An assembly apparatus for a vacuum cleaner hose

Abstract

The application relates to an assembling device for a dust collector pipe, which comprises a locking screw structure, the locking screw structure comprising a feeding assembly for carrying the pipe, a locking screw assembly arranged above the feeding assembly and used for locking the screw of the pipe, and a transfer assembly arranged on one side of the locking screw assembly; a screwing structure used for transferring the screw to the locking screw assembly; a detection structure comprising a carrying assembly used for carrying the pipe after screw locking, a bending assembly arranged on one side of the carrying assembly and used for driving the pipe to rotate, and a detection assembly used for detecting the air tightness of the pipe. The assembling device for the dust collector pipe sends the screw to the locking screw structure through the screwing structure, screws the screw into the two sides of the pipe through the locking screw structure, drives the pipe to rotate and detects the air tightness through the detection structure, ensures that the angle of the pipe bending each time is consistent, and improves the production quality and efficiency of the dust collector pipe.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of pipeline assembly, and particularly relates to an assembly device for a pipeline of a dust collector. BACKGROUND

[0002] The existing dust collector generally comprises a main machine and a dust collector head connected through a pipeline, the main machine is internally provided with a motor and a dust collecting cylinder, and is externally provided with a handle. When working, the user holds the handle and starts the switch, the motor rotates at high speed to generate negative pressure in the sealed shell, so that dust is sucked into the dust collecting cylinder through the pipeline to complete cleaning.

[0003] On the assembly production line of the dust collector, the assembly and detection of the pipeline are key links. At present, the process mainly relies on manual operation: first, the operator needs to hold a screwdriver to assemble the pipeline by locking the screw; then, in the air tightness detection link, the pipeline still needs to be manually bent and placed into the detection equipment.

[0004] However, this mainly manual operation mode has obvious disadvantages: first, manual locking of the screw is low in efficiency and high in labor intensity, and is difficult to adapt to the modern large-scale production rhythm; second, the angle, force and speed of manual bending of the pipeline cannot be accurately controlled, resulting in random differences in the bending shape each time, and such inconsistency directly interferes with the accuracy and reliability of the air tightness detection result, may cause misjudgment or missed detection, and affects the quality of the products leaving the factory. SUMMARY

[0005] The present application overcomes the double defects of low assembly efficiency of the pipeline of the dust collector and influence of the result accuracy due to inconsistent bending angle in the subsequent air tightness detection caused by the existing technology relying on manual operation on the assembly production line of the dust collector, thereby providing an assembly device for the pipeline of the dust collector to realize the integration of high-precision assembly and reliable detection of the pipeline.

[0006] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows: an assembly device for a pipeline of a dust collector, comprising:

[0007] A screw locking structure, the screw locking structure comprises a feeding assembly for bearing the pipeline, a screw locking assembly arranged above the feeding assembly and used for locking the screws on both sides of the pipeline, and a transfer assembly arranged on one side of the screw locking assembly and used for transferring the pipeline after the screw locking;

[0008] A screw feeding structure, the screw feeding structure is used for transferring the screw to the screw locking assembly;

[0009] The detection structure comprises a bearing assembly for bearing the screwed pipe, a bending assembly arranged on one side of the bearing assembly and driving the pipe to rotate between 0° and 90°, and a detection assembly for detecting the air tightness of the pipe at the two extreme positions of 0° and 90°.

[0010] Optimally, the feeding assembly comprises a frame, a carrier movably arranged on the top of the frame along the Y axis, and a clamping unit rotatably mounted on the top of the carrier, the clamping unit being used for clamping the pipe and driving it to rotate in the forward and reverse directions, and the screw locking assembly being used for locking the two side walls of the pipe.

[0011] Optimally, the screw locking assembly comprises a gantry arranged above the frame, a moving frame movably arranged on one side of the gantry along the X axis, a lifting plate liftably mounted on one side of the moving frame, a screwdriver set fixed on the bottom of the lifting plate, and an electric driver head adjustably arranged on one side of the lifting plate and matched with the screwdriver set.

[0012] Optimally, the transferring assembly comprises a transferring plate movably arranged on one side of the gantry along the Y axis, a mounting frame liftably arranged on one side of the transferring plate, and a clamping unit adjustably mounted on both sides of the mounting frame, the clamping unit being used for clamping the screwed pipe.

[0013] Optimally, the screw feeding structure comprises a feeding frame for feeding the screw, a bearing frame fixed on the outlet side of the feeding frame, a receiving block slidingly mounted in the bearing frame, an air pipe mounted on the bottom of the bearing frame, and a receiving mechanism arranged in the receiving block, the receiving mechanism alternately receiving the screw on the outlet side of the feeding frame and transferring it into the air pipe, and the air pipe being connected with the screwdriver set.

[0014] Optimally, the receiving mechanism comprises a first avoiding groove opened on the side of the receiving block close to the feeding frame, a dropping groove penetrating the receiving block in the vertical direction and communicating with the first avoiding groove and the air pipe, a through groove penetrating the receiving block and communicating with the first avoiding groove, a receiving plate slidingly inserted into the through groove, and a second avoiding groove opened on the side of the receiving plate close to the feeding frame.

[0015] When the receiving plate is in the receiving position, the receiving plate is extended to receive the screw on the feeding frame.

[0016] When the receiving plate is in the dropping position, the receiving plate is retracted to release the support of the screw.

[0017] Optimally, the material taking mechanism further comprises a top plate fixed on the side of the bearing frame away from the feeding frame, a front top part arranged inside the top plate, rear retracted parts arranged on both sides of the front top part, a connecting part connecting the front top part and the rear retracted parts and arranged obliquely, a driving block integrally connected on one side of the receiving plate and elastically connected with the receiving block, and a resisting wheel rotatably mounted in the driving block.

[0018] When the receiving plate is in the receiving position, the resisting wheel is in contact with the front top part to push the receiving plate out;

[0019] When the receiving plate is in the receiving position, the resisting wheel is in contact with the front top part to push the receiving plate out;

[0020] Optimally, the bearing assembly comprises a detection table, clamping plates fixed on the top of the detection table and arranged at intervals, clamping grooves opened on the top of the clamping plates, and pressing blocks pressed on the pipes.

