A tractor-drawn hand self-operated counter-cultivator

Abstract

The utility model belongs to agricultural machinery technical field discloses a tractor traction type hand -self -combined row -cultivator, and specific technical scheme is: including roof and the intermediate support connected below roof, is equipped with reversing gearbox and gear pump on roof, two whole machine depth limiting wheel groups are symmetrically installed on roof, the front end of roof is equipped with camera, roof is linked between the intermediate support through two groups of adjusting frame, the bottom of intermediate support is connected with weeding unit, the front end of chassis is equipped with multiple unit depth limiting wheel groups, the middle part of chassis is equipped with multiple weeding knives, the rear end of chassis is equipped with multiple weeding rake, the front end of each group weeding rake is connected with fertilizing pipe, and the fertilizing box is linked with corresponding fertilizing pipe through pipeline respectively, is equipped with command support on roof, is equipped with side -shift command control lever on command support, the utility model is equipped with manual control system and intelligent control system, and user can choose flexibly according to actual condition, and the applicability and reliability of equipment are improved greatly.

Description

Technical Field

[0001] This utility model belongs to the field of agricultural machinery technology, specifically relating to a tractor-drawn manual intelligent row tiller. Background Technology

[0002] In agricultural production, weeding and hoeing are important agricultural operations. Traditional methods mainly include manual weeding or the use of simple mechanical weeding equipment. Manual weeding is inefficient, labor-intensive, and costly, making it difficult to meet the needs of large-scale agricultural production. Existing mechanical weeding equipment suffers from poor row precision, unsatisfactory weeding results, and inflexible operation. Some equipment can only achieve single manual or intelligent control, failing to meet the needs of different operating scenarios and users. In complex terrain or small-area farmland, intelligent equipment may malfunction due to signal problems or terrain limitations, while manual operation lacks precision and efficiency. Therefore, developing a device with a manual / automatic integrated design capable of precise row-based weeding and hoeing is of significant practical importance. Utility Model Content

[0003] To address the problems of poor row alignment, difficulty in accurately weeding between crop rows, and easy damage to crops in existing weeding machines, this invention overcomes the limitations of a single operation mode and provides a flexible manual / automatic operation mode to meet the needs of different working environments and users, improve the weeding efficiency and stability of the weeding machine, and reduce labor intensity and operating costs.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a tractor-tethered manual-automatic inter-row tiller, including a top frame and an intermediate support connected below the top frame, a power base is provided on the top frame, the power base is arranged at the front end of the top frame, and a reversing gearbox and a gear pump are mounted on the power base. Two sets of depth-limiting wheels are symmetrically installed on the top frame; A monitoring rod is installed at the front end of the top frame, and a camera is installed at the top of the monitoring rod; The top frame and the intermediate support are connected by two sets of adjustment frames. The rear end of the adjustment frame is connected to the intermediate support, and the front end of the adjustment frame is hinged to the top frame. The adjustment frame has a transverse sliding groove. The cylinder of the side push cylinder is hinged to the top frame, and the cylinder rod of the side push cylinder is hinged to the slider. The slider is slidably connected in the transverse sliding groove on the corresponding side. The top frame is equipped with an oil tank and a solenoid valve; The middle support is movably connected to multiple weeding units, each including an upper crossbeam and a lower crossbeam. The upper crossbeam is movably mounted on the middle support via two clamps. The front and rear ends of the upper and lower crossbeams are connected by two sets of lifting devices. The front end of the lower crossbeam is equipped with a single-unit depth-limiting wheel set, and the middle of the lower crossbeam is equipped with multiple sets of weeding blades. The number of weeding blades is determined according to the amount of weeding.

[0005] The lifting device includes an upper lifting lug, a lifting rod, and a lower lifting lug. The upper lifting lug is fixedly connected to the upper crossbeam, and the lower lifting lug is fixedly connected to the lower crossbeam. The upper end of the lifting rod is hinged to the upper lifting lug, and the lower end of the lifting rod is hinged to the lower lifting lug. The bottom end of the curved rod is hinged to the lower lug on one side, and the top end of the curved rod passes through the upper lug on the other side and is limited by a locking cap. A spring is fitted on the curved rod. Depending on the cultivation needs, you can choose to connect the soil covering plate group or the weeding rake to the rear end of the lower crossbeam via a transition beam. You can choose to connect the soil covering plate group to the rear end of all the lower crossbeams, or you can choose to connect the weeding rake to the rear end of all the lower crossbeams, or you can choose to mix the soil covering plate group and the weeding rake.

