Numerical control hydraulic flat plate high-speed punching and drilling compound machine

Abstract

The invention relates to the technical field of flat plate punching and drilling, and discloses a numerical control hydraulic flat plate high-speed punching and drilling compound machine which comprises a first base, a compound mechanism, a first horizontal moving device and a second horizontal moving device, the top of the first base is fixedly connected with a workbench, and the outer wall of the first base is fixedly connected with the first horizontal moving device. The inner wall of the sliding U-shaped plate is movably connected with a first horizontal moving device, the left side of the top of the sliding U-shaped plate is fixedly connected with a downward pressing assembly, the right side of the top of the sliding U-shaped plate is fixedly connected with an adjusting assembly, and by arranging a switching assembly, the working mode of the equipment can be adjusted in a switching mode. When the working mode is changed, the machining positions of the equipment are located at the same position, the situation that the punching device and the drilling device are separately arranged at two positions, and consequently machining of the equipment cannot be accurately positioned is avoided, and the machining effect of the equipment is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of flat plate punching and drilling, in particular to a numerically controlled hydraulic flat plate high-speed punching and drilling compound machine. Background Art

[0002] In modern industrial production, mechanical processing technology continues to develop and progress. As the manufacturing industry's requirements for component processing accuracy, efficiency and versatility continue to increase, traditional single-function processing equipment can no longer meet complex production needs. For sheet metal processing, punching and drilling are common processing operations. In the past, punching machines and drilling machines were usually independent devices that performed punching and drilling operations respectively.

[0003] The patent application with application number CN201520478222.4 discloses a CNC hydraulic flatbed high-speed punching and drilling compound machine, including: a bed, a workbench arranged on the bed, a hydraulic punching unit vertically installed on the bed and located above the workbench, a spindle box vertically slidably installed on the bed and located above the workbench through a guide rail, a power device driving the spindle box to move up and down, a spindle vertically rotated and installed in the spindle box, a tool handle installed below the spindle, and a tool rod installed below the tool handle, and the spindle is connected to the driving motor by transmission. The plate material that needs to be processed with holes is placed on the workbench. For thin plates, punching processing can be performed by the hydraulic punching unit, and for thick plates, the driving motor drives the spindle to drive the tool handle to rotate, so that the tool rod rotates to achieve drilling. During drilling, the power device drives the spindle box to move downward, so that the drilling depth can be controlled, so that the plate can be conveniently selected for punching or drilling processing according to different thicknesses, thereby improving the processing efficiency.

[0004] When using existing equipment, most of them simply combine a drilling machine and a punching machine together, which results in the equipment having two sets of calculation methods for the plate processing position, one for detecting the drilling position and the other for detecting the punching position. This makes the equipment's calculation too complicated, prone to errors and failures, and is not conducive to the equipment's processing of the plate. Summary of the invention

[0005] The purpose of the present invention is to provide a numerically controlled hydraulic flat plate high-speed punching and drilling compound machine to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a CNC hydraulic flat plate high-speed punching and drilling compound machine, comprising a base 1, a workbench is fixedly connected to the top of the base 1, a horizontal moving device 1 is fixedly connected to the outer wall of the base 1, and further comprising: A composite mechanism, wherein the composite mechanism plate is a sliding U-shaped plate, the inner wall of the sliding U-shaped plate is movably connected to a horizontal moving device, the left side of the top of the sliding U-shaped plate is fixedly connected with a pressing component, and the right side of the top of the sliding U-shaped plate is fixedly connected with an adjusting component.

[0007] According to the above technical solution, the pressing component includes a base 2, the bottom of which is fixedly connected to the sliding U-shaped plate, the top of which is fixedly connected to a vertical moving device, the side of the vertical moving device close to the adjustment component is movably connected to a horizontal moving device 2, the bottom of the horizontal moving device 2 is movably connected to a movable component, and the end of the horizontal moving device 2 away from the vertical moving device is fixedly connected to a push rod, wherein the push rod is used to apply pressure to the top of the sliding column 3.