[0021] Optimally, the bending assembly comprises a rotating plate rotatably mounted on the top of the detection table, two connecting plates integrally connected on one side of the rotating plate, contact wheels mounted on the side of the connecting plates away from the rotating plate, accommodating grooves opened on the outside of the contact wheels, a limiting frame fixed on the top of the detection table, clamping plates fixed on one side of the limiting frame and arranged at intervals, and clamping grooves formed between the clamping plates, when the pipe is bent to 90°, the pipe is inserted into the clamping groove.

[0022] Optimally, the detection assembly comprises pipes and a first sensor movably arranged on the top of the detection table and located on both sides of the pipe, and a second sensor liftably arranged above the limiting frame, the pipe is inserted into one end of the pipe;

[0023] When the pipe is in a horizontal state, the first sensor is inserted into the other end of the pipe;

[0024] When the pipe is bent to 90°, the second sensor is inserted into the other end of the pipe.

[0025] Thanks to the use of the above technical solutions, the present application has the following advantages compared with the prior art:

[0026] The application is used for assembling equipment of dust collector pipe, which sends screw into locking screw structure by screw feeding structure, rotates screw into two sides of pipe by locking screw structure, finally rotates pipe between 0° and 90° two limit positions by detection structure, and carries out air tightness detection at 0° and 90° two limit positions, which can ensure that the angle of pipe bending each time is consistent, eliminates human intervention in detection process, improves pipe assembling efficiency and subsequent detection efficiency, saves cost, and improves production quality and efficiency of dust collector pipe. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a structure schematic view of dust collector pipe;

[0028] Figure 2 It is a structure schematic view of another angle of dust collector pipe;

[0029] Figure 3 It is a structure schematic view of locking screw structure of the application;

[0030] Figure 4 It is a structure schematic view of feeding assembly in locking screw structure of the application;

[0031] Figure 5 It is a partial structure schematic view of the application; Figure 4

[0032] Figure 6 It is a structure schematic view of locking screw assembly in locking screw structure of the application;

[0033] Figure 7 It is a front view of the application; Figure 6

[0034] Figure 8 It is a structure schematic view of transfer assembly in locking screw structure of the application;

[0035] Figure 9 It is a partial structure schematic view of the application; Figure 8

[0036] Figure 10 It is a structure schematic view of screw feeding structure of the application;

[0037] Figure 11 It is a structure schematic view of another angle of screw feeding structure of the application;

[0038] Figure 12 It is a structure schematic view of another angle of screw feeding structure of the application;

[0039] Figure 13 It is a partial top view of screw feeding structure of the application;

[0040] Figure 14 ​​​Partial structure diagram of the screw structure of the present application;

[0041] Figure 15 Partial structure diagram of the screw structure of the present application;

[0042] Figure 16 Structure diagram of the detection structure of the present application;

[0043] Figure 17 Partial structure diagram of the detection structure of the present application;

[0044] Figure 18 Partial structure diagram of the detection structure of the present application;

[0045] Figure 19 Partial structure diagram of the detection structure of the present application;

[0046] BRIEF DESCRIPTION OF THE DRAWINGS

[0047] 100, frame; 101, workbench; 102, sliding plate; 103, mounting plate; 104, side plate; 105, servo motor; 106, turnover plate; 107, turnover groove; 108, turnover plate; 109, first pressing cylinder; 110, main carrier plate; 111, main carrier groove; 112, auxiliary carrier plate; 113, auxiliary carrier groove; 114, main reinforcing plate; 115, auxiliary reinforcing plate; 116, reinforcing groove; 117, gantry frame; 118, moving frame; 119, lifting plate; 120, sliding rail; 121, sliding block; 122, bit mounting plate; 123, electric bit; 124, first cylinder mounting plate; 125, connecting plate; 126, pushing cylinder; 127, abutting piece; 128, connecting rod; 129, anti-dropping block; 130, through hole; 131, first spring; 132, bit set fixing plate; 133, screw bit set; 134, Y-axis linear module; 135, transfer plate; 136, Z-axis linear module; 137, mounting frame; 138, adjusting groove; 139, finger cylinder; 140, clamping plate; 141, clamping groove;

[0048] 200, feeding frame; 201, feeding groove; 202, angle plate; 203, first side plate; 204, bottom plate; 205, second side plate; 206, second cylinder mounting plate; 207, pushing cylinder; 208, mounting groove; 209, top plate; 210, front top part; 211, rear shrink part; 212, connecting part; 213, material receiving block; 214, limiting plate; 215, through groove; 216, material receiving plate; 217, driving block; 218, spring groove; 219, second spring; 220, abutting wheel; 221, first avoiding groove; 222, material falling groove; 223, air pipe; 224, second avoiding groove; 225, first guiding part;

[0049] 300. Testing table; 301. Support plate; 302. Clamping plate; 303. Clamping groove; 304. First slide cylinder; 305. First slide plate; 306. Fixing plate; 307. Insertion tube; 308. Second slide cylinder; 309. Second slide plate; 310. First sensor; 311. Second pressing cylinder; 312. Third cylinder mounting plate; 313. Third pressing cylinder; 314. Pressing block; 315. Rotary cylinder; 31 6. Rotating plate; 317. Extension plate; 318. Fixing rod; 319. Contact wheel; 320. Receiving groove; 321. Limiting nut; 322. Limiting frame; 323. Clamping plate; 324. Clamping groove; 325. Second guide part; 326. Arc-shaped part; 327. Support frame; 328. Vertical plate; 329. Third linear slide; 330. Third sliding plate; 331. Second sensor; 332. Clearance hole; 333. Contact head. Detailed Implementation

[0050] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0051] The present invention relates to an assembly device for vacuum cleaner tubing, comprising a screw-locking structure, a screw-on structure, and a detection structure. The screw-locking structure is used for... Figure 1 , Figure 2 The pipe shown has screws on both sides. The screw-on structure is used to deliver the screws to the screw-on structure. The detection structure is used to bend the pipe and test its airtightness after the screws are tightened.

[0052] like Figure 3 The diagram shows a screw-locking structure, which includes a feeding assembly, a screw-locking assembly, and a transfer assembly. The operator places the pipe on the feeding assembly, and the screw-locking assembly screws onto both sides of the pipe. Then, the transfer assembly transfers the screw-locked pipe to the conveyor belt below, transporting the pipe to the next work station.