[0006] A fertilizer box spanning the middle support is mounted on the middle support, and the fertilizer box is connected to the corresponding fertilizer pipe through pipes. The top frame is equipped with a command support, and the command support is equipped with a lateral movement control lever; The seats are mounted on the two connecting beams in the middle.

[0007] The depth limiting wheel assembly includes a first depth limiting wheel, a sleeve, and an insert rod. The first depth limiting wheel is rotatably mounted on the bottom of the insert rod. The upper section of the insert rod is inserted into the sleeve and fixed with bolts. The sleeve is movably mounted on the top frame with bolts.

[0008] The single depth limiting wheel assembly includes a second depth limiting wheel. One side of the second depth limiting wheel is hinged to the bottom end of the first support rod, and the top end of the first support rod is hinged to the corresponding lower crossbeam. The other side of the second depth limiting wheel is hinged to the bottom of the second support rod, the middle part of the second support rod is hinged to the lower crossbeam, and the top end of the second support rod is hinged to one end of the adjusting rod. The other end of the adjusting rod is locked by an adjusting ring, and the adjusting ring is rotatably connected to the corresponding lower crossbeam.

[0009] The weeding blade is connected to the lower crossbeam via an adjustment plate. The adjustment plate has multiple rows of adjustment holes, and the top of the weeding blade is connected to the corresponding adjustment hole by two bolts. The adjustment plate is also connected to the corresponding lower crossbeam by bolts.

[0010] The clamping component includes a clamping plate and two clamping blocks arranged at the bottom of the clamping plate. The two clamping blocks are clamped onto the intermediate bracket. Bolts pass through the clamping plate, the corresponding clamping blocks, and the upper crossbeam in sequence and are then locked by nuts.

[0011] Compared with the prior art, the specific beneficial effects of this utility model are reflected in the following aspects: I. High Flexibility: This utility model is equipped with a manual control system and an intelligent control system. The intelligent control system uses front-end cameras and sensors (visual sensors, position sensors, etc.) to acquire real-time information on crop rows and the position of the weeder. Through real-time analysis and processing, it automatically controls the row alignment and weeding operations of the weeder. The manual control system allows manual operation of the control lever to complete row alignment and weeding operations when the intelligent system malfunctions or is unsuitable for the terrain. The manual-automatic design enables the weeder to achieve automated and efficient operation when the intelligent system is working normally, and to complete the operation manually when the intelligent system malfunctions or is unsuitable for use. The two control systems can be quickly switched, and users can flexibly choose according to the actual situation, greatly improving the applicability and reliability of the equipment.

[0012] II. High Row Alignment Precision: This utility model uses a front-end camera to capture real-time images between crop rows. Analyzing the images using a publicly available image recognition algorithm identifies the position and direction of the crop rows. Based on the recognition results, the controller controls the weeder's steering mechanism, ensuring the weeder always operates within the crop rows. Combined with a position sensor, the weeder's position can be precisely located. This precise row alignment technology ensures the weeder operates accurately within the crop rows, effectively reducing damage to crops and improving weeding efficiency and crop yield.

[0013] 3. High weeding efficiency: This utility model adopts adjustable weeding blades. The height, angle and spacing of the blades can be adjusted according to different crops and weeding needs. The adjustable high-efficiency weeding mechanism can optimize the operation according to different weed conditions, improve weeding efficiency, and reduce operating costs and labor intensity. Attached Figure Description

[0014] Figure 1 The three-dimensional representation of this utility model Figure 1 .

[0015] Figure 2 The three-dimensional representation of this utility model Figure 2 .

[0016] Figure 3 This is the front view of the present invention.

[0017] Figure 4 This is a rear view of the present invention.

[0018] Figure 5 This is a side view of the present invention.

[0019] Figure 6 for Figure 5 A magnified view of a portion of point A in the middle.

[0020] Figure 7 This is a top view of the present invention.

