Capacitor aluminum shell clamping device

Abstract

The invention provides a capacitor aluminum shell clamping device, and relates to the technical field of capacitor aluminum shell clamping, the capacitor aluminum shell clamping device comprises a collecting pipe installed on a fixing frame, the collecting pipe is in threaded connection with two flow slowing pipes, the flow slowing pipes are in threaded connection with threaded rings, the threaded rings are in sliding connection with follow-up sleeves, and the follow-up sleeves are in sliding connection with the follow-up sleeves. The capacitor aluminum shell clamping device comprises a follow-up sleeve, a flow slowing pipe is arranged in the follow-up sleeve, a control disc is fixedly arranged in the flow slowing pipe, a flow blocking disc is arranged on the follow-up sleeve, the flow blocking disc is attached to the control disc, a conical groove is formed in the flow blocking disc, and a threaded pipe is connected into the follow-up sleeve in a threaded mode. Through a liquid flow control and pressure distribution mechanism, uniform clamping and pressure self-adaptive adjustment of the soft aluminum shell are achieved, and the common problem of local stress concentration in a traditional clamping device in the innovative design is solved.

Description

Technical Field

[0001] This invention relates to the field of capacitor aluminum shell clamping technology, and more specifically, to a capacitor aluminum shell clamping device. Background Technology

[0002] In existing technologies, the installation process of capacitor aluminum shells typically employs mechanical clamping to ensure the stability and precision of the installation process. This clamping and fixing method plays a crucial role in ensuring the installation effect, effectively preventing displacement or rotation of the aluminum shell during installation and ensuring the accuracy of the installation position. However, due to the inherent physical properties of the capacitor aluminum shell material, especially the relatively soft mechanical properties of aluminum, traditional clamping installation methods have revealed many technical defects in practical applications. Existing clamping devices often struggle to achieve uniform force distribution when applying clamping force, leading to stress concentration at the clamping point. This uneven stress distribution directly affects the structural integrity of the aluminum shell. Furthermore, traditional clamping methods lack control over the magnitude of the clamping force, with operators often relying on experience to judge the clamping force. This subjective operation further exacerbates the problem of uneven stress distribution, causing the aluminum shell to bear localized stresses exceeding its material bearing capacity during installation.

[0003] Due to the material properties of aluminum capacitor casings, their deformation sensitivity under external stress is inherent. When the local stress applied by the clamping device exceeds the elastic limit of aluminum, irreversible plastic deformation occurs on the surface of the casing, most directly manifested as noticeable dents. These dents not only affect the appearance of the capacitor but, more importantly, severely impact its functional performance. The reduced wall thickness in the dented area lowers the mechanical strength of that region, making it prone to fatigue crack initiation points during long-term use. In severe cases, this can lead to decreased sealing performance or even complete failure of the capacitor. Casing dents also alter the internal spatial distribution of the capacitor, affecting the normal flow and distribution of the electrolyte, thus impacting the capacitor's electrical performance and lifespan. Furthermore, the uneven surface caused by dents increases the difficulty of installing the capacitor on the circuit board, affecting soldering quality and the reliability of electrical connections. These issues ultimately affect the stability and reliability of the entire electronic device, severely restricting the market competitiveness and user satisfaction of capacitor products. Summary of the Invention

[0004] (a) Technical problems to be solved In view of the problems existing in the prior art, the present invention provides a capacitor aluminum shell clamping device to solve the technical problems mentioned in the background art.

[0005] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a capacitor aluminum shell clamping device, comprising a fixing frame; further comprising a flow-regulating mechanism, the flow-regulating mechanism comprising a manifold mounted on the fixing frame, two flow-regulating tubes threadedly connected to the manifold, and a threaded ring threadedly connected inside the flow-regulating tube, a follower sleeve slidably connected inside the threaded ring, a control disk fixedly installed inside the flow-regulating tube, a flow-blocking disk installed on the follower sleeve, the flow-blocking disk being attached to the control disk, a tapered groove being formed on the flow-blocking disk, a threaded tube threadedly connected inside the follower sleeve, an internal rod coaxially arranged inside the threaded tube, and a tapered rod installed on the internal rod; further comprising a clamping mechanism, the clamping mechanism comprising a clamping plate, multiple telescopic sleeves equally spaced and interconnected on the clamping plate, each telescopic sleeve being slidably and sealingly connected to a telescopic rod, and a push spring installed on the telescopic rod.