[0053] like Figure 4 , 5As shown, the feeding assembly includes a rack 100, a workbench 101, a sliding plate 102, a mounting plate 103, a side plate 104, a servo motor 105, a turnover plate 106, a turnover groove 107, a turnover plate 108, a first pressing cylinder 109, a main carrier plate 110, a main carrier groove 111, a vice carrier plate 112, a vice carrier groove 113, a main reinforcing plate 114, a vice reinforcing plate 115, and a reinforcing groove 116. The rack 100 is welded by aluminum profiles, and a foot pad is installed at the bottom of the rack 100 to support the aluminum profile rack away from the ground, avoiding the corrosion of the rack 100 caused by ground water (the rack 100 is arranged on a conveying belt, i.e., the conveying belt for conveying the pipeline is located at the bottom of the rack 100 and avoids the vertical profile of the rack 100, the conveying direction of the conveying belt is the same as the conveying direction of the sliding plate 102, and the operator is located on one side of the conveying belt to place the pipeline on the conveying belt on the feeding assembly, the conveying belt is not shown in the figure, and the conveying belt is a conventional conveying structure in the prior art).

[0054] The workbench 101 is fixed on the top of the rack 100 by screw fastening, and two groups of linear modules are fixedly installed on the top of the workbench 101. The sliding plate 102 is fixed on the sliding block of the linear module by screw fastening, and the sliding plate 102 is driven to move back and forth by the linear module (the linear module is a conventional driving member in the prior art, and in this embodiment, a cylinder, a ball screw, or other driving members can be used to replace the linear module; for example, Figure 3 As shown, the moving direction of the sliding plate 102 is the Y direction, and the conveying direction of the conveying belt located at the bottom of the inner side of the rack 100 is the same as the moving direction of the sliding plate 102, which is the Y direction conveying).

[0055] As shown in Figure 4 , 5 The mounting plate 103 is fixed on the top of the sliding plate 102 by screw fastening, and when the sliding plate 102 is moved by the linear module on the workbench 101, the mounting plate 103 above the sliding plate 102 is moved synchronously. The side plate 104 has two plates, which are vertically fixed on the top of the mounting plate 103 by welding and located at the two short sides of the mounting plate 103.

[0056] The main reinforcing plate 114 is fixed at one long side of the mounting plate 103 by welding, and the auxiliary reinforcing plate 115 has two plates integrally connected on both sides of the main reinforcing plate 114. The main reinforcing plate 114 and the auxiliary reinforcing plate 115 are provided with reinforcing grooves 116 on the side close to the side plate 104, and the reinforcing grooves 116 are in the shape of "U" to match the side plate 104 and the mounting plate 103. In actual installation, the reinforcing grooves 116 on the inner side of the main reinforcing plate 114 and the auxiliary reinforcing plate 115 are inserted on the side plate 104, and then the main reinforcing plate 114 and the auxiliary reinforcing plate 115 are fixed on one side of the mounting plate 103 by welding. By arranging the main reinforcing plate 114 and the auxiliary reinforcing plate 115, the structural strength of the two groups of side plates 104 is improved, and the deformation of the side plates 104 on both sides during rotation is avoided to affect the locking effect of the screws; by arranging the reinforcing grooves 116, the main reinforcing plate 114 and the auxiliary reinforcing plate 115 inserted are positioned.

[0057] The turnover plate 106 has two plates and is rotatably installed on the inner side of the two side plates 104. Specifically, the side plate 104 is provided with a through hole penetrating in the horizontal direction, a bearing is installed in the through hole of the side plate 104, and the turnover plate 106 is fixed with a rotating shaft penetrating through the bearing on the back side. The servo motor 105 is fixed on the outer side of the side plate 104 by screw fastening and is connected with one of the rotating shafts, and the turnover plate 106 is driven to rotate by the servo motor 105.

[0058] As shown in Figure 4 , the turnover plate 106 is in the shape of "L", the inner side of the turnover plate 106 is provided with a turnover groove 107, the turnover plate 108 is abutted in the turnover groove 107 of the two turnover plates 106, and then the turnover plate 108 is fixed on the inner side of the turnover plate 106 by screw fastening. When the servo motor 105 drives the turnover plate 106 to rotate, the turnover plate 108 is synchronously rotated. By arranging the turnover groove 107 on the inner side of the turnover plate 106, the turnover plate 108 is supported to improve the structural strength after being fixed and installed.

[0059] The main carrier plate 110 is fixed on the top of the turnover plate 108 by screw fastening, the main carrier groove 111 is arranged on the top of the main carrier plate 110, and the main carrier groove 111 matches the structure of the connection of the pipeline to carry the pipeline to be locked by the screw. The auxiliary carrier plate 112 is fixed on the top of the turnover plate 108 by screw fastening, and the auxiliary carrier groove 113 is arranged on the top of the auxiliary carrier plate 112. Since the pipeline is long, the main structure of the pipeline is placed in the main carrier groove 111, and the remaining part of the pipeline is placed in the auxiliary carrier groove 113.

[0060] The first pressing cylinder 109 is fixed on the top of the turning plate 108 and is pressed on the pipeline. When the turning plate 108 rotates to drive the pipeline to rotate, under the pressing action of the first pressing cylinder 109, the pipeline is prevented from falling or deviating, thereby affecting the accuracy of the screw locking position (the first pressing cylinder 109 can be selected from the ACK series of commercially available corner cylinders).

[0061] When the pipeline shown in Figure 1 、 2 is screwed, the turning plate 108 is rotated clockwise by 90° by the servo motor 105, the side of the pipeline is arranged upward, and then the screw locking assembly above is used to complete the screw locking of one side of the pipeline. Then the turning plate 108 is rotated counterclockwise by 180° by the servo motor 105, the other side of the pipeline is arranged upward, and then the screw locking assembly above is used to complete the screw locking of the other side of the pipeline.

[0062] As shown in Figure 6 、 7 , it is a schematic view of the screw locking assembly. The screw locking assembly is used to lock the screws on both sides of the pipeline. The screw locking assembly includes a gantry 117, a moving frame 118, a lifting plate 119, a sliding rail 120, a sliding block 121, a bit mounting plate 122, an electric bit 123, a first cylinder mounting plate 124, a connecting plate 125, a pushing cylinder 126, a resisting piece 127, a connecting rod 128, an anti-dropping block 129, a through hole 130, a first spring 131, a bit sleeve fixing plate 132, and a screw bit sleeve 133. The gantry 117 is fixed on the top of the rack 100 by screw fastening and is arranged above the workbench 101. The moving frame 118 is slidingly installed on one side of the gantry 117 along the X-axis direction (specifically, a linear module is fixed on one side of the top of the gantry 117 along the X-axis direction, and the moving frame 118 is fixed on the sliding block of the linear module by screw fastening. The moving frame 118 is driven to move along the X-axis by the linear module, and the electric bit 123 below is driven to move along the X-axis, thereby locking the screws on both sides of the pipeline).