[0021] In the diagram, 1 is the top frame, 11 is the power base, 12 is the gearbox, 13 is the gear pump, 14 is the overall depth-limiting wheel assembly, 141 is the first depth-limiting wheel, 142 is the sleeve, 143 is the insertion rod, 15 is the monitoring rod, 16 is the camera, 17 is the oil tank, 18 is the solenoid valve, 2 is the intermediate support, 3 is the adjustment frame, 31 is the transverse slide, 32 is the side-push cylinder, 33 is the slider, 4 is the weeding unit, 41 is the unit depth-limiting wheel assembly, 411 is the second depth-limiting wheel, 412 is the first support rod, and 413 is... The second support rod, 414 is the adjusting rod, 415 is the adjusting ring, 42 is the soil covering plate assembly, 43 is the weeding knife, 431 is the adjusting plate, 432 is the adjusting hole, 44 is the weeding rake, 45 is the fertilizer pipe, 46 is the fertilizer box, 47 is the lifting device, 471 is the upper lifting lug, 472 is the lifting rod, 473 is the lower lifting lug, 474 is the upper crossbeam, 475 is the lower crossbeam, 48 is the clamp, 481 is the clamping plate, 482 is the clamping block, 49 is the arc rod, 491 is the spring, 5 is the side shift control lever, and 6 is the seat. Detailed Implementation

[0022] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0023] like Figure 1-7 As shown, a tractor-trailer-driven manual-automatic inter-row tiller includes a top frame 1 and an intermediate support 2 connected below the top frame 1. The top frame 1 is equipped with a power base 11, which is located at the front end of the top frame 1. The power base 11 is equipped with a reversing gearbox 12 and a gear pump 13. A transmission coupling is arranged at the front end of the reversing gearbox 12, which is connected to the power output shaft of the tractor. The gearbox 12 drives the gear pump 13 to work.

[0024] Two machine depth limiting wheel sets 14 are symmetrically installed on the top frame 1. The machine depth limiting wheel set 14 includes a first depth limiting wheel 141, a sleeve 142 and an insertion rod 143. The first depth limiting wheel 141 is rotatably installed at the bottom of the insertion rod 143. The upper section of the insertion rod 143 is inserted into the sleeve 142 and fixed with bolts. The extension length of the insertion rod 143 in the sleeve 142 can be adjusted according to different cultivation needs. After adjustment, the position of the insertion rod 143 in the sleeve 142 is locked with bolts, thereby adjusting the height of the first depth limiting wheel 141. The sleeve 142 is movably installed on the top frame 1 with bolts.

[0025] The front end of the top frame 1 is equipped with a monitoring rod 15, and the top of the monitoring rod 15 is equipped with a camera 16. The camera 16 acquires video information between rows, and then acquires image information through a visual sensor and position information through a position sensor.

[0026] The top frame 1 and the intermediate support 2 are connected by two sets of adjusting frames 3. The rear end of the adjusting frame 3 is connected to the intermediate support 2, and the front end of the adjusting frame 3 is hinged to the intermediate support 2. The adjusting frame 3 has a transverse sliding groove 31. The cylinder of the side push cylinder 32 is hinged to the top frame 1, and the cylinder rod of the side push cylinder 32 is hinged to the slider 33. The slider 33 is slidably connected in the transverse sliding groove 31 on the corresponding side. In this way, the side push cylinder 32, the adjusting frame 3, and the top frame 1 form a triangular support structure. The distance and relative position relationship between the intermediate support 2 and the top frame 1 are adjusted by the extension and retraction of the cylinder rod of the side push cylinder 32, thereby realizing the alignment function.

[0027] The top frame 1 is equipped with an oil tank 17 and a solenoid valve 18. The oil tank 17 supplies oil to the side thrust cylinder 32, and the solenoid valve 18 controls the oil supply to the side thrust cylinder 32.

[0028] Multiple weeding units 4 are movably connected to the upper part of the intermediate support 2. Each weeding unit 4 includes an upper crossbeam 474 and a lower crossbeam 475 arranged in parallel. The upper crossbeam 474 is movably installed on the top frame 1 by two clips 48. The upper crossbeam 474 can slide laterally on the top frame 1 to adjust its position. The front and rear ends of the upper crossbeam 474 and the lower crossbeam 475 are connected by two sets of lifting devices 47. The upper crossbeam 474, the lower crossbeam 475 and the two sets of lifting devices 47 form a quadrilateral structure.