[0006] Preferably, the flow control mechanism includes a slot formed between the threaded tube and the internal rod, and multiple lateral holes are equally spaced on the side wall of the follower sleeve. The lateral holes connect the two sides of the follower sleeve. This multi-channel hydraulic diversion design creates an efficient liquid circulation system, and the slot forms an annular flow space between the threaded tube and the internal rod.

[0007] Preferably, the outer wall of the follower sleeve is provided with multiple guide grooves, and the inner wall of the threaded ring is provided with multiple guide strips at equal intervals. The guide strips are slidably connected in the guide grooves. This precise guiding and positioning system forms a highly stable axial motion control mechanism. The uniform distribution of multiple guide grooves on the outer wall of the follower sleeve ensures the coaxiality and stability of the follower sleeve during the movement process, and prevents movement instability and sealing failure caused by eccentricity.

[0008] Preferably, a sealing spring and a preload spring are installed on the threaded ring. The sealing spring abuts against the control disc, and the inner diameter of the sealing spring is larger than the outer diameter of the baffle disc. The preload spring is located inside the sealing spring and abuts against the baffle disc. This dual elastic sealing structure constructs a highly reliable adaptive pressure control system. The abutting design between the sealing spring and the control disc forms the first sealing barrier, preventing hydraulic oil from leaking from the contact surface under high pressure. The special design that the inner diameter of the sealing spring is larger than the outer diameter of the baffle disc creates a differential sealing structure, ensuring good sealing performance under different working pressures. The nested design of the preload spring located inside the sealing spring forms a series elastic support system.

[0009] Preferably, a stop sleeve is coaxially installed inside the flow-retardant tube, and an indicator rod is slidably connected inside the stop sleeve. A rotating disk is coaxially installed on the upper part of the indicator rod. This precise status indication system forms an intuitive and visible adjustment feedback mechanism. The coaxial installation design of the stop sleeve and the flow-retardant tube ensures the accurate positioning and stable operation of the indication system, avoiding indication errors caused by eccentric installation. The sealed sliding connection between the indicator rod and the stop sleeve creates a leak-free motion transmission structure, while ensuring the smoothness and sensitivity of the indicator rod's movement.

[0010] Preferably, the indicator rod is coaxially connected to the inner rod, a cone is mounted on the inner rod, and a stop groove is provided on the stop sleeve. This integrated transmission and limiting system constructs an efficient state monitoring and protection mechanism. The coaxial connection design between the indicator rod and the inner rod enables the accurate transmission of the internal adjustment state, ensuring the consistency between the external display and the actual internal state. The installation design of the cone on the inner rod creates a reliable sealing structure.

[0011] Preferably, the slow-flow pipe is connected to two vertical pipes, and a fixed plate is connected to both vertical pipes. A position indicator ring is coaxially installed at the other end of the slow-flow pipe. This multi-channel hydraulic distribution system forms an efficient fluid delivery network. The connection and installation design between the two vertical pipes and the slow-flow pipe creates a branched hydraulic oil distribution structure, ensuring that the hydraulic oil can be evenly distributed to different parts of the system. The fixed plate on the vertical pipe constructs a stable connection platform.

[0012] Preferably, the clamping mechanism further includes a rotating shaft mounted on the fixed frame, on which two symmetrically arranged clamps are rotatably connected. A cylinder is fixedly mounted on the fixed frame, and two push blocks are rotatably connected to the extended end of the cylinder, and the push blocks are rotatably connected to the clamps. This symmetrical and balanced mechanical drive system constructs a stable and reliable clamping execution mechanism.

[0013] Preferably, a rotating bolt is rotatably connected to the clamp, the rotating bolt is threaded to the clamp plate, two balance springs are installed on each clamp plate, and the balance springs abut against the clamp respectively. Flexible hoses are installed on the two sets of telescopic sleeves respectively, and a sealing head is installed at the other end of the flexible hose. The sealing head is threaded to the fixed plate.