[0063] The lifting plate 119 is arranged on the side of the moving frame 118 away from the gantry 117 (specifically, a vertical linear module is fixed on the side of the moving frame 118 away from the gantry 117 by screw fastening, and the lifting plate 119 is fixed on the sliding block of the linear module by screw fastening). By arranging the linear modules along the X-axis and the Z-axis on one side of the gantry 117, the lifting plate 119 is driven to approach the screw hole of the pipeline, thereby facilitating the subsequent screw locking.

[0064] The slide rail 120 is fixed vertically on one side of the lifting plate 119 by screw fastening, the sliding block 121 is slidingly installed on the slide rail 120, the bit mounting plate 122 is fixed on the side of the sliding block 121 away from the slide rail 120 by screw fastening, and the electric bit 123 is fixed on the bit mounting plate 122 (the electric bit 123 is a conventional structure in the prior art, which comprises a screwdriver and a motor connected with the screwdriver and used for driving the screwdriver to rotate; specifically, the motor of the electric bit 123 is fixed on the bit mounting plate 122, and the screwdriver of the electric bit 123 penetrates through the bit mounting plate 122).

[0065] The screw bit set fixing plate 132 is fixed on one side of the bottom of the lifting plate 119 by screw fastening, and the screw bit set 133 is fixed on the screw bit set fixing plate 132. The screw bit set 133 is a conventional structure in the prior art, which has two connected entrances, one of which is used for the screwdriver of the electric bit 123 to penetrate, and the other is used for the screw to enter (in actual use, the air pipe 223 of the upper screw structure is connected with the screw entrance of the screw bit set 133, and the screw is blown into the screw bit set 133, and the electric bit 123 is lowered to screw the screw on the two sides of the pipe by the screwdriver).

[0066] The first cylinder mounting plate 124 is fixed on one side of the lifting plate 119 by screw fastening, the cylinder body of the push cylinder 126 is fixed on the first cylinder mounting plate 124, and the piston rod of the push cylinder 126 is welded with the abutting plate 127 by penetrating through the first cylinder mounting plate 124. The connecting rod 128 is fixed on the bottom of the abutting plate 127, that is, the side of the abutting plate 127 away from the push cylinder 126 by welding.

[0067] The connecting plate 125 is fixed on one side of the bit mounting plate 122, and the connecting plate 125 is provided with a through hole 130 for the connecting rod 128 to penetrate. The anti-falling block 129 is fixed on the bottom of the connecting rod 128 and abuts against the bottom of the connecting plate 125. The diameter of the anti-falling block 129 is greater than that of the through hole 130 of the connecting plate 125. Under the bearing action of the anti-falling block 129, the bit mounting plate 122 and the electric bit 123 are prevented from sliding downward under the action of gravity. The first spring 131 is sleeved on the connecting rod 128, and the two ends of the first spring 131 are respectively located between the abutting plate 127 and the connecting plate 125.

[0068] The locking screw mechanism has the following locking screw working principle:

[0069] The upper loading assembly carrying the pipeline moves to the lower side of the screw locking mechanism. After the lifting plate 119 moves to the hole position of the pipeline screw hole, the screw blowing structure blows the screw into the screw driver sleeve 133. The push cylinder 126 drives the abutting piece 127, the connecting rod 128 and the anti-dropping block 129 to descend synchronously. At this time, the connecting plate 125, the driver mounting plate 122 and the electric driver 123 move downward under the action of their own gravity to insert the screw driver into the screw driver sleeve 133. The push cylinder 126 continues to descend, the first spring 131 is compressed, and the connecting plate 125 is subjected to downward pressure under the reverse action of the first spring 131, driving the driver mounting plate 122 and the electric driver 123 to continue to descend and tightly abut the screw. The electric driver 123 screws the screw downward into the screw hole on both sides of the pipeline. When the push cylinder 126 resets, the anti-dropping block 129 pulls up the connecting plate 125 together with the driver mounting plate 122.

[0070] By setting the first spring 131, the electric driver 123 is subjected to downward pressure under the reverse action of the first spring 131 compressed and deformed, so that the electric driver 123 rotates and descends while screwing the screw into the screw hole of the pipeline. The setting of the first spring 131 can play a role in shock absorption, prolonging the service life of the equipment. At the same time, the first spring 131 provides continuous radial pressure through elastic deformation, ensuring that the electric driver 123 closely abuts the screw and preventing slipping or sliding of the screw.

[0071] As shown in Figure 8 , 9 , it is a structural schematic diagram of the transfer assembly. The transfer assembly is used to clamp the pipeline after the screw is locked and transfer the pipeline to the conveyor belt below the rack 100. The transfer assembly includes a Y-axis linear module 134, a transfer plate 135, a Z-axis linear module 136, a mounting frame 137, an adjusting groove 138, a finger cylinder 139, a clamping plate 140 and a clamping groove 141. The Y-axis linear module 134 is fixed on the other side of the top of the gantry 117 along the Y direction. The transfer plate 135 is fixed on the sliding block of the Y-axis linear module 134 by screw fastening. The Y-axis linear module 134 drives the transfer plate 135 to move along the Y-axis, thereby transferring the pipeline.

[0072] The Z-axis linear module 136 is fixed on one side of the transfer plate 135 and arranged along the Z-axis direction. The mounting frame 137 is connected with the Z-axis linear module 136. The Z-axis linear module 136 drives the mounting frame 137 to descend to clamp the pipeline after the screw is locked on the upper loading assembly.

[0073] As shown in Figure 9As shown, adjustment grooves 138 are provided on both sides of mounting bracket 137, and adjustment grooves 138 are waist-shaped grooves. Finger cylinders 139 are fixed to both sides of mounting bracket 137 by bolt fastening (specifically, the fastening bolts are passed through adjustment grooves 138 and fixed in the threaded holes on the side of finger cylinders 139 to complete the installation of finger cylinders 139. By setting adjustment grooves 138, the positions of two sets of finger cylinders 139 can be adjusted, thereby adjusting the position of pipe clamping).

