports on the top of the corresponding body 1 one by one; then synchronously connects multiple test molds to the body 1 through the installation component 3; thus, the installation time of the test molds and the body 1 is saved, the preliminary installation work of the concrete test block impermeability tester is indirectly saved, and the work intensity of the testing personnel is reduced.

[0045] Wherein: the overall work of the installation component 3 is that the pneumatic telescopic rod 31 pulls the top plate 32 downward, and multiple operating arms 33 on the top plate 32 move downward. The multiple operating arms 33 correspond to the test molds one by one and simultaneously tighten the bolts, so as to realize the simultaneous installation of multiple test molds.

[0046] The working process of the above-mentioned operating arm 33 is as follows: The fixed seat 331 moves downward following the top plate 32, causing multiple driving rods 332 to move downward synchronously. The driving rods 332 control the corresponding connecting cylinders 333, receiving cylinders 334, and control members 335 to move downward to the mold testing position, so that the mold to be tested is located between multiple receiving cylinders 334, and the control member 335 is clamped with the bolt head at the mold testing position; the fixed seat 331 continues to move downward, and the receiving cylinder 334 stops moving, causing the connecting cylinder 333 to slide inside the receiving cylinder 334; when the connecting cylinder 333 and the receiving cylinder 334 are completely overlapped, the receiving seat 336 located inside the connecting cylinder 333 moves from the bottom of the connecting cylinder 333 to the upper part of the connecting cylinder 333 along the chute 3331 due to the connection between the twist rod 337 and the actuator seat 338 inside the receiving cylinder 334; subsequently, the fixed seat 331 pushes the driving rod 332 to slide inside the connecting cylinder 333, causing the end face ratchet one 3321 to engage with the end face ratchet two 3361; the spring 339 strengthens the tightness of the connection between the end face ratchet one 3321 and the end face ratchet two 3361; the fixed seat 331 continues to push the driving rod 332 downward, and the receiving seat 336 pushes the twist rod 337 downward, compressing the spring 339; the twist rod 337 pushes the actuator seat 338 to rotate inside the hollow hole 3352 of the control member 335. At this time, the one-way bearing enables the actuator seat 338 and the control member 335 to rotate synchronously, and the control member 335 drives the bolt to rotate, thereby realizing the installation of the bolt. Among them: When the bolt rotates and moves downward, at this time, the control member 335 is pushed downward by the spring 339.

[0047] When the twist rod 337 moves downward to the lower dead center, the top plate 32 drives the fixed seat 332 to move upward. The receiving seat 336 is no longer subjected to the downward pressure of the driving rod 332. The spring 339 pushes the receiving seat 336 upward, and the twist rod 337 drives the actuator seat 338 to rotate in the reverse direction. At this time, the one-way bearing separates the actuator seat 338 from the control member 335, so that the control member 335 does not rotate accordingly; when the spring 339 returns to its original state, the top plate 32 drives the fixed seat to move downward again, and this reciprocating operation is carried out until the bolt is completely connected to the machine body 1; it should be noted that the upward displacement of the pneumatic telescopic rod 31 is smaller than the previous one each time.

[0048] To sum up, by using the installation component 3 to replace manual tightening of each bolt in sequence, it saves time and effort; moreover, the deviation degree of the bolt tightening degree of a single mold to be tested is relatively small, so that there will be no side leakage at the connection between the mold to be tested and the machine body 1, reducing the large error in the single-group value of the subsequent penetration test.

[0049] It should be noted that the parts not involved in the present invention are the same as or can be implemented by the prior art; the one-way bearing in the present invention can be implemented by the existing structure.

[0050] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. An installation structure of an impermeability tester for concrete test blocks, characterized in that: It includes a machine body (1), a test module group (2), and a mounting component (3); the upper surface of the machine body (1) is bolted to the test module group (2), and the test module groups (2) are distributed in a rectangular array; the mounting component (3) is fixedly installed on the top of the machine body (1), and the test module group (2) is located between the mounting component (3) and the machine body (1). The mounting component (3) includes a pneumatic telescopic rod (31) and a top plate (32); the bottom of the pneumatic telescopic rod (31) is fixedly connected to the machine body (1), and the pneumatic telescopic rod (31) is located on the side of the test module group (2); the top of the pneumatic telescopic rod (31) is fixedly connected to the top plate (32), and the top plate (32) is located directly above the test module group (2); a plurality of operating arms (33) are fixedly installed at the bottom of the top plate (32), the operating arms (33) are distributed in a rectangular array, the operating arms (33) correspond to the test module group (2) one by one, and are suspended above the test module group (2).

2. The installation structure of a concrete specimen impermeability tester according to claim 1, characterized in that: The operating arm (33) includes a fixed seat (331) and a control member (335); the top of the fixed seat (331) is fixedly installed on the top plate (32), and the fixed seat (331) is located above the corresponding test mold of the test module group (2); a plurality of driving rods (332) are evenly arranged at the bottom of the fixed seat (331), and the plurality of driving rods (332) are arranged circumferentially. A connecting cylinder (333) is respectively installed on the outside of each driving rod (332) through a sliding connection, and the connecting cylinder (333) is located below the fixed seat (331); a receiving cylinder (334) is slidably connected to the outside of the end of the connecting cylinder (333) away from the driving rod (332), and the inside of the receiving cylinder (334) is communicated with the inside of the connecting cylinder (333); the end of the receiving cylinder (334) away from the connecting cylinder (333) is connected to the control member (335) through a bearing, and the end of the control member (335) away from the receiving cylinder (334) is bolted to the corresponding test mold of the test module group (2).

3. The installation structure of a concrete specimen impermeability tester according to claim 2, characterized in that: The other end of the control member (335) is located inside the receiving cylinder (334), and a hollow hole (3352) is opened on the end face; a one-way bearing is installed at the hollow hole (3352), and an execution seat (338) is fixedly installed on the inner wall of the one-way bearing, and a twist groove (3381) is opened on the end face of the execution seat (338).

4. The installation structure of a concrete specimen impermeability tester according to claim 3, characterized in that: The operating arm (33) further includes a receiving seat (336); a twist rod (337) is arranged at one end of the receiving seat (336) close to the control member (335), a spring (339) is fixedly installed on the outside of the end of the control member (335) located inside the receiving cylinder (334), the end of the spring (339) away from the control member (335) is installed with the receiving seat (336) through a clearance fit, the twist rod (337) is located inside the spring (339) and does not contact the spring (339).

5. The installation structure of a concrete specimen impermeability tester according to claim 4, characterized in that: One end of the driving rod (332) is located inside the connecting cylinder (333), and a first end face ratchet wheel (3321) is arranged at the end; a sliding groove (3331) is formed in the inner wall of the connecting cylinder (333), a support (3332) is installed inside the connecting cylinder (333), and the side surface of the support (3332) is in a matching structure with the sliding groove (3331); The inner wall of the support (3332) is clamped with the receiving seat (336), and a second end face ratchet wheel (3361) is arranged at one end of the receiving seat (336) close to the driving rod (332); the first end face ratchet wheel (3321) and the second end face ratchet wheel (3361) can be meshed; both the first end face ratchet wheel (3321) and the second end face ratchet wheel (3361) are of an oblique line type.

6. The installation structure of a concrete specimen impermeability tester according to claim 5, characterized in that: One end of the twist rod (337) far from the receiving seat (336) extends into the hollow hole (3352), and the end face is in a matching mechanism with the twist groove (3381).

7. The installation structure of a concrete specimen impermeability tester according to claim 6, characterized in that: The axial length of the hollow hole (3352) is greater than the axial length of the twist rod (337), and the end face diameter of the hollow hole (3352) is greater than the longest diameter of the twist rod (337).

8. The installation structure of a concrete specimen impermeability tester according to claim 7, characterized in that: The rotation direction of the one-way bearing is the same as the spiral direction of the twist rod (337).

9. The installation structure of a concrete specimen impermeability tester according to claim 8, characterized in that: A hexagonal groove (3351) is formed at one end of the control part (335) far from the receiving cylinder (334).

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