[0029] The front end of the lower crossbeam 475 is equipped with a single depth limiting wheel assembly 41, which includes a second depth limiting wheel 411. One side of the second depth limiting wheel 411 is hinged to the bottom end of the first support rod 412, and the top end of the first support rod 412 is hinged to the corresponding lower crossbeam 475. The other side of the second depth limiting wheel 411 is hinged to the bottom of the second support rod 413, and the middle part of the second support rod 413 is hinged to the lower crossbeam 475. The top of the second support rod 413 is hinged to one end of the adjusting rod 414, and the other end of the adjusting rod 414 is locked by an adjusting ring 415. The adjusting ring 415 is rotatably connected to the corresponding lower crossbeam 475. By adjusting the position of the adjusting rod 414 on the adjusting ring 415, the installation angle of the second support rod 413 relative to the lower crossbeam 475 is adjusted, thereby adjusting the installation height of the second depth limiting wheel 411.

[0030] Two sets of weeding blades 43 are installed in the middle of the lower crossbeam 475. The weeding blades 43 are connected to the lower crossbeam 475 through an adjusting plate 431. The adjusting plate 431 has multiple rows of adjusting holes 432. The top of the weeding blade 43 is connected to the corresponding adjusting hole 432 by two bolts. The adjusting plate 431 is connected to the corresponding lower crossbeam 475 by bolts. The height of the weeding blade 43 can be adjusted by adjusting the position of the weeding blade 43 on the adjusting plate 431.

[0031] The lifting device 47 includes an upper lifting lug 471, a lifting rod 472, and a lower lifting lug 473. The upper lifting lug 471 is fixedly connected to the upper crossbeam 474. The upper end of the lifting rod 472 is hinged to the upper lifting lug 471. The lower lifting lug 473 is fixedly connected to the lower crossbeam 475. The lower end of the lifting rod 472 is hinged to the lower lifting lug 473.

[0032] The weeding unit 4 also includes an arc-shaped rod 49, the bottom end of which is hinged to a lower lug 473 on one side, and the top end of which passes through an upper lug 471 on the other side and is limited by a locking cap. A spring 491 in a compressed state is fitted on the arc-shaped rod 49, and the gap between the upper crossbeam 474 and the lower crossbeam 475 is elastically adjustable.

[0033] During operation, the second depth limiting wheel 411 rests against the soil. The position of the second depth limiting wheel 411 can be adjusted up and down according to the undulation of the soil. When the second depth limiting wheel 411 rises, it drives the lower crossbeam 475 to move upward, reducing the distance between the lower crossbeam 475 and the upper crossbeam 474. The length of the upper end of the arc rod 49 extending to the outside of the upper crossbeam 474 increases, the compression length of the spring 491 shortens, and the elastic force increases. When the second depth limiting wheel 411 falls, it drives the lower crossbeam 475 to move downward, increasing the distance between the lower crossbeam 475 and the upper crossbeam 474. The length of the upper end of the arc rod 49 extending to the outside of the upper crossbeam 474 decreases, the compression length of the spring 491 increases, and the elastic force decreases.

[0034] The rear ends of the two outermost lower crossbeams 475 are each equipped with a soil covering plate assembly 42 via a transition beam. The soil covering plate assembly 42 consists of two soil covering plate assemblies 42 arranged at a certain angle.

[0035] The rear ends of the multiple lower crossbeams 475 located in the middle are all equipped with weed rakes 44 via transition beams, and the height of the weed rakes 44 is adjustable.

[0036] Each weeding rake 44 is connected to a fertilizer pipe 45 at its front end, and the fertilizer pipe 45 is arranged at the front end of the corresponding weeding rake 44.

[0037] A fertilizer box 46 spanning the intermediate support 2 is installed on the intermediate support 2. The fertilizer box 46 is connected to the corresponding fertilizer pipe 45 through pipes. The fertilizer in the fertilizer box 46 is applied into the soil through multiple fertilizer pipes 45.

[0038] The top frame 1 is equipped with a command support, and the command support is equipped with a side shift command lever 5. In manual operation, the operation of the side push cylinder 32 is adjusted by the side shift command lever 5. The side shift command lever 5 can be completed by the existing manual operation system.