[0074] The clamping plate 140 is fixed to the gripper of the finger cylinder 139 by screws. The finger cylinder 139 drives the two sets of clamping plates 140 inside to move inward synchronously, thereby completing the clamping of the pipe. The clamping groove 141 is formed on the inner side of the clamping plate 140. The clamping groove 141 is "V" shaped. When clamping the pipe, the side wall of the pipe is tangent to the "V" shaped clamping groove 303, which improves the stability of the clamping and prevents the pipe from falling when transferring the pipe.

[0075] like Figures 10-13 The diagram shows the structure of the screw-on mechanism, which is located on one side of the frame 100 and is used to blow screws into the screwdriver sleeve 133. The feeding rack 200 is connected to the vibratory feeder, and a vertical vibrator is installed at the bottom of the feeding rack 200. The vibratory feeder feeds the screws into the feeding trough 201 of the feeding rack 200 (e.g., ...). Figure 10 As shown, the feeding trough 201 is located on the top of the feeding rack 200, and the screws are arranged in the feeding trough 201 of the feeding rack 200. Each screw consists of a nut and a screw rod, with the nut resting against the top of the feeding trough 201 and the screw rod located inside the feeding trough 201.

[0076] Angle plate 202 is L-shaped and is fixed to both sides of the end of the conveying direction of the feeding rack 200 by screws. First side plate 203 is fixed to one side of angle plate 202 by screws. Base plate 204 is fixed to the side of first side plate 203 away from angle plate 202 by screws. Second side plate 205 is fixed to the side of base plate 204 away from first side plate 203 by screws. Second cylinder mounting plate 206 is fixed to one side of second side plate 205 by screws. Push cylinder 207 is fixed to the outside of second cylinder mounting plate 206 by screws and is connected to receiving block 213. Push cylinder 207 drives receiving block 213 to move back and forth, thereby picking up screws in feeding groove 201 and transferring them into air pipe 223.

[0077] like Figure 12As shown, the receiving block 213 is matched with the first side plate 203 and the bottom plate 204 through the clamping groove structure, improving the stability of the reciprocating movement of the receiving block 213. The limiting plate 214 is fixed on the top of the first side plate 203 by screw fastening and abuts against the upper surface of the receiving block 213. Under the action of the limiting plate 214, the stability of the movement of the receiving block 213 is ensured.

[0078] As shown in the drawings, Figure 13 The mounting groove 208 is opened on the top of the second side plate 205, and the top plate 209 is fixed on the top of the second side plate 205 by screw fastening and located in the mounting groove 208. The side of the top plate 209 close to the receiving block 213 is provided with a front top portion 210, a rear shrink portion 211 and a connecting portion 212 which are connected together. Figure 13 As a top view, the front top portion 210 is located at the middle position of the top plate 209 and corresponds to the feeding groove 201 of the feeding frame 200, the rear shrink portion 211 is arranged on both sides of the front top portion 210, the connecting portion 212 is used to connect the front top portion 210 and the rear shrink portion 211, and the connecting portion 212 is arranged obliquely. In order to facilitate the rolling of the abutting wheel 220, the connecting portion 212 and the front top portion 210 and the connecting portion 212 and the rear shrink portion 211 are connected in arc transition.

[0079] As shown in the drawings, Figure 13 The distance between the front top portion 210 and the receiving block 213 is less than the distance between the rear shrink portion 211 and the receiving block 213. When the receiving block 213 moves, the contact position of the abutting wheel 220 and the top plate 209 is changed, and then the receiving plate 216 is pushed out to receive material or withdrawn to release material.

[0080] As shown in the drawings, Figure 14 As a partial structure diagram of the side of the receiving block 213 close to the top plate 209, the through groove 215 has two groups and penetrates through the receiving block 213. The opening direction of the through groove 215 is perpendicular to the moving direction of the receiving block 213, and the receiving plate 216 is inserted into the through groove 215 of the receiving block 213 in cooperation. The side of the receiving plate 216 close to the top plate 209 is integrally connected with the driving block 217, and the side of the driving block 217 close to the top plate 209 is rotatably installed with the abutting wheel 220 through the rotating shaft, as shown in the drawings, Figure 13 The abutting wheel 220 abuts against the inner side of the top plate 209. The spring groove 218 is opened on the opposite sides of the receiving block 213 and the driving block 217, and the second spring 219 is arranged in the spring groove 218. By arranging the second spring 219, the receiving plate 216 is assisted to retreat, thereby completing the releasing of material.

[0081] As shown in the drawings, Figure 13As shown, since the front top 210 is closer to the receiving block 213 than the rear retracted portion 211, when the abutment wheel 220 rolls to contact the front top 210, it will push the drive block 217 together with the receiving plate 216 toward the side closer to the feeder 200. At this time, the second spring 219 is compressed. When the abutment wheel 220 rolls along the connecting portion 212 to contact the rear retracted portion 211, since the rear retracted portion 211 is away from the receiving block 213, under the action of the second spring 219 resetting, it will push the receiving plate 216 and the drive block 217 toward the side away from the feeder 200, thereby driving the receiving plate 216 to retract and thus completing the feeding.

[0082] like Figure 15 The diagram shows the structure of the receiving block 213 near the feeding rack 200. Two sets of first clearance grooves 221 are spaced apart on the receiving block 213 near the feeding rack 200. The first clearance grooves 221 are arc-shaped to avoid screws on the feeding rack 200. A discharge groove 222 is located at the bottom of the first clearance groove 221 and passes through the receiving block 213. Two sets of transition grooves are vertically formed on the base plate 204, located on both sides of the feeding rack 200. An air pipe 223 is installed at the bottom of the base plate 204 and connected to the transition grooves. The first clearance groove 221 and the dropping groove 222 on the receiving block 213 cooperate with the transition groove of the base plate 204. When one set of the first clearance grooves 221 on the receiving block 213 receives the screw, the other set of the first clearance grooves 221 matches the position of the transition groove, thereby realizing staggered feeding and improving the feeding efficiency of the screw (one side of the air pipe 223 is connected to an air pump through a pipe, which is used to circulate air into the air pipe 223, thereby blowing the screw that falls into the air pipe 223 into the screwdriver sleeve 133).