[0008] According to the above technical solution, the movable component includes a sliding seat 1, the outer wall of the sliding seat 1 is movably connected to the horizontal moving device 2, the bottom of the sliding seat 1 is fixedly connected to a connecting plate 1, the bottom of the connecting plate 1 is fixedly connected to a pressure column on one side close to the adjustment component, and the connecting plate 1 is fixedly connected to a support plate on the side away from the pressure column, wherein the support plate is used to strengthen the strength of the connecting plate 1 to prevent the connecting plate 1 from bending, and the top of the support plate is fixedly connected to the sliding seat 1.

[0009] According to the above technical solution, the inner wall of the connecting plate 1 is movably connected with a positioning column, and the end of the positioning column away from the pressure column is fixedly connected with a circular plate 1, and the outer wall of the positioning column is sleeved with a spring 1, one end of the spring 1 is fixedly connected to a circular plate 1, and the end of the spring 1 away from the circular plate 1 is fixedly connected to a connecting plate 1. When the equipment needs to switch the processing structure, the movable component will move outward. At this time, as the movable component moves, the equipment will limit the moving range of the processing mechanism, and then release the connection between the movable component and the processing structure, thereby ensuring smooth switching of the processing equipment and ensuring the stability of the equipment operation.

[0010] According to the above technical scheme, the adjustment component includes a base three, the bottom of the base three is fixedly connected to the sliding U-shaped plate, the top of the base three is fixedly connected to a forward and backward moving device, the inner wall of the forward and backward moving device is movably connected to a switching component, the forward and backward movement of the switching component is controlled by the forward and backward moving device, and the corresponding processing structure is moved to the top of the track one, the side of the forward and backward moving device close to the pressing component is fixedly connected to the track one, the inner wall of the track one is provided with a sliding groove, and the inner wall of the sliding groove is fixedly connected to a sliding column one.

[0011] According to the above technical solution, the outer wall of the sliding column one is movably connected with the sliding block one, the outer wall of the sliding column one is sleeved with a spring two, the top of the spring two is fixedly connected with the sliding block one, the bottom of the spring two is fixedly connected with the sliding groove, the outer wall of the sliding block one is fixedly connected with a T-plate, both ends of the T-plate are fixedly connected with a hollow plate, the inner wall of the track one is movably connected with the hollow plate, before the movable component is connected to the processing structure, the T-plate is restricted by the locking column, so that the processing structure cannot descend, and after the connection, the height of the processing structure is controlled by the movable component.

[0012] The cam is connected with the base three by the spring, and the two ends of the spring are connected with the spring clips, and the two ends of the spring clips are connected with the spring clips respectively.

[0013] According to the above technical solution, the switching component includes a base 4, a slider 2 is fixedly connected to the bottom of the base 4, the outer wall of the slider 2 is movably connected to the front and rear moving device, the left and right ends of the base 4 close to the movable component are fixedly connected to the track 2, and the inner walls of the two tracks 2 are movably connected to the sliding seat 2. By setting the switching component, the device can adjust the working mode in a switching manner. While changing the working mode, the processing position of the equipment is in the same place, avoiding the equipment processing from being unable to be accurately positioned due to the punching device and the drilling device being set in two places, thereby ensuring the processing effect of the equipment, the two sliding seats 2 are provided with positioning holes on the side away from the track 2, the inner wall of the sliding seat 2 on the right side is fixedly connected to a motor, and the output end of the motor is fixedly connected to a drill bit, and the inner wall of the sliding seat 2 on the left side is fixedly connected to a sleeve, and the inner wall of the sleeve is movably connected to a sliding column 3, the bottom of the sliding column 3 is fixedly connected to a punching drill bit, and the bottom of the sliding column 3 is fixedly connected to a spring 4, and the bottom of the spring 4 is fixedly connected to the sleeve.