[0039] Seat 6 is mounted on the two intermediate transition beams and is positioned close to the lateral movement control lever 5.

[0040] The clamping component 48 includes a clamping plate 481 and two clamping blocks 482 arranged at the bottom of the clamping plate 481. The two clamping blocks 482 are clamped on the intermediate support 2. The bolt passes through the clamping plate 481, the corresponding clamping block 482, and the upper crossbeam 474 in sequence and is locked by a nut. After loosening the nut, the lateral position of the weeding unit 4 on the intermediate support 2 is adjusted. After positioning, tightening the nut can lock the position of the weeding unit 4.

[0041] A weeding trial was conducted in a cornfield. First, based on the corn row spacing and growth status, the height, angle, and spacing of the weeding blades 43 of the weeding machine were manually adjusted to set initial parameters. Then, the control system was activated, and the camera 16 and vision sensor began to collect real-time images of the crop rows. Based on the image analysis results, the weeding machine was automatically controlled to align with the rows. During operation, in areas with slightly undulating terrain, brief signal interference and instability occurred. The operator quickly switched to manual operation mode and smoothly controlled the weeding machine to continue operation by moving the control lever 5. Once the signal stabilized, the machine was switched back to intelligent mode to continue operation. Throughout the entire operation, the weeding machine aligned accurately with the rows, achieved good weeding results, and caused minimal damage to the corn plants. The operating efficiency was 30% higher than that of traditional weeding machines.

[0042] The top frame 1 of this utility model is made of high-strength alloy material, which takes into account both lightweight and deformation resistance. It is connected to the main unit through an independent hydraulic drive system. The lateral displacement and angle adjustment of the intermediate support 2 can be realized through manual control or intelligent control. Regardless of the mode, the entire machine can achieve rapid response, so that the weeding blade 43 always maintains the optimal distance from the crop row (the error can be controlled within 3cm), improving the row accuracy by about 20% and effectively reducing crop damage caused by row deviation.

[0043] Compared to traditional implements, this machine is 30% shorter overall, with the implement length controlled within 2.3m. Combined with the tractor's flexible steering performance, the minimum turning radius can be as low as 3m, enabling it to cope with a variety of complex scenarios.

[0044] The towed layout separates the power source from the working mechanism. The tractor provides traction power, while the weeder focuses on execution, avoiding the power loss of self-propelled equipment. It also allows for flexible adjustment of the working range according to the tractor's power, with lateral sway controlled within 30cm. The overall weight of the equipment is kept under 500kg, resulting in low soil compaction, making it particularly suitable for seedling fields and reducing soil compaction caused by mechanical operations.

[0045] This invention incorporates a fertilization system into the machine. By adjusting the fertilization pipe 45 and the weeding blade 43 to operate synchronously, fertilization can be applied simultaneously while weeding, combining the two processes into one. This avoids repeated compaction that could affect crop growth and greatly improves work efficiency.

[0046] This invention is specifically designed for weeding field crops such as corn, soybeans, and sorghum. The equipment can complete three rounds of weeding from the seedling stage to before jointing: the first round (seedling stage) removes surface-level shallow-rooted weeds to protect seedling growth; the second round (tillering stage) penetrates 3-5 cm into the soil to remove the roots of perennial weeds; the third round (before jointing) adjusts the blade angle to avoid touching the crop stems and removes residual weeds between rows. Furthermore, by changing the specifications of the row support frame and fertilizer application components, the equipment can also be adapted to more than 10 other crops such as rice, peanuts, and vegetables, significantly reducing farmers' equipment investment costs.

[0047] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model shall be included within the scope of the present utility model.