[0083] The second clearance groove 224 is located on the side of the receiving plate 216 away from the abutment wheel 220, and the second clearance groove 224 is arc-shaped, with its diameter between the diameters of the screw and the nut. The first guide portion 225 is inclinedly disposed on both sides of the second clearance groove 224, ensuring that the screw smoothly enters the second clearance groove 224 through the guidance of the first guide portion 225.

[0084] like Figure 13 As shown, the screw-on principle of the screw-on structure is as follows:

[0085] Since the front top 210 is closer to the receiving block 213 than the rear retracted portion 211, when the pushing cylinder 207 moves the receiving block 213 to the receiving position ( Figure 13The left receiving structure is A, and the right receiving structure is B. The receiving structure is composed of a receiving plate 216, a driving block 217, a resistance wheel 220, a second spring 219, and a second avoiding groove 224. At this time, the resistance wheel A rolls to contact the front top 210. For the convenience of explaining the screw feeding principle, the resistance wheel of the receiving structure A is defined as the resistance wheel A, and the subsequent is similar. The driving block A and the receiving plate A are pushed to the side close to the feeding frame 200, and the second spring A is compressed at this time;

[0086] As the receiving plate A is pushed to the side close to the feeding frame 200, as shown in the figure, when the screws in the feeding groove 201 move forward, the screw rod of the screw enters the second avoiding groove A, and the screw nut is resisted on the upper surface of the receiving plate A (i.e. the screw nut is resisted above the second avoiding groove A). Under the support of the receiving plate A, the screw will not fall down. At this time, the receiving structure A completes the receiving action; Figure 15

[0087] The pushing cylinder 207 drives the receiving block 213 to continue to move forward to the discharging position. At this time, the receiving structure B repeats the action of the receiving structure A to receive the screw. In the process of moving forward, the receiving structure A, the resistance wheel A gradually contacts the rear shrink part 211 from the front top 210 along the connecting part 212. Due to the fact that the rear shrink part 211 is away from the receiving block 213, under the action of the second spring A, the receiving plate A and the driving block A are pushed to the side away from the feeding frame 200. When the resistance wheel A is in full contact with the rear shrink part 211, the receiving plate A is completely returned to the receiving block 213. At this time, the screw falls into the air pipe 223 below along the discharging groove 222 of the receiving block 213 and the transition groove of the bottom plate 204 due to the lack of support. One side of the air pipe 223 is connected with the air pump through the pipeline, which is used for air supply to the air pipe 223, so as to blow the screw falling into the air pipe 223 into the screw driver sleeve 133. When the receiving block 213 is returned under the driving of the pushing cylinder 207, the receiving structure B repeats the action of the receiving structure A to send the screw into another air pipe 223, and the receiving structure A repeats the receiving action. By setting two groups of receiving structures to cooperate with the inner side track of the top plate 209, the alternate receiving and discharging of the screw are realized, so as to improve the efficiency of screw feeding.

[0088] Figure 16 17 As shown in the figure, it is a structure diagram of the detection structure. The detection structure is close to the conveying belt. The detection structure includes a bearing assembly, a bending assembly, and a detection assembly. The operator takes the pipeline with the screw lock on the conveying belt and places it on the bearing assembly. The bending assembly is used to drive the pipeline to rotate between 0° and 90°. The detection assembly is used for air tightness detection of the pipeline at 0° and 90°.

[0089] ​​​The bearing assembly comprises a detection table 300, a support plate 301, a clamping plate 302, a clamping groove 303, a second pressing cylinder 311, a third cylinder mounting plate 312, a third pressing cylinder 313, a pressing block 314, a support frame 327, an avoiding hole 332 and a contact head 333. The bottom of the detection table 300 is provided with universal casters, the detection table 300 is supported away from the ground by the universal casters, and ground water is prevented from causing the bottom surface of the detection table 300 to be corroded. The support plate 301 is fixed on the top of the detection table 300 in a screw-fastening mode. The clamping plate 302 comprises a plurality of plates, is fixed on the top of the support plate 301 in a welding mode and is arranged at intervals. The clamping groove 303 is formed in the top of the clamping plate 302 and is matched with the bottom surface of the pipeline. An operator places the pipeline with the screw locked on the conveying belt in the clamping groove 303 of the clamping plate 302, and the stability of the pipeline support is improved by arranging a plurality of clamping plates 302.

[0090] The support frame 327 is formed by welding aluminum profiles and is fixed on the top of the detection table 300. The third cylinder mounting plate 312 is fixed on one side of the support frame 327. In order to improve the structural strength of the third cylinder mounting plate 312, a reinforcing rib is fixed between the third cylinder mounting plate 312 and the support frame 327, and two straight angle edges of the reinforcing rib are respectively arranged on the support frame 327 and the third cylinder mounting plate 312. The cylinder body of the third pressing cylinder 313 is fixed on the third cylinder mounting plate 312 in a screw-fastening mode. The piston rod of the third pressing cylinder 313 is fixed with the pressing block 314 through the third cylinder mounting plate 312. The pressing block 314 is driven by the third pressing cylinder 313 to descend to the upper surface of the pipeline, the pipeline is prevented from being turned over when the bending assembly bends the pipeline, and the insertion position of the insertion pipe 307 is prevented from deviating due to the rotation of the pipeline during the airtightness detection.

[0091] The second pressing cylinder 311 is fixed on the top of the detection table 300 and is pressed on the upper surface of the pipeline, so that the insertion position of the first sensor 310 is prevented from deviating due to the deviation of the pipeline during the detection of the pipeline (the second pressing cylinder 311 can be selected from the ACK series of commercially available corner cylinders).

[0092] As shown in Figure 18 The avoiding hole 332 penetrates one of the clamping plates 302 and the support plate 301 in the vertical direction. The bottom of the detection table 300 is fixed with a lifting cylinder, and the contact head 333 is fixed on the piston rod of the lifting cylinder and arranged in the avoiding hole 332. The contact head 333 is lifted and lowered in the avoiding hole 332 by the lifting cylinder. After the pipeline is placed on the clamping plate 302, the pipeline is pressed on the clamping plate 302 by the second pressing cylinder 311 and the third pressing cylinder 313, the contact head 333 is lifted to match the bottom groove structure of the pipeline, and the stability of the pipeline clamping is improved.

[0093] The bending assembly comprises a rotary cylinder 315, a rotating plate 316, an extension plate 317, a fixing rod 318, a contact wheel 319, a containing groove 320, a limiting nut 321, a limiting frame 322, a clamping plate 323, a clamping groove 324, a second guide part 325 and an arc part 326. As shown in Figure 18 The cylinder body of the rotary cylinder 315 is fixed on the top of the detection table 300 by screwing, and the rotary cylinder 315 can be selected from the commercially available HRQ series rotary cylinder. The rotating plate 316 is fixed on the rotating part of the rotary cylinder 315 by screwing, and the rotating plate 316 is driven to rotate by the rotary cylinder 315. The extension plate 317 has two parts, which are integrally connected to one side of the rotating plate 316 and rotate synchronously with the rotating plate 316. The fixing rod 318 is installed on the side of the extension plate 317 away from the rotating plate 316 (specifically, the fixing rod 318 is a threaded rod, and the side of the extension plate 317 away from the rotating plate 316 is provided with a threaded hole, and the threaded rod is installed in the threaded hole of the extension plate 317 by screwing).

[0094] The contact wheel 319 is sleeved on the fixing rod 318. Specifically, the fixing rod 318 comprises a screw rod part and a screw head part which are integrally connected, the outer periphery of the screw rod part is provided with threads, and the screw rod part is installed in the threaded hole of the extension plate 317 by screwing; the contact wheel 319 is provided with a through mounting hole in the axial direction, and the diameter of the mounting hole is slightly larger than the outer diameter of the screw rod part, so that the contact wheel 319 can be installed on the screw rod part and abut against the side of the screw head part close to the screw rod part.

[0095] The limiting nut 321 is screwed on the screw rod part and abuts against the side of the contact wheel 319 away from the screw head part, and the contact wheel 319 is limited by the limiting nut 321 and the screw head part, so as to avoid the contact wheel 319 from deviating and causing the pipe to twist when the pipe is bent. The containing groove 320 is provided on the outer periphery of the contact wheel 319, and the cross section of the containing groove 320 is arc-shaped, which limits the pipe placed therein and avoids the pipe from deviating to the two sides and twisting when the pipe is bent.

[0096] As shown in Figure 18 When the pipe is bent, the lower contact wheel 319 is used to bend the pipe upward, and when the rotary cylinder 315 is reset, the bent pipe is abutted to the horizontal position by the other group of contact wheels 319.

[0097] As shown in Figure 19As shown, the limiting frame 322 is fixed on one side of the support frame 327 by screw fastening, and the limiting frame 322 is in the shape of “L”. In order to improve the structural strength of the limiting frame 322, a reinforcing plate is fixed on the inner side of the “L” shaped limiting frame 322. Specifically, the two straight edges of the reinforcing plate are respectively abutted on the two sides of the “L” shaped limiting frame 322. The clamping plate 323 has two pieces, which are fixed on one side of the limiting frame 322 by screw fastening and are arranged in a spaced manner. The clamping groove 324 is formed between the two clamping plates 323. After the pipeline is bent, it is rotated into the clamping groove 324, so as to ensure that the pipeline will not be twisted to both sides when it is bent, thereby avoiding affecting the subsequent air tightness detection.

[0098] The second guide part 325 is obliquely arranged on the inner side of the two clamping plates 323, and guides the pipeline rotated into the clamping groove 324. The arc-shaped part 326 is arranged on the inner side of the second guide part 325. The arrangement of the arc-shaped part 326 makes the second guide part 325 and the clamping groove 324 smoothly connected, thereby avoiding leaving marks on the outer side wall of the pipeline when the pipeline is bent.

[0099] As shown, Figure 17 The detection assembly is used for detecting the air tightness of the pipeline at two extreme positions of 0° and 90°. The detection assembly comprises a first sliding table air cylinder 304, a first sliding plate 305, a fixed plate 306, a pipe 307, a second sliding table air cylinder 308, a second sliding plate 309, a first sensor 310, a vertical plate 328, a third linear sliding table 329, a third sliding plate 330 and a second sensor 331. The first sliding table air cylinder 304 and the second sliding table air cylinder 308 are both fixed on the top of the support plate 301 by screw fastening, and are located on both sides of the pipeline.

[0100] The first sliding plate 305 is fixed on the sliding part of the first sliding table air cylinder 304 by screw fastening. The fixed plate 306 is fixed on the top of the first sliding plate 305 by screw fastening, and the opposite sides of the first sliding plate 305 and the fixed plate 306 are provided with an adaptive slot of the pipe 307. The pipe 307 is installed between the first sliding plate 305 and the fixed plate 306. The outer side of the pipe 307 is connected with the air pump through a flexible pipe.

[0101] The second sliding plate 309 is fixed on the sliding part of the second sliding table air cylinder 308 by screw fastening. The first sensor 310 is fixed on the second sliding plate 309. When the pipeline is placed in the clamping groove 324 of the clamping plate 323, the first sliding table air cylinder 304 and the second sliding table air cylinder 308 respectively drive the pipe 307 and the first sensor 310 to move inward, and are respectively inserted into both ends of the pipeline. Then, whether the pipeline leaks in the horizontal state is detected.

[0102] The vertical plate 328 is vertically fixed on the top of the support frame 327, the third linear slide 329 is fixed on one side of the vertical plate 328, the third slide plate 330 is fixed on the sliding part of the third linear slide 329 by screwing, and the third slide plate 330 is driven to rise and fall by the third linear slide 329. The second sensor 331 is fixed on the third slide plate 330, when the bending assembly drives the pipe to bend 90° to the pipe against the clamping groove 324, the third linear slide 329 drives the third slide plate 330 to descend, so that the second sensor 331 inserts into the other end of the pipe, detects whether the pipe leaks under the condition of being bent to 90°.