[0014] Preferably, a bend is connected to the manifold, an air inlet pipe is connected to the cylinder, a transverse pipe is installed on the side wall of the air inlet pipe, the bend is connected to the transverse pipe, and a cut-off rod is slidably connected inside the transverse pipe. This automatic protection system establishes a safe and reliable pressure control mechanism, and the connection and installation design of the manifold and the bend creates a return channel for hydraulic oil.

[0015] (III) Beneficial Effects Compared with the prior art, the present invention provides a capacitor aluminum shell clamping device, which has the following advantages: The core innovation of this capacitor aluminum shell clamping device lies in its integrated hydraulic adjustment system. Through liquid flow control and pressure distribution mechanism, it achieves uniform clamping and adaptive pressure adjustment of the soft aluminum shell. This innovative design cleverly solves the common problem of local stress concentration in clamping devices and effectively prevents the aluminum shell from denting and deforming during clamping. The system adopts a composite hydraulic control structure combining manifold and slow-flow pipe. Through a carefully designed flow resistance adjustment device, it ensures that hydraulic oil flows preferentially among multiple telescopic sleeves, achieving uniform distribution of clamping force.

[0016] The combination of the conical rod and conical groove in the device forms an adjustable throttling control mechanism. By precisely adjusting the distance between the two, the system can automatically adjust the flow resistance of the hydraulic oil according to the different specifications of the aluminum shell of the capacitor, thereby controlling the pressure change rate during the clamping process. This throttling design ensures that in the initial stage of clamping, the telescopic rod can first adaptively position itself according to the curved shape of the aluminum shell to achieve full contact, and then increase the clamping force synchronously, avoiding stress concentration caused by uneven contact in traditional clamping methods.

[0017] The cooperation between the follower sleeve and the control panel forms a directional hydraulic valve, which generates a large flow resistance during the clamping process and a significant reduction in flow resistance during the release process. This unidirectional flow obstruction mechanism ensures precise control of the clamping process and a rapid response during the release process. The conical groove design on the flow obstruction plate and the conical rod on the internal rod form an adjustable flow channel space. By rotating the threaded tube, the operator can adjust the flow according to the material characteristics and shape and size of different capacitors, which improves the versatility and adaptability of the equipment.

[0018] The technological advantage of this device lies in its adaptive clamping system. Through the coordinated work of multiple telescopic rods and telescopic sleeves, it achieves all-round close clamping of the aluminum shell of the capacitor. When the clamping operation begins, the device first ensures that all telescopic rods are in uniform contact with the surface of the aluminum shell, rather than applying clamping force at the same time. This process is controlled by a hydraulic slow-flow mechanism, ensuring that only a very small amount of hydraulic oil flows out through the slow-flow tube, and most of the hydraulic oil circulates between multiple telescopic sleeves, driving the telescopic rods that have not yet contacted the aluminum shell to extend outward until all telescopic rods are in uniform contact with the surface of the aluminum shell.

[0019] When the clamping force reaches the preset threshold, hydraulic oil flows into the transverse tube through the slow-flow tube, which in turn pushes the cut-off rod against the air inlet tube to cut off the air source and automatically terminate the clamping process. This force control system effectively prevents the aluminum shell from being deformed and damaged due to excessive clamping. It eliminates the need for operators to subjectively judge the clamping force, thus improving the safety and reliability of the clamping process.

[0020] The dual sealing structure of the sealing spring and the preload spring ensures reliable sealing under high pressure conditions, preventing hydraulic oil leakage. The matching design of the guide bar and the guide groove ensures the stability and accuracy of the follower sleeve during movement, avoiding seal failure and component wear caused by eccentric movement. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of a capacitor aluminum shell clamping device according to the present invention; Figure 2 This is a schematic diagram of the structure of the clamping plate and telescopic rod in this invention; Figure 3 This is a schematic diagram of the flow-slowing tube in this invention; Figure 4 This is a cross-sectional view of the flow-slowing tube in this invention. Figure 5 This is a cross-sectional view of the threaded ring in this invention. Figure 6 This is a schematic diagram of the threaded tube structure in this invention; Figure 7 This is a schematic diagram of the structure of the follower sleeve and the flow-blocking disk in this invention; Figure 8 This is a schematic diagram of the threaded ring in this invention; Figure 9 This is a cross-sectional view of the intake pipe in this invention. Figure 10 This is a schematic diagram of the cylinder and pusher block in this invention.

[0022] In the diagram: 11. Fixing frame; 21. Manifold; 22. Flow-retarding pipe; 23. Threaded ring; 24. Follower sleeve; 25. Control panel; 26. Baffle plate; 27. Conical groove; 28. Threaded pipe; 29. ​​Internal rod; 31. Clamping plate; 32. Telescopic sleeve; 33. Telescopic rod; 34. Shaft; 35. Clamp; 36. Cylinder; 37. Push block; 38. Rotating bolt; 39. Balance spring; 210. Conical rod; 211. Hollowed-out groove; 212. Side 213. Guide groove; 214. Guide bar; 215. Sealing spring; 216. Preload spring; 217. Stop sleeve; 218. Indicator rod; 219. Rotary disk; 220. Cone head; 221. Stop groove; 222. Vertical tube; 223. Fixed disk; 224. Indicator ring; 310. Hose; 311. Sealing head; 312. Bend; 313. Inlet pipe; 314. Horizontal pipe; 315. Cut-off rod; 316. Push spring. Detailed Implementation

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0025] In this invention, unless otherwise stated, the directional terms such as "up" and "down" generally refer to the directions shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" generally refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0026] Please see Figures 1 to 10 A capacitor aluminum shell clamping device includes a fixing frame 11 and a flow-regulating mechanism. The flow-regulating mechanism includes a manifold 21 mounted on the fixing frame 11, two flow-regulating tubes 22 threadedly connected to the manifold 21, and a threaded ring 23 threadedly connected inside the flow-regulating tube 22. A follower sleeve 24 is slidably connected inside the threaded ring 23. A control panel 25 is fixedly installed inside the flow-regulating tube 22. A flow-blocking plate 26 is mounted on the follower sleeve 24 and fits against the control panel 25. A tapered groove 27 is provided on the sleeve 26. A threaded tube 28 is internally threaded to the follower sleeve 24. An internal rod 29 is coaxially arranged inside the threaded tube 28. A tapered rod 210 is installed on the internal rod 29. The flow control mechanism includes a hollow groove 211 formed between the threaded tube 28 and the internal rod 29. Multiple lateral holes 212 are equally spaced on the side wall of the follower sleeve 24, and the lateral holes 212 connect the two sides of the follower sleeve 24. Multiple guide grooves 213 are formed on the outer wall of the follower sleeve 24. Multiple guide strips 214 are evenly spaced on the inner wall of the threaded ring 23. The guide strips 214 are slidably connected in the guide groove 213. A sealing spring 215 and a preload spring 216 are installed on the threaded ring 23. The sealing spring 215 abuts against the control disc 25. The inner diameter of the sealing spring 215 is larger than the outer diameter of the flow-blocking disc 26. The preload spring 216 is located inside the sealing spring 215 and abuts against the flow-blocking disc 26. A stop sleeve 217 is coaxially installed inside the flow-slowing pipe 22. An indicator rod 218 is slidably connected to the inner seal of the 217. A rotating disk 219 is coaxially mounted on the upper part of the indicator rod 218. The indicator rod 218 is coaxially connected to the inner rod 29. A cone 220 is mounted on the inner rod 29. A stop groove 221 is opened on the stop sleeve 217. Two vertical pipes 222 are connected and installed in the flow-slowing pipe 22. A fixed disk 223 is connected and installed in the two vertical pipes 222. A position ring 224 is coaxially mounted on the other end of the flow-slowing pipe 22.

[0027] When clamping the housing, multiple telescopic rods 33 initially press against the housing. As the housing's surface curves, some rods are initially against the housing, while others are not yet pressed against it. Furthermore, the flow resistance of the flow-retardant tube 22 is very high at this point. Therefore, as the telescopic rods 33 compress, some hydraulic oil first flows through the multiple telescopic sleeves 32, causing the remaining rods 33 to push outwards and press against the outer wall of the housing. Only a very small amount of hydraulic oil flows out of the flow-retardant tube 22; the vast majority of the hydraulic oil... Hydraulic oil flows between multiple telescopic sleeves 32, causing multiple telescopic rods 33 to press against the side wall of the housing. When all the telescopic rods 33 press against the housing and clamping is performed, the push springs 316 on the multiple telescopic rods 33 are compressed synchronously. At this time, the hydraulic oil will flow outward and flow into the transverse pipe 314 through the slow flow pipe 22. Then, the cut-off rod 315 is pushed against the air intake pipe 313, causing the air intake pipe 313 to be cut off, and the air intake is stopped. Therefore, as long as the clamping force is large, it will automatically trigger the stop clamping, avoiding damage.

[0028] When hydraulic oil flows into the hose 310, it first flows into the follower sleeve 24 through the vertical pipe 222, and then into the follower sleeve 24 through the hollow groove 211 in the threaded pipe 28. Since the flow-blocking plate 26 is attached to the control plate 25, the flow direction through the hose 310 cannot pass through at this time, and it only flows out through the gap between the cone rod 210 and the cone groove 27. Since the gap between the cone rod 210 and the cone groove 27 is very small, a large flow resistance is generated, which ensures that the hydraulic oil flows in the multiple telescopic sleeves 32 first, and then flows out through the cone groove 27 after completing the adjustment in the telescopic sleeves 32. This ensures that clamping can be completed first and then stopped. Since the threaded pipe 28 is threadedly connected in the follower sleeve 24, the distance between the cone rod 210 and the cone groove 27 can be adjusted. When the distance between the two changes, the flow resistance will change, thereby adjusting the flow time in the multiple telescopic sleeves 32 to meet the requirements. As the internal rod 29 rotates, the current situation can be indicated by the indicator rod 218, thus ensuring that the adjustment is easy to display.

[0029] After clamping is completed, the two clamping plates 31 are released, and then the telescopic rod 33 is pushed outward by the push spring 316. As a result, the hydraulic oil flows in reverse and back into the telescopic sleeve 32. When reverse flow occurs, the flow-blocking plate 26 will open the seal between itself and the control plate 25. Therefore, the hydraulic oil will flow in reverse through the side hole 212 and through the hollow groove 211 into the hose 310 without resistance. Therefore, the reverse flow will cause the cone 220 to press against the stop groove 221, ensuring the sealing effect.

[0030] The clamping mechanism includes a clamping plate 31, on which multiple telescopic sleeves 32 are installed at equal intervals and are interconnected. Each telescopic sleeve 32 is slidably connected to a telescopic rod 33. The clamping mechanism also includes a rotating shaft 34 mounted on a fixed frame 11, on which two symmetrically arranged clamps 35 are rotatably connected. A cylinder 36 is fixedly mounted on the fixed frame 11, on which two push blocks 37 are rotatably connected, and the push blocks 37 are rotatably connected to the clamps 35. A rotating bolt 38 is rotatably connected to the clamps 35, and the rotating bolt 38 is threaded. On each clamp 31, two balance springs 39 are installed, and the balance springs 39 abut against the clamps 35. Two sets of telescopic sleeves 32 are connected to hoses 310. The other end of the hoses 310 is equipped with a sealing head 311, which is threaded to the fixed plate 223. A bend 312 is connected to the manifold 21. An air intake pipe 313 is connected to the cylinder 36. A transverse pipe 314 is installed on the side wall of the air intake pipe 313. The bend 312 is connected to the transverse pipe 314. A cut-off rod 315 is slidably connected inside the transverse pipe 314.