Claims

1. A tractor-drawn, manual / automatic, row-to-row tiller, characterized in that, Includes a top frame (1) and an intermediate support (2) connected below the top frame (1). The top frame (1) is provided with a power base (11), which is located at the front end of the top frame (1). The power base (11) is equipped with a reversing gearbox (12) and a gear pump (13). Two machine depth-limiting wheel sets (14) are symmetrically installed on the top frame (1); The front end of the top frame (1) is equipped with a monitoring rod (15), and the top of the monitoring rod (15) is equipped with a camera (16). The top frame (1) and the intermediate support (2) are connected by two sets of adjustment frames (3). The rear end of the adjustment frame (3) is connected to the intermediate support (2), and the front end of the adjustment frame (3) is hinged to the top frame (1). The adjustment frame (3) has a transverse sliding groove (31). The cylinder of the side push cylinder (32) is hinged to the top frame (1), and the cylinder rod of the side push cylinder (32) is hinged to the slider (33). The slider (33) is slidably connected in the transverse sliding groove (31) on the corresponding side. The top frame (1) is equipped with an oil tank (17) and a solenoid valve (18). Multiple weeding units (4) are movably connected to the upper part of the intermediate support (2). Each weeding unit (4) includes an upper crossbeam (474) and a lower crossbeam (475). The upper crossbeam (474) is movably installed on the intermediate support (2) through two clamps (48). The front and rear ends of the upper crossbeam (474) and the lower crossbeam (475) are connected by a lifting device (47). The front end of the lower crossbeam (475) is equipped with a single depth limiting wheel set (41), and the middle part of the lower crossbeam (475) is equipped with multiple sets of weeding blades (43). The lifting device (47) includes an upper lifting lug (471), a lifting rod (472) and a lower lifting lug (473). The upper lifting lug (471) is fixedly connected to the upper crossbeam (474), and the lower lifting lug (473) is fixedly connected to the lower crossbeam (475). The upper end of the lifting rod (472) is hinged to the upper lifting lug (471), and the lower end of the lifting rod (472) is hinged to the lower lifting lug (473). It also includes an arc rod (49), the bottom end of which is hinged to a lower lug (473) on one side, and the top end of which passes through an upper lug (471) on the other side and is limited by a locking cap. A spring (491) is fitted on the arc rod (49). The rear end of the lower crossbeam (475) is connected to a soil covering plate assembly (42) or a weeding rake (44) via a transition beam. A fertilizer box (46) spanning the intermediate support (2) is mounted on the intermediate support (2), and the fertilizer box (46) is connected to the corresponding fertilizer pipe (45) through pipes; The top frame (1) is equipped with a command support, and the command support is equipped with a lateral shift command control lever (5). It also includes a seat (6), which is mounted on the two intermediate transition beams.

2. A tractor-drawn hand-operated combined counter-cultivator according to claim 1, characterized in that The whole machine depth limiting wheel assembly (14) includes a first depth limiting wheel (141), a sleeve (142) and a plug rod (143). The first depth limiting wheel (141) is rotatably installed at the bottom of the plug rod (143). The upper section of the plug rod (143) is inserted into the sleeve (142) and fixed by bolts. The sleeve (142) is movably installed on the top frame (1) by bolts.

3. The tractor-drawn hand-operated combined counter-rotating cultivator according to claim 2, characterized in that, The single depth limiting wheel assembly (41) includes a second depth limiting wheel (411). One side of the second depth limiting wheel (411) is hinged to the bottom end of the first support rod (412). The top end of the first support rod (412) is hinged to the corresponding lower crossbeam (475). The other side of the second depth limiting wheel (411) is hinged to the bottom of the second support rod (413). The middle part of the second support rod (413) is hinged to the lower crossbeam (475). The top of the second support rod (413) is hinged to one end of the adjusting rod (414). The other end of the adjusting rod (414) is locked by the adjusting ring (415). The adjusting ring (415) is rotatably connected to the corresponding lower crossbeam (475).

4. The tractor-drawn hand-operated combined counter-rotating cultivator according to claim 3, characterized in that, The weeding blade (43) is connected to the lower crossbeam (475) via an adjusting plate (431). The adjusting plate (431) has multiple rows of adjusting holes (432). The top of the weeding blade (43) is connected to the corresponding adjusting hole (432) by two bolts. The adjusting plate (431) is connected to the corresponding lower crossbeam (475) by bolts.

5. The tractor-drawn hand-operated combined counter-rotating cultivator according to claim 4, characterized in that, The clamp (48) includes a clamp plate (481) and two clamp blocks (482) arranged at the bottom of the clamp plate (481). The two clamp blocks (482) are clamped on the intermediate bracket (2). The bolt passes through the clamp plate (481), the corresponding clamp block (482), and the upper crossbeam (474) in sequence and is then locked by a nut.

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