[0103] The detection principle of the detection assembly is as follows:

[0104] During detection, the operator takes the pipe which has completed screw locking from the conveying belt and places it in the clamping groove 303. Then, the second pressing cylinder 311 and the third pressing cylinder 313 act in conjunction to press and fix the pipe in the clamping groove 303. This pressing operation effectively prevents the pipe from rotating or moving in the subsequent insertion process, ensuring the accuracy of the detection position. When the pipe is stably fixed and in a horizontal state, the first slide cylinder 304 drives the pipe insertion 307 to move to one end of the pipe until it is inserted into the pipe port and forms a sealed connection; at the same time, the second slide cylinder 308 drives the first sensor 310 to move to the other end of the pipe until it is connected to the pipe port and forms a sealed connection. After the pipe insertion 307 and the first sensor 310 are in place, the external air pump introduces a predetermined pressure of detection medium (such as gas) into the pipe through the pipe insertion 307, and the first sensor 310 at the other end of the pipe is used to monitor the pressure change in the pipe, so as to judge whether the pipe leaks in the horizontal state (the first sensor 310 is a pressure sensor for monitoring the pressure change in the pipe. By judging whether the pressure is lower than the preset threshold value within a predetermined time, it can be judged whether the pipe leaks);

[0105] Then the second pressing cylinder 311 releases the pressing of the pipe, the pipe is driven upward by the bending assembly to bend to the clamping groove 324 (when the pipe is bent, the contact wheel 319 below is used to bend upward against the pipe), the third linear slide 329 drives the third slide plate 330 to descend, so that the second sensor 331 moves to the other end of the pipe until it is connected to the pipe port and forms a sealed connection, detects whether the pipe leaks under the condition of being bent to 90°, and when the rotary cylinder 315 is reset after detection, the bent pipe is pressed to be horizontal by another set of contact wheels 319.

[0106] The above examples are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and to implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. An assembly device for vacuum cleaner tubing, characterized in that, It includes: A screw-locking structure, comprising a feeding assembly for supporting a pipe, a screw-locking assembly disposed above the feeding assembly for locking screws on both sides of the pipe, and a transfer assembly disposed on one side of the screw-locking assembly for transferring the pipe after the screws are fastened. A screw-on structure for transferring a screw to the screw-locking assembly; The screw-on structure includes a feeding rack (200) for conveying screws, a support frame fixed to the outlet side of the feeding rack (200), a receiving block (213) slidably installed in the support frame, an air pipe (223) installed at the bottom of the support frame, and a picking mechanism provided in the receiving block (213). The picking mechanism alternately receives screws from the outlet side of the feeding rack (200) and transfers them into the air pipe (223). The material handling mechanism includes a first clearance groove (221) opened on the side of the receiving block (213) near the feeding rack (200), a drop groove (222) that passes through the receiving block (213) vertically and connects the first clearance groove (221) and the air pipe (223), a through groove (215) that passes through the receiving block (213) and connects to the first clearance groove (221), a receiving plate (216) that is slidably inserted into the through groove (215), and a second clearance groove (224) opened on the side of the receiving plate (216) near the feeding rack (200); When the receiving plate (216) is in the receiving position, the receiving plate (216) extends to receive the screws on the feeding rack (200); When the receiving plate (216) is in the dropping position, the receiving plate (216) retracts to release the support of the screw; The detection structure includes a bearing assembly for supporting the pipe after screw fastening, a bending assembly disposed on one side of the bearing assembly and driving the pipe to rotate between two extreme positions of 0° and 90°, and a detection assembly for performing airtightness detection on the pipe at the two extreme positions of 0° and 90°. The bearing assembly includes a testing platform (300), clamping plates (302) fixed to the top of the testing platform (300) and spaced apart, a clamping groove (303) opened on the top of the clamping plate (302), and a pressure block (314) pressed onto the pipe; The bending assembly includes a rotating plate (316) rotatably mounted on the top of the testing table (300), two connecting plates (125) integrally connected to one side of the rotating plate (316), a contact wheel (319) mounted on the side of the connecting plate (125) away from the rotating plate (316), a receiving groove (320) opened on the outside of the contact wheel (319), a limiting frame (322) fixed on the top of the testing table (300), a clamping plate (323) fixed on one side of the limiting frame (322) and spaced apart, and a slot (324) formed between the clamping plates (323). When the pipe is bent to 90°, the pipe is inserted into the slot (324).

2. The assembly equipment for vacuum cleaner tubing according to claim 1, characterized in that: The feeding assembly includes a frame (100), a carrier that is movable along the Y-axis on the top of the frame (100), and a clamping unit that is rotatably mounted on the top of the carrier. The clamping unit is used to clamp the pipe and drive it to rotate in both directions. The screw fastening assembly fastens screws to the two side walls of the pipe.

3. The assembly equipment for vacuum cleaner tubing according to claim 2, characterized in that: The screw fastening assembly includes a gantry frame (117) mounted above the frame (100), a movable frame (118) movably disposed on one side of the gantry frame (117) along the X-axis, a lifting plate (119) vertically mounted on one side of the movable frame (118), a screwdriver sleeve (133) fixed to the bottom of the lifting plate (119), and an electric screwdriver bit (123) height-adjustable disposed on one side of the lifting plate (119) and cooperating with the screwdriver sleeve (133).

4. The assembly equipment for vacuum cleaner tubing according to claim 3, characterized in that: The transfer assembly includes a transfer plate (135) movable along the Y-axis on one side of the gantry (117), a mounting bracket (137) vertically mounted on one side of the transfer plate (135), and clamping units adjustablely mounted on both sides of the mounting bracket (137), the clamping units being used to clamp the pipe after screw fastening.

5. The assembly equipment for vacuum cleaner tubing according to claim 1, characterized in that: The material handling mechanism further includes a top plate (209) fixed on the side of the support frame away from the feeding frame (200), a front top (210) disposed on the inner side of the top plate (209), a rear retracted portion (211) disposed on both sides of the front top (210), a connecting portion (212) connecting the front top (210) and the rear retracted portion (211) and disposed at an inclination, a drive block (217) integrally connected to one side of the receiving plate (216) and elastically connected to the receiving block (213), and a stop wheel (220) rotatably mounted in the drive block (217); When the receiving plate (216) is in the receiving position, the abutment wheel (220) contacts the front top (210) and pushes the receiving plate (216) out; When the receiving plate (216) is in the dropping position, the abutment wheel (220) contacts the retracted portion (211) to retract the receiving plate (216).

6. The assembly equipment for vacuum cleaner tubing according to claim 1, characterized in that: The detection assembly includes a tube (307) movably disposed on the top of the detection platform (300) and located on both sides of the pipe, a first sensor (310), and a second sensor (331) movably disposed above the limit frame (322). The tube (307) is inserted into one end of the pipe. When the pipe is in a horizontal state, the first sensor (310) is inserted into the other end of the pipe; When the pipe is bent to 90°, the second sensor (331) is inserted into the other end of the pipe.

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