[0014] Compared with the prior art, the beneficial effects achieved by the present invention are: 1. The present invention sets a switching component to allow the device to adjust the working mode by switching. While changing the working mode, the processing position of the device is in the same place, avoiding the inability to accurately position the device processing due to the punching device and the drilling device being set in two places, thereby ensuring the processing effect of the device.

[0015] 2. The present invention sets an adjustment component to ensure that the processing mechanism will not automatically fall along the track when the equipment switches the processing mode, ensure the smooth switching of the equipment and ensure the stability of the equipment operation.

[0016] 3. The present invention sets an adjustment component to fix the position of the equipment processing structure before the movable component is connected to the processing structure. After the movable component is connected to the processing structure, the restriction on the processing structure is automatically released to ensure smooth switching of the equipment and stable operation of the equipment.

[0017] 4. The present invention sets a movable component. When the equipment needs to switch the processing structure, the movable component will move outward. At this time, as the movable component moves, the equipment will limit the moving range of the processing mechanism, and then release the connection between the movable component and the processing structure, ensuring smooth switching of the equipment and ensuring the stability of the equipment operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the composite mechanism of the present invention; Figure 3 is a schematic diagram of a pressing assembly of the present invention; Figure 4 is a schematic diagram of the active components of the present invention; Figure 5 is a schematic diagram of the regulating assembly of the present invention; Figure 6 It is a schematic diagram of the bottom structure of the adjustment component of the present invention; Figure 7 is a cross-sectional view of the bottom structure of the adjustment assembly of the present invention; Figure 8 It is a schematic diagram of a T-plate of the present invention; Fig. 9 is a schematic diagram of the internal parts of the adjustment assembly of the present invention; Fig.10 is a schematic diagram of a switching assembly of the present invention; Fig.11is a schematic diagram of the external structure of the switching component of the present invention; Fig.12 is a second cross-sectional view of the sliding seat of the present invention; In the figure: 1, base 1; 101, workbench; 102, horizontal moving device 1; 2, composite mechanism; 201, sliding U-shaped plate; 21, pressing assembly; 211, base 2; 212, vertical moving device; 213, horizontal moving device 2; 214, push rod; 22, movable assembly; 221, sliding seat 1; 222, connecting plate 1; 223, pressure column; 224, support plate; 225, positioning column; 226, circular plate 1; 227, spring 1; 23, adjustment assembly; 231, base 3; 232, forward and backward moving device; 233, track 1; 234, slideway; 2 35. Sliding column one; 236. Sliding block one; 237. Spring two; 238. T-plate; 239. Hollow plate; 2310. Force plate; 2311. Sliding column two; 2312. Round plate two; 2313. Spring three; 2314. Connecting column; 2315. Connecting plate two; 2316. Locking column; 24. Switching assembly; 241. Base four; 242. Sliding block two; 243. Track two; 244. Sliding seat two; 245. Positioning hole; 246. Motor; 247. Drill bit; 248. Sleeve; 249. Sliding column three; 2410. Punching head; 2411. Spring four. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0021] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] Example 1: See Figure 1-Figure 4The present invention provides a technical solution: a CNC hydraulic flat plate high-speed punching and drilling compound machine, comprising a base 1, a workbench 101 is fixedly connected to the top of the base 1, a horizontal moving device 102 is fixedly connected to the outer wall of the base 1, and further comprising: Composite mechanism 2, composite mechanism 2 plate sliding U-shaped plate 201, the inner wall of the sliding U-shaped plate 201 is movably connected to the horizontal moving device 102, the left side of the top of the sliding U-shaped plate 201 is fixedly connected with a pressing component 21, and the right side of the top of the sliding U-shaped plate 201 is fixedly connected with an adjusting component 23.

[0023] The pressing component 21 includes a base 211, the bottom of which is fixedly connected to the sliding U-shaped plate 201, the top of which is fixedly connected to a vertical moving device 212, the side of the vertical moving device 212 close to the adjusting component 23 is movably connected to a horizontal moving device 213, the bottom of the horizontal moving device 213 is movably connected to the movable component 22, and the end of the horizontal moving device 213 away from the vertical moving device 212 is fixedly connected to a push rod 214, when the device is drilling a hole in a plate, the push rod 214 will not work, and when the device is punching a hole in a plate, the push rod 214 will extend downward to apply pressure to the top of the drilling mechanism.

[0024] The movable component 22 includes a sliding seat 221, the outer wall of the sliding seat 221 is movably connected to the horizontal moving device 213, the bottom of the sliding seat 221 is fixedly connected to a connecting plate 222, the bottom of the connecting plate 222 is fixedly connected to a pressure column 223 on one side close to the adjusting component 23, the connecting plate 222 is fixedly connected to a support plate 224 on the side away from the pressure column 223, the top of the support plate 224 is fixedly connected to the sliding seat 221, the inner wall of the connecting plate 222 is movably connected to a positioning column 225, the end of the positioning column 225 away from the pressure column 223 is fixedly connected to a circular plate 226, the outer wall of the positioning column 225 is sleeved with a spring 227, one end of the spring 227 is fixedly connected to the circular plate 226, and the end of the spring 227 away from the circular plate 226 is fixedly connected to the connecting plate 222.

[0025] The working principle of this embodiment is as follows: when the plate needs to be processed, the corresponding processing mechanism is moved to the corresponding position through the adjustment component 23, and then the horizontal moving device 213 is started to drive the sliding seat 221 to move toward the processing structure. As the sliding seat 221 moves, the connecting plate 222 is driven to move, and the moving connecting plate drives the positioning column 225 to connect with the processing structure, and the pressure column 223 is used to release the restriction of the adjustment component 23 on the processing mechanism, and then the processing mechanism is started again, and the processing structure is driven by the vertical moving device 212 to process the plate.

[0026] Example 2: Based on Example 1, please refer to Figure 5-Figure 12 The adjusting component 23 includes a base 3 231, the bottom of the base 3 231 is fixedly connected to the sliding U-shaped plate 201, the top of the base 3 231 is fixedly connected to a forward and backward moving device 232, the inner wall of the forward and backward moving device 232 is movably connected to a switching component 24, and the side of the forward and backward moving device 232 close to the pressing component 21 is fixedly connected to a track 1 233, the inner wall of the track 1 233 is provided with a slide groove 234, and the inner wall of the slide groove 234 is fixedly connected to a sliding column 1 235, the outer wall of the sliding column 235 is movably connected with a slider 236, the outer wall of the sliding column 235 is sleeved with a spring 237, the top of the spring 237 is fixedly connected to the slider 236, the bottom of the spring 237 is fixedly connected to the slide groove 234, the outer wall of the slider 236 is fixedly connected with a T-plate 238, both ends of the T-plate 238 are fixedly connected with a hollow plate 239, the inner wall of the track 233 is movably connected with the hollow plate 239, the base 233 is fixedly connected with the hollow plate 239, and the base 234 is fixedly connected with the T-plate 238. A force plate 2310 is provided on the side close to the movable assembly 22. The upper and lower ends of the force plate 2310 close to the base 1 are fixedly connected to sliding columns 2311. The outer wall of the sliding column 2311 is movably connected to the base 3 231. The ends of the two sliding columns 2311 away from the force plate 2310 are fixedly connected to circular plates 2312. The sides of the two circular plates 2312 away from the sliding columns 2311 are fixedly connected to springs 3 2313. One end of spring three 2313 away from circular plate two 2312 is fixedly connected to base three 231, one side of upper circular plate two 2312 away from sliding column two 2311 is fixedly connected with connecting column 2314, one end of connecting column 2314 away from circular plate two 2312 is fixedly connected with connecting plate two 2315, one end of connecting plate two 2315 away from connecting column 2314 is fixedly connected with locking column 2316, and the outer wall of locking column 2316 is movably connected to hollow plate 239.

[0027] The switching assembly 24 includes a base four 241, a slider two 242 is fixedly connected to the bottom of the base four 241, the outer wall of the slider two 242 is movably connected to the front-rear moving device 232, the left and right ends of the base four 241 close to the movable assembly 22 are fixedly connected to the track two 243, the inner walls of the two tracks two 243 are movably connected to the sliding seat two 244, and the two sliding seats two 244 are provided with positioning holes 245 on the side away from the track two 243, the inner wall of the right sliding seat two 244 is fixedly connected to the motor 246, the output end of the motor 246 is fixedly connected to the drill bit 247, the inner wall of the left sliding seat two 244 is fixedly connected to the sleeve 248, the inner wall of the sleeve 248 is movably connected to the sliding column three 249, the bottom of the sliding column three 249 is fixedly connected to the drill bit 247, the bottom of the sliding column three 249 is fixedly connected to the spring four 2411, and the bottom of the spring four 2411 is fixedly connected to the sleeve 248.

[0028] The working principle of this embodiment is as follows: before the plate needs to be processed, first start the front-rear moving device 232 to move the corresponding processing structure to the top of the track 1 233. At this time, the corresponding track 243 coincides with the track 1 233. Then start the movable component 22 to allow the positioning column 225 to be embedded in the positioning hole 245 on the sliding seat 244. Then the pressure column 223 will apply an external force to the force-bearing plate 2310 to move the force-bearing plate 2310 backward. At this time, the force-bearing plate 2310 will drive the connecting column 2314 and the connecting plate 2315 to move backward through the sliding column 2311 and the circular plate 2312. As the connecting plate 2315 moves, the locking column 2316 is pulled out of the hollow plate 239, and the restriction on the T-plate 238 is released, so that the processing structure can move up and down normally. Finally, start the pressing component 21 to drive the processing component to move up and down.

[0029] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0030] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A CNC hydraulic flat plate high-speed punching and drilling compound machine, comprising a base (1), a workbench (101) being fixedly connected to the top of the base (1), and a horizontal moving device (102) being fixedly connected to the outer wall of the base (1), characterized in that: Also includes: A composite mechanism (2), wherein the composite mechanism (2) comprises a plate sliding U-shaped plate (201), wherein the inner wall of the sliding U-shaped plate (201) is movably connected to a horizontal moving device (102), a pressing component (21) is fixedly connected to the left side of the top of the sliding U-shaped plate (201), and an adjusting component (23) is fixedly connected to the right side of the top of the sliding U-shaped plate (201).

2. The CNC hydraulic flat plate high-speed punching and drilling compound machine according to claim 1, characterized in that: The pressing component (21) comprises a second base (211), the bottom of which is fixedly connected to the sliding U-shaped plate (201), the top of which is fixedly connected to a vertical moving device (212), the side of which close to the adjusting component (23) is movably connected to a second horizontal moving device (213), the bottom of which is movably connected to the movable component (22), and the end of which away from the vertical moving device (212) is fixedly connected to a push rod (214).

3. The CNC hydraulic flat plate high-speed punching and drilling compound machine according to claim 2, characterized in that: The movable component (22) comprises a sliding seat (221), the outer wall of which is movably connected to a horizontal moving device (213), the bottom of the sliding seat (221) is fixedly connected to a connecting plate (222), the bottom of the connecting plate (222) is fixedly connected to a pressure column (223) on one side close to the adjusting component (23), the connecting plate (222) is fixedly connected to a support plate (224) on one side away from the pressure column (223), and the top of the support plate (224) is fixedly connected to the sliding seat (221).

4. The CNC hydraulic flat plate high-speed punching and drilling compound machine according to claim 3, characterized in that: The inner wall of the connecting plate 1 (222) is movably connected with a positioning column (225), and one end of the positioning column (225) away from the pressure column (223) is fixedly connected with a circular plate 1 (226). The outer wall of the positioning column (225) is sleeved with a spring 1 (227), one end of the spring 1 (227) is fixedly connected to the circular plate 1 (226), and the end of the spring 1 (227) away from the circular plate 1 (226) is fixedly connected to the connecting plate 1 (222).

5. The CNC hydraulic flat plate high-speed punching and drilling compound machine according to claim 4, characterized in that: The adjustment component (23) comprises a base three (231), the bottom of the base three (231) is fixedly connected to the sliding U-shaped plate (201), the top of the base three (231) is fixedly connected to a forward and backward moving device (232), the inner wall of the forward and backward moving device (232) is movably connected to a switching component (24), the side of the forward and backward moving device (232) close to the pressing component (21) is fixedly connected to a track one (233), the inner wall of the track one (233) is provided with a sliding groove (234), and the inner wall of the sliding groove (234) is fixedly connected to a sliding column one (235).

6. The CNC hydraulic flat plate high-speed punching and drilling compound machine according to claim 5, characterized in that: The outer wall of the sliding column 1 (235) is movably connected to a sliding block 1 (236); the outer wall of the sliding column 1 (235) is sleeved with a spring 2 (237); the top of the spring 2 (237) is fixedly connected to the sliding block 1 (236); the bottom of the spring 2 (237) is fixedly connected to the sliding groove (234); the outer wall of the sliding block 1 (236) is fixedly connected to a T-plate (238); both ends of the T-plate (238) are fixedly connected to a hollow plate (239); and the inner wall of the track 1 (233) is movably connected to the hollow plate (239).

7. The CNC hydraulic flat plate high-speed punching and drilling compound machine according to claim 6, characterized in that: A force-bearing plate (2310) is provided on one side of the base three (231) close to the movable component (22); the force-bearing plate (2310) is fixedly connected to a sliding column two (2311) at both upper and lower ends of the side close to the base one (1); the outer wall of the sliding column two (2311) is movably connected to the base three (231); the ends of the two sliding columns two (2311) away from the force-bearing plate (2310) are fixedly connected to a circular plate two (2312); the sides of the two circular plates two (2312) away from the sliding column two (2311) are fixedly connected to a spring three (2313); The ends of the two springs three (2313) away from the circular plate two (2312) are fixedly connected to the base three (231); the side of the upper circular plate two (2312) away from the sliding column two (2311) is fixedly connected to a connecting column (2314); the end of the connecting column (2314) away from the circular plate two (2312) is fixedly connected to the connecting plate two (2315); the end of the connecting plate two (2315) away from the connecting column (2314) is fixedly connected to the locking column (2316); the outer wall of the locking column (2316) is movably connected to the hollow plate (239).

8. The CNC hydraulic flat plate high-speed punching and drilling compound machine according to claim 7, characterized in that: The switching component (24) comprises a base four (241), the bottom of the base four (241) is fixedly connected to a slider two (242), the outer wall of the slider two (242) is movably connected to the front-rear moving device (232), the left and right ends of the base four (241) close to the movable component (22) are fixedly connected to the track two (243), the inner walls of the two tracks two (243) are movably connected to the sliding seat two (244), and the two sliding seats two (244) are provided with positioning holes (245) on the side away from the track two (243), which are located on the right side. The inner wall of the sliding seat 2 (244) is fixedly connected to a motor (246), the output end of the motor (246) is fixedly connected to a drill bit (247), the inner wall of the sliding seat 2 (244) on the left side is fixedly connected to a sleeve (248), the inner wall of the sleeve (248) is movably connected to a sliding column 3 (249), the bottom of the sliding column 3 (249) is fixedly connected to a punching drill bit (247), the bottom of the sliding column 3 (249) is fixedly connected to a spring 4 (2411), and the bottom of the spring 4 (2411) is fixedly connected to the sleeve (248).

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