Broken pile treatment auxiliary device for reinforced concrete cast-in-place pile

Abstract

The utility model discloses a broken pile processing auxiliary device for a reinforced concrete cast-in-place pile, which belongs to the technical field of pile foundation repair, and comprises a bearing frame arranged above the broken pile, the bearing frame is movably connected with a plurality of support columns, the bearing frame is rotatably connected with a positioning frame, and the positioning frame can rotate relative to the bearing frame; a positioning pulley and a balancing weight are movably connected to the positioning frame, and a winch is fixedly arranged on the bearing frame. And one end of the steel wire rope passes through the positioning pulley and then is used for hoisting the water milling drilling machine or the hoisting bucket. By adjusting the position of the positioning pulley on the positioning frame, it is guaranteed that when the water mill drilling machine is hoisted, the pile drilling position of the water mill drilling machine is a certain distance away from the broken pile edge, and then the thickness of a pile body excavation wall protection layer is guaranteed; therefore, the cutting position can be accurately controlled, construction is facilitated, and the construction quality is guaranteed. And meanwhile, the stability of the device can be ensured by adjusting the position of a counterweight block on the counterweight I-shaped steel frame.

Description

Technical Field

[0001] The utility model belongs to the technical field of pile foundation repair, and particularly relates to an auxiliary device for treating broken piles of reinforced concrete cast-in-place piles. Background Technique

[0002] The statements in this part only provide background technical information related to the utility model, and do not necessarily constitute prior art.

[0003] A broken pile means that during the concrete pouring of a cast-in-place pile, slurry or gravel is mixed in the pile body, resulting in the concrete being separated into upper and lower sections, making it difficult for the bearing capacity of a single pile to meet the design requirements.

[0004] Patent CN108301401A discloses a construction method for treating defective sections of cast-in-place piles using a water mill drill. The water mill drill is used to break the pile body of the cast-in-place pile layer by layer until the defective section, the defective section is removed, and then the method of splicing the pile is adopted to complete the treatment of the defective pile.

[0005] When treating large-diameter piles or defective positions buried deeper with this broken pile treatment method, due to the lack of professional auxiliary operation devices, the construction process is relatively difficult and the construction quality is difficult to control. Content of the Utility Model

[0006] Aiming at the above problems, the utility model provides an auxiliary device for treating broken piles of reinforced concrete cast-in-place piles, which is convenient for construction and can accurately control the core drilling position to ensure construction quality.

[0007] To achieve the above purpose, the utility model adopts the following technical solutions:

[0008] An auxiliary device for treating broken piles of reinforced concrete cast-in-place piles includes a load-bearing frame arranged above the broken pile. The load-bearing frame is movably connected with multiple support columns, and the load-bearing frame is rotatably connected with a positioning frame, and the positioning frame can rotate relative to the load-bearing frame; a positioning pulley and a counterweight are movably connected to the positioning frame, and a winch is fixedly arranged on the load-bearing frame; a steel wire rope is arranged on the winch, and one end of the steel wire rope passes through the positioning pulley and then hoists a water mill drill or a skip bucket.

[0009] Preferably, the load-bearing frame includes a central frame, and the central frame is composed of a central disc and several support cross beams evenly distributed along the circumference of the central disc; a bushing hole is arranged at the center of the central disc, and a circular roller guide rail is also arranged on the central disc; a connecting flange is fixedly arranged at the end of the support cross beam far from the central disc.

[0010] Preferably, the load-bearing frame further includes a frame branch beam, and a connecting method flange is also provided at one end of the frame branch beam; a limiting plate is provided at the other end of the frame branch beam, and the frame branch beam is movably connected to the support column through a connecting ring; the inside of the connecting ring is hollow and can accommodate the frame branch beam; a limiting bolt hole is opened at the center of the top of the connecting ring and is threadedly connected to a limiting bolt.

[0011] Preferably, the support column is composed of two parts, including a sleeve rod, and a support rod is slidably connected inside the sleeve rod. Positioning holes are provided on the surface of the support rod, and a pin is provided at one end of the sleeve rod. The pin can be inserted into the positioning hole; a backing plate is fixedly connected to the other end of the sleeve rod; the top of the support rod is fixedly connected to the connecting ring.

[0012] Preferably, the positioning frame includes a hollow rotating shaft, and a limiting circular flange is fixedly connected to the top of the hollow rotating shaft; at the bottom of the limiting circular flange, a plurality of rollers are uniformly fixedly arranged along the same circumferential direction; the rollers rotate within the circular roller guide rail; the hollow rotating shaft can pass through the sleeve hole; a plumb bob is fixedly arranged at the center of the bottom end of the hollow rotating shaft; symmetric rotating handles are provided at the bottom of the hollow rotating shaft.

[0013] Preferably, a positioning I-shaped steel frame and a counterweight I-shaped steel frame are also fixedly connected to the hollow rotating shaft; a positioning pulley is movably connected to the positioning I-shaped steel frame, and a counterweight block is movably connected to the counterweight I-shaped steel frame.

[0014] Preferably, a first fixed pulley is provided at the top of the limiting circular flange; a second fixed pulley is provided inside the hollow rotating shaft; a third fixed pulley is fixedly arranged at the bottom of one end of the positioning I-shaped steel frame close to the hollow rotating shaft; a wire rope hole is opened on the hollow rotating shaft.

[0015] Preferably, the positioning pulley or the counterweight block is connected to the positioning I-shaped steel frame or the counterweight I-shaped steel frame through a movable positioning mechanism; a plurality of groups of positioning pin holes are opened on the lower flange of the positioning I-shaped steel frame or the counterweight I-shaped steel frame. Each group of positioning pin holes includes two, and each group of positioning pin holes is symmetrically arranged relative to the web of the positioning I-shaped steel frame or the counterweight I-shaped steel frame; the groups of positioning pin holes are arranged at intervals, and the interval distance of each group is the same.

[0016] Preferably, the movable positioning mechanism includes a positioning frame that can wrap the lower flange. The positioning frame is symmetrically structured relative to the I-shaped steel web, and a positioning spring pin is provided at the top of the positioning frame; the pin head of the positioning spring pin can be inserted into the positioning pin hole.

[0017] Preferably, the positioning pulley includes a pulley main body, and a pulley rotating shaft is fixedly arranged on the pulley main body. The pulley rotating shaft is rotatably connected to a pulley connecting rod; a counterweight connecting rod is arranged at the center of the counterweight block; the pulley connecting rod or the counterweight connecting rod is fixedly connected to the bottom of the positioning frame.

[0018] Compared with the prior art, the advantages and positive effects of the present utility model are:

[0019] The utility model can adjust the position of the connecting ring to adjust the support column to support on the ground outside the broken pile, accommodate the whole broken pile inside the device, and can coincide the plumb bob with the centroid of the broken pile to ensure that the device is directly above the broken pile; it can adjust the height of the support column in different directions to overcome the height difference on the ground outside the broken pile; it can adjust the position of the positioning pulley on the positioning I-beam frame to ensure that when hoisting the water mill drill, there is a certain distance between the drilling position of the water mill drill and the edge of the broken pile, so as to ensure the thickness of the retaining wall layer of the pile shaft excavation; thus, it can accurately control the cutting position, facilitate construction, and ensure the construction quality; at the same time, adjusting the position of the counterweight on the counterweight I-beam frame can ensure the balance on both sides of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The attached drawings forming a part of this specification are used to provide a further understanding of the utility model. The schematic embodiments and descriptions thereof of the utility model are used to explain the utility model and do not constitute an improper limitation to the utility model.

[0021] Figure 1 is the front view of the embodiment of the utility model;

[0022] Figure 2 is the top view of the load-bearing frame of the embodiment of the utility model;

[0023] Figure 3 is the side view of the movable positioning mechanism of the embodiment of the utility model;

[0024] Figure 4 is the top view of the core extraction of the broken pile of the embodiment of the utility model;

[0025] Figure 5 is the top view of the broken pile breaking the pile core of the embodiment of the utility model;

[0026] Figure 6 is the sectional view of the core extraction and pile core breaking of the broken pile of the embodiment of the utility model;

[0027] In the figure:

[0028] 1. Load-bearing frame; 11. Central frame; 12. Central disc; 121. Circular roller guide; 13. Support cross beam; 131. Lifting lug; 14. Bushing hole; 15. Connecting flange; 16. Frame branch beam; 17. Limit plate; 18. Connecting ring; 181. Limit bolt; 2. Support column; 21. Sleeve rod; 22. Support rod; 23. Positioning hole; 24. Pin; 25. Base plate; 3. Positioning frame; 31. Hollow rotating shaft; 32. Limit circular flange; 33. Roller; 34. Plumb bob; 35. Positioning I-shaped steel frame; 351. Movable positioning mechanism; 352. Positioning frame; 353. Positioning spring pin; 36. First fixed pulley; 37. Second fