A brake cylinder test fixture

Abstract

The utility model relates to the technical field of automobile brake cylinder test, and disclose a kind of brake cylinder test tool, main body adjusting assembly is equipped with dynamic quick cycle test component in its inside, the utility model provides a kind of brake cylinder test tool, different model brake cylinder is realized to the quick adaptation and reliable clamping of fixed clamping assembly, worm gear drive drives first, second rotating ring synchronous rotation, through the linkage structure of rotating sleeve and sliding clamping rod, make multiple sliding clamping rod along fixed axle self-adapting tension and close, the clamping surface of arc design can be closely attached to the outer wall of brake cylinder of different diameter, cooperate the screw rod adjusting function of main body adjusting assembly, different length specification test demand can be quickly adapted, solve the problem of poor versatility of traditional tool, change type time-consuming, reduce equipment investment cost and improve detection efficiency, solve the technical problem of poor versatility in prior art, change type time-consuming.

Description

Technical Field

[0001] This utility model relates to the field of automotive brake cylinder testing technology, and more specifically, to a brake cylinder testing fixture. Background Technology

[0002] In the research, development, production and quality inspection of automotive brake cylinders, the brake cylinder testing fixture plays a crucial role. As a key actuator of the automotive braking system, the performance of the brake cylinder directly affects the safety and reliability of the vehicle. After the production of automotive brake cylinders, the same batch of brake cylinders is usually sampled for inspection. The sampling inspection method is to repeatedly control the brake cylinder by pressing it, extending the push rod, and then pushing the rod back to its original position, repeating the cycle.

[0003] However, the fixing structure of brake cylinder testing fixtures is mostly a special fixture design, that is, a rigid clamping diameter and positioning distance are customized for a specific model of brake cylinder. When different models of brake cylinders need to be tested, the original fixture must be disassembled first, and then a new fixture of the corresponding size must be replaced. The entire changeover process requires manual adjustment of bolts and calibration of positioning reference, which is usually time-consuming. At the same time, although some fixtures attempt to achieve small-range size adaptation by adjusting bolts, they are limited by structural design and can only be compatible with one or two similar specifications of brake cylinders. Moreover, the coaxiality of the clamping will also be deviated after adjustment, affecting the testing accuracy. Utility Model Content

[0004] To overcome the above-mentioned defects, the embodiments of this utility model provide a brake cylinder testing fixture, which solves the technical problems of poor versatility and time-consuming changeover in the prior art.

[0005] According to one aspect, the present invention provides a brake cylinder testing fixture, including a main adjustment assembly, wherein a dynamic rapid cycle testing assembly is provided inside the main adjustment assembly, a fixing clamping assembly is also provided inside the main adjustment assembly, and a limiting plate is provided at one end of the main adjustment assembly;

[0006] The main adjustment assembly includes a pair of mounting housings. The lower end of the upper mounting housing is rotatably connected to a lead screw, and one end of the lead screw is fixedly connected to a first knob. Each of the pair of mounting housings has a sliding block slidably connected to one of their adjacent ends. The upper sliding block is installed in the middle of the lead screw by a screw sleeve. The lower mounting housing has a limit rod fixedly connected inside, and the middle of the limit rod is slidably connected to the lower sliding block.

[0007] According to another aspect, the present invention provides a dynamic rapid cycle test assembly comprising a pair of protective housings, each of the pair of protective housings being fixedly connected to one end of a pair of sliding blocks, the pair of protective housings being symmetrically arranged, a drive frame being fixedly connected to the lower end of the protective housings, a reciprocating moving block being slidably connected inside the drive frame, a connecting block being fixedly connected to the lower end of the reciprocating moving block, a connecting rod being fixedly connected to one end of the connecting block, and an abutment disc being fixedly connected to one end of the connecting rod.

[0008] According to another aspect, the present invention provides that the upper end of the reciprocating moving block is rotatably connected to a pair of mutually symmetrical eccentric driven gears, the inside of the protective shell is fixedly connected to a servo motor, the output end of the servo motor is fixedly connected to an eccentric driving gear, and the eccentric driving gear is meshed with a pair of eccentric driven gears.

[0009] According to another aspect, the present invention provides that the fixing clamping assembly includes a clamping housing fixedly connected between a pair of mounting housings, a worm gear rotatably connected inside the clamping housing, and a second knob fixedly connected to one end of the worm gear and located outside the clamping housing.

[0010] According to another aspect, the present invention provides that a fixed ring is fixedly connected inside the clamping shell, a first rotating ring is rotatably connected to the middle of the fixed ring, a second rotating ring is provided at one end of the first rotating ring, the second rotating ring and the first rotating ring are fixedly connected by multiple connecting shafts, and a worm gear is fixedly connected to the middle of the second rotating ring, the worm gear being meshed with a worm.

[0011] According to another aspect, the present invention provides that a plurality of rotating sleeves are rotatably connected between the first rotating ring and the second rotating ring, and a sliding clamping rod is slidably connected inside each of the plurality of rotating sleeves. One end of each of the plurality of sliding clamping rods is rotatably connected to a fixed shaft, and one end of each of the plurality of fixed shafts is fixedly connected to the middle of the fixed ring.

[0012] According to another aspect, the present invention provides that the limiting disc is fixedly connected between a pair of mounting housings.

[0013] According to another aspect, the present invention provides that the drive frame has a pair of mutually symmetrical sliding limiting grooves inside.

[0014] According to another aspect, the present invention provides that a pair of sliding limiting protrusions are fixedly connected to the middle of the reciprocating moving block.

[0015] According to another aspect, the present invention provides that the middle part of the sliding clamping rod is arranged in an arc shape.

[0016] The beneficial effects of this utility model are as follows:

[0017] 1. This utility model achieves rapid adaptation and reliable clamping of different models of brake cylinders through a fixed clamping assembly. A worm gear drive drives the first and second rotating rings to rotate synchronously. Through the linkage structure of the rotating sleeve and the sliding clamping rods, multiple sliding clamping rods adaptively open and close along a fixed axis. The arc-shaped clamping surface can closely fit the outer wall of brake cylinders of different diameters. Combined with the lead screw adjustment function of the main adjustment assembly, it can quickly adapt to the testing requirements of different length specifications, solving the problems of poor versatility and time-consuming changeover of traditional tooling, reducing equipment investment costs and improving testing efficiency.

[0018] 2. This utility model achieves precise simulation of high-frequency cyclic action of the brake cylinder through a dynamic rapid cycle test component. The servo motor drives the meshing transmission of the eccentric active gear and the eccentric driven gear, which can stably output high-frequency reciprocating motion. With the sliding limit structure of the drive frame and the reciprocating moving block, it ensures that the force of the abutment disc on the brake cylinder push rod is uniform and stable. At the same time, compared with the push rod test, the high-frequency reciprocating motion is faster and can reach the test number more times, improving the time utilization rate. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this utility model and these drawings without any creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure in one embodiment of the present invention;

[0021] Figure 2 This is a cross-sectional view of the mounting shell structure in one embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the disassembled structure of the dynamic fast cycle test component in one embodiment of the present invention;

[0023] Figure 4 This is a cross-sectional view of the drive frame in one embodiment of the present invention;

[0024] Figure 5 This is a schematic cross-sectional view of the clamping shell structure in one embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of the disassembled structure of the fixing and clamping assembly in one embodiment of the present invention;

[0026] Figure 7 This is a schematic diagram of the first rotating ring structure in one embodiment of the present invention;

[0027] In the diagram: 1. Main adjustment assembly; 2. Dynamic rapid cycle test assembly; 3. Fixed clamping assembly; 4. Limiting plate; 101. Mounting housing; 102. Lead screw; 103. First knob; 104. Sliding block; 105. Limiting rod; 201. Drive frame; 202. Protective housing; 203. Reciprocating moving block; 204. Connecting block; 205. Connecting rod; 206. Abutting disc; 207. Eccentric driven gear; 208. Servo motor; 209. Eccentric driving gear; 301. Clamping housing; 302. Worm gear; 303. Second knob; 304. Fixed ring; 305. First rotating ring; 306. Second rotating ring; 307. Worm gear; 308. Connecting shaft; 309. Rotating sleeve; 310. Sliding clamping rod; 311. Fixed shaft. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit its scope.

[0029] To keep the drawings concise, only the parts relevant to the utility model are shown schematically in each drawing; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "a" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0030] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0032] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element 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 this utility model.

[0033] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0034] like Figures 1 to 7 As shown, this utility model provides a brake cylinder test fixture, including a main adjustment assembly 1, a dynamic rapid cycle test assembly 2 inside the main adjustment assembly 1, a fixing clamping assembly 3 inside the main adjustment assembly 1, and a limiting plate 4 at one end of the main adjustment assembly 1.

[0035] The main adjustment assembly 1 includes a pair of mounting housings 101. The lower end of the upper mounting housing 101 is rotatably connected to a lead screw 102. One end of the lead screw 102 is fixedly connected to a first knob 103. Each of the pair of mounting housings 101 is slidably connected to a sliding block 104 at one end close to the other. The upper sliding block 104 is installed in the middle of the lead screw 102 by a screw sleeve. The lower mounting housing 101 is fixedly connected to a limit rod 105. The middle part of the limit rod 105 is slidably connected to the lower sliding block 104.

[0036] Rotating the first knob 103 causes the lead screw 102 to rotate. Utilizing the threaded engagement between the lead screw 102 and the upper sliding block 104, the upper sliding block 104 moves axially along the lead screw 102. Simultaneously, the lower limiting rod 105 guides and limits the lower sliding block 104, enabling the pair of sliding blocks 104 to move synchronously. Ultimately, this completes the adjustment of the position of the dynamic rapid cycle test component 2 to adapt to the testing requirements of brake cylinders of different lengths.

[0037] The dynamic rapid cycle test component 2 includes a pair of protective shells 202, which are fixedly connected to one end of a pair of sliding blocks 104 respectively. The pair of protective shells 202 are symmetrically arranged. A drive frame 201 is fixedly connected to the lower end of the protective shell 202. A reciprocating moving block 203 is slidably connected inside the drive frame 201. A connecting block 204 is fixedly connected to the lower end of the reciprocating moving block 203. A connecting rod 205 is fixedly connected to one end of the connecting block 204. An abutting disc 206 is fixedly connected to one end of the connecting rod 205.

[0038] The servo motor 208 drives the eccentric drive gear 209 at the output end to rotate. The eccentric drive gear 209 meshes with a pair of eccentric driven gears 207, driving the pair of eccentric driven gears 207 to rotate synchronously. The eccentric structure of the eccentric drive gear 209 and eccentric driven gears 207 generates a reciprocating force that drives the reciprocating moving block 203. The servo motor 208 is a Panasonic A6 series MSMF042L1U2M or a similar domestic model such as the Huichuan IS620N series, with a rated power of 400W, a rated speed of 3000r / min, and a rated torque of 1.27N·m. The control method is pulse position mode + torque limiting mode. The eccentric drive gear 209 has a 2mm module (standard involute module), 20 teeth, 5mm eccentricity, and a 20° standard pressure angle. The eccentric driven gear 207 has a 2mm module, 30 teeth, a 1.0 standard value, and a 20° standard pressure angle.

[0039] Among them, the upper end of the reciprocating moving block 203 is rotatably connected to a pair of symmetrical eccentric driven gears 207, the inside of the protective shell 202 is fixedly connected to a servo motor 208, the output end of the servo motor 208 is fixedly connected to an eccentric driving gear 209, and the eccentric driving gear 209 is meshed with a pair of eccentric driven gears 207.

[0040] The reciprocating moving block 203 drives the lower fixed connecting block 204, the connecting block 204 drives the connecting rod 205, and the connecting rod 205 drives the abutting disc 206 at one end to reciprocate synchronously. Finally, the abutting disc 206 repeatedly pushes the brake cylinder push rod, simulating the "push rod extension-return" cycle action of the brake cylinder, and achieving the effect of dynamic rapid cycle test.

[0041] The fixed clamping assembly 3 includes a clamping housing 301 fixedly connected between a pair of mounting housings 101. A worm gear 302 is rotatably connected inside the clamping housing 301. A second knob 303 is fixedly connected to one end of the worm gear 302 and located outside the clamping housing 301.

[0042] Rotating the second knob 303 causes the worm gear 302 to rotate. The meshing connection between the worm gear 302 and the worm wheel 307 drives the worm wheel 307 to rotate the second rotating ring 306. Since the second rotating ring 306 is fixed to the first rotating ring 305 through multiple connecting shafts 308, and the first rotating ring 305 is rotatably connected to the middle of the fixed ring 304, the first rotating ring 305 and the second rotating ring 306 rotate synchronously.

[0043] The clamping housing 301 has a fixed ring 304 fixedly connected inside, and a first rotating ring 305 is rotatably connected to the middle of the fixed ring 304. A second rotating ring 306 is provided at one end of the first rotating ring 305. The second rotating ring 306 and the first rotating ring 305 are fixedly connected through multiple connecting shafts 308. A worm gear 307 is fixedly connected to the middle of the second rotating ring 306. The worm gear 307 is meshed with the worm 302.

[0044] The clamping housing 301 is fixedly connected between a pair of mounting housings 101, providing a mounting and protective carrier for parts such as the worm gear 302, the fixed ring 304, and the first rotating ring 305, ensuring the overall structural stability of the fixed clamping assembly 3.

[0045] Among them, a plurality of rotating sleeves 309 are rotatably connected between the first rotating ring 305 and the second rotating ring 306. Each of the plurality of rotating sleeves 309 is slidably connected to a sliding clamping rod 310. One end of each of the plurality of sliding clamping rods 310 is rotatably connected to a fixed shaft 311. One end of each of the plurality of fixed shafts 311 is fixedly connected to the middle part of the fixed ring 304.

[0046] The first rotating ring 305 and the second rotating ring 306 rotate synchronously, causing the multiple rotating sleeves 309 connected between them to deflect. The rotating sleeves 309 push the sliding clamping rods 310 that are internally slidably connected, causing the sliding clamping rods 310 to swing around the fixed shaft 311 that is slidably connected at one end. The other end of the fixed shaft 311 is fixed to the middle of the fixed ring 304, so as to realize the adaptive opening and closing of the multiple sliding clamping rods 310.

[0047] The limiting plate 4 is fixedly connected between a pair of mounting housings 101.

[0048] The rear end of the brake cylinder can be limited by the limiting disc 4.

[0049] The drive frame 201 has a pair of symmetrical sliding limit grooves inside.

[0050] The sliding limit groove limits the sliding of the reciprocating moving block 203, thereby increasing its stability.

[0051] Among them, a pair of sliding limit protrusions are fixedly connected to the middle of the reciprocating moving block 203.

[0052] Stability is increased by matching the sliding limit protrusion with the sliding limit groove.

[0053] The middle part of the sliding clamping rod 310 is arc-shaped.

[0054] The clamping effect is improved by conforming to the curved surface of the brake cylinder.

[0055] Working principle and usage process of this utility model:

[0056] When using this brake cylinder test fixture, the brake cylinder must first be fixedly clamped: the operator rotates the second knob 303 on the outside of the clamping housing 301 in the fixed clamping assembly 3. The second knob 303 drives the worm gear 302 rotatably connected inside the clamping housing 301 to rotate. Since the worm gear 302 meshes with the worm wheel 307 fixedly connected to the middle of the second rotating ring 306, the worm wheel 307 rotates with the worm gear 302 and drives the second rotating ring 306 to rotate synchronously. Furthermore, since the second rotating ring 306 is connected by multiple links... The connecting shaft 308 is fixedly connected to the first rotating ring 305, and the first rotating ring 305 is rotatably connected to the middle of the fixed ring 304 inside the clamping housing 301. Therefore, the first rotating ring 305 and the second rotating ring 306 rotate synchronously. As the first rotating ring 305 and the second rotating ring 306 rotate, the multiple rotating sleeves 309 rotatably connected between them deflect accordingly. The sliding clamping rod 310 slidably connected inside the rotating sleeve 309 is driven by it to rotate around the fixed shaft rotatably connected to one end of itself. The other end of the 311 swinging fixed shaft is fixed to the middle of the fixed ring 304. At this time, multiple sliding clamping rods 310 adaptively open and close along the fixed shaft 311. In addition, the middle of the sliding clamping rod 310 is arc-shaped, and its arc-shaped clamping surface can closely fit the outer wall of brake cylinders of different diameters, thus achieving reliable clamping of different models of brake cylinders. If the length specifications of the brake cylinders are different, the test position needs to be adjusted through the main body adjustment component 1. The operator rotates the first knob 103 at one end of the upper mounting shell 101. 103 drives the lead screw 102, which is rotatably connected to the lower end of the upper mounting housing 101, to rotate. The sliding block 104, which is slidably connected to one end of the upper mounting housing 101 near the lower mounting housing 101, is installed in the middle of the lead screw 102 through a screw sleeve. When the lead screw 102 rotates, it drives the sliding block 104 to move along the axial direction of the lead screw 102. At the same time, the limiting rod 105 fixed inside the lower mounting housing 101 plays a guiding and limiting role on the lower sliding block 104, so that the lower sliding block 104 moves synchronously with the upper sliding block 104.During the movement of a pair of sliding blocks 104, the dynamic rapid cycle test component 2 adjusts its position. This, combined with the limiting disc 4 fixed between a pair of mounting housings 101, limits one end of the brake cylinder, quickly adapting to the testing requirements of brake cylinders of different lengths. After the brake cylinder is fixed and its position adjusted, the dynamic rapid cycle test component 2 is activated for testing. The servo motor 208 fixed inside the protective housing 202 is powered on and operates. Its output drives the eccentric drive gear 209 to rotate. The eccentric drive gear 209 meshes with a pair of eccentric driven gears 207 rotatably connected to the upper end of the reciprocating moving block 203, causing the pair of eccentric driven gears 207 to rotate synchronously. Since both the eccentric drive gear 209 and the eccentric driven gear 207 are... The eccentric structure, when the two parts mesh and rotate, generates an eccentric force that pushes the reciprocating moving block 203 to slide inside the drive frame 201. The sliding limiting groove inside the drive frame 201 cooperates with the sliding limiting protrusion fixed in the middle of the reciprocating moving block 203, ensuring the stable sliding of the reciprocating moving block 203 and enabling the reciprocating moving block 203 to perform high-frequency reciprocating motion. The connecting block 204 fixed at the lower end of the reciprocating moving block 203 moves synchronously with it. The connecting rod 205 fixed at one end of the connecting block 204 drives the abutment disc 206 at one end to move back and forth. The abutment disc 206 repeatedly pushes the push rod of the brake cylinder, simulating the "push rod extension-return" cycle of the brake cylinder, ultimately realizing the dynamic rapid cycle test of the brake cylinder.

[0057] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A brake cylinder testing fixture, comprising a main adjustment assembly (1), characterized in that: The main body adjustment component (1) is provided with a dynamic rapid cycle test component (2) inside, and a fixed clamping component (3) is also provided inside the main body adjustment component (1). A limiting plate (4) is provided at one end of the main body adjustment component (1). The main adjustment assembly (1) includes a pair of mounting housings (101). The lower end of the upper mounting housing (101) is rotatably connected to a lead screw (102). One end of the lead screw (102) is fixedly connected to a first knob (103). The pair of mounting housings (101) are slidably connected to sliding blocks (104) at their close ends. The upper sliding block (104) is installed in the middle of the lead screw (102) by a screw sleeve. The lower mounting housing (101) is fixedly connected to a limit rod (105). The middle part of the limit rod (105) is slidably connected to the lower sliding block (104).

2. The brake cylinder testing fixture according to claim 1, characterized in that: The dynamic rapid cycle test assembly (2) includes a pair of protective shells (202), each of which is fixedly connected to one end of a pair of sliding blocks (104). The pair of protective shells (202) are arranged symmetrically. A drive frame (201) is fixedly connected to the lower end of the protective shell (202). A reciprocating moving block (203) is slidably connected inside the drive frame (201). A connecting block (204) is fixedly connected to the lower end of the reciprocating moving block (203). A connecting rod (205) is fixedly connected to one end of the connecting block (204). An abutting disc (206) is fixedly connected to one end of the connecting rod (205).

3. The brake cylinder testing fixture according to claim 2, characterized in that: The upper end of the reciprocating moving block (203) is rotatably connected to a pair of symmetrical eccentric driven gears (207). The inside of the protective shell (202) is fixedly connected to a servo motor (208). The output end of the servo motor (208) is fixedly connected to an eccentric driving gear (209). The eccentric driving gear (209) meshes with a pair of eccentric driven gears (207).

4. The brake cylinder testing fixture according to claim 1, characterized in that: The fixed clamping assembly (3) includes a clamping housing (301) fixedly connected between a pair of mounting housings (101), a worm gear (302) is rotatably connected inside the clamping housing (301), and a second knob (303) is fixedly connected at one end of the worm gear (302) and located outside the clamping housing (301).

5. The brake cylinder testing fixture according to claim 4, characterized in that: A fixed ring (304) is fixedly connected inside the clamping housing (301). A first rotating ring (305) is rotatably connected to the middle of the fixed ring (304). A second rotating ring (306) is provided at one end of the first rotating ring (305). The second rotating ring (306) and the first rotating ring (305) are fixedly connected through multiple connecting shafts (308). A worm gear (307) is fixedly connected to the middle of the second rotating ring (306). The worm gear (307) is meshed with the worm (302).

6. The brake cylinder testing fixture according to claim 5, characterized in that: A plurality of rotating sleeves (309) are rotatably connected between the first rotating ring (305) and the second rotating ring (306). Each of the plurality of rotating sleeves (309) is slidably connected to a sliding clamping rod (310). One end of each of the plurality of sliding clamping rods (310) is rotatably connected to a fixed shaft (311). One end of each of the plurality of fixed shafts (311) is fixedly connected to the middle part of the fixed ring (304).

7. The brake cylinder testing fixture according to claim 1, characterized in that: The limiting plate (4) is fixedly connected between a pair of mounting shells (101).

8. A brake cylinder testing fixture according to claim 2, characterized in that: The drive frame (201) has a pair of symmetrical sliding limit grooves inside.

9. A brake cylinder testing fixture according to claim 2, characterized in that: A pair of sliding limiting protrusions are fixedly connected to the middle of the reciprocating moving block (203).

10. A brake cylinder testing fixture according to claim 6, characterized in that: The middle part of the sliding clamping rod (310) is arc-shaped.

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