[0031] Of all the solutions mentioned above, those involving the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A capacitor aluminum shell clamping device, comprising a fixing frame (11); characterized in that: It also includes a flow-regulating mechanism, which includes a manifold (21) mounted on the fixed frame (11). Two flow-regulating tubes (22) are threadedly connected to the manifold (21), and a threaded ring (23) is threadedly connected inside the flow-regulating tube (22). A follower sleeve (24) is slidably connected inside the threaded ring (23). A control panel (25) is fixedly installed inside the flow-regulating tube (22). A flow-blocking plate (26) is installed on the follower sleeve (24). The flow-blocking plate (26) is attached to the control panel (25), and a cone is formed on the flow-blocking plate (26). The groove (27) is connected to the threaded tube (28) in the follower sleeve (24). An internal rod (29) is coaxially arranged inside the threaded tube (28). A tapered rod (210) is installed on the internal rod (29). The groove (27) also includes a clamping mechanism. The clamping mechanism includes a clamping plate (31). Multiple telescopic sleeves (32) are installed at equal intervals on the clamping plate (31). The multiple telescopic sleeves (32) are interconnected. Each telescopic sleeve (32) is sealed and slidably connected to a telescopic rod (33). A push spring (316) is installed on the telescopic rod (33).

2. The capacitor aluminum shell clamping device according to claim 1, characterized in that: The flow control mechanism includes a slot (211) between the threaded tube (28) and the internal rod (29), and a plurality of lateral holes (212) are equally spaced on the side wall of the follower sleeve (24), the lateral holes (212) connecting the two sides of the follower sleeve (24).

3. The capacitor aluminum shell clamping device according to claim 2, characterized in that: The outer wall of the follower sleeve (24) is provided with multiple guide grooves (213), and multiple guide strips (214) are installed at equal intervals on the inner wall of the threaded ring (23). The guide strips (214) are slidably connected in the guide grooves (213).

4. The capacitor aluminum shell clamping device according to claim 3, characterized in that: A sealing spring (215) and a preload spring (216) are installed on the threaded ring (23). The sealing spring (215) abuts against the control disc (25). The inner diameter of the sealing spring (215) is larger than the outer diameter of the flow-blocking disc (26). The preload spring (216) is located inside the sealing spring (215) and abuts against the flow-blocking disc (26).

5. The capacitor aluminum shell clamping device according to claim 4, characterized in that: A stop sleeve (217) is coaxially installed inside the slow-flow tube (22), and an indicator rod (218) is slidably connected inside the stop sleeve (217). A rotating disk (219) is coaxially installed on the upper part of the indicator rod (218).

6. The capacitor aluminum shell clamping device according to claim 5, characterized in that: The indicator rod (218) is coaxially connected to the inner rod (29), and a cone (220) is installed on the inner rod (29). A stop groove (221) is provided on the stop sleeve (217).

7. A capacitor aluminum shell clamping device according to claim 6, characterized in that: The slow-flow tube (22) is connected to two vertical tubes (222), and a fixed plate (223) is connected to the two vertical tubes (222). A position indicator ring (224) is coaxially installed at the other end of the slow-flow tube (22).

8. A capacitor aluminum shell clamping device according to claim 7, characterized in that: The clamping mechanism also includes a rotating shaft (34) mounted on the fixed frame (11), on which two symmetrically arranged clamps (35) are rotatably connected. A cylinder (36) is fixedly mounted on the fixed frame (11), and two push blocks (37) are rotatably connected to the extended end of the cylinder (36), and the push blocks (37) are rotatably connected to the clamps (35).

9. A capacitor aluminum shell clamping device according to claim 8, characterized in that: A rotating bolt (38) is rotatably connected to the clamp (35), and the rotating bolt (38) is threadedly connected to the clamp plate (31). Two balance springs (39) are installed on each clamp plate (31), and the balance springs (39) abut against the clamp (35). Two sets of telescopic sleeves (32) are respectively connected to a hose (310), and a sealing head (311) is installed at the other end of the hose (310). The sealing head (311) is threadedly connected to the fixed plate (223).

10. A capacitor aluminum shell clamping device according to claim 9, characterized in that: A bend (312) is connected to the manifold (21), an intake pipe (313) is connected to the cylinder (36), a transverse pipe (314) is installed on the side wall of the intake pipe (313), the bend (312) is connected to the transverse pipe (314), and a cut-off rod (315) is slidably connected inside the transverse pipe (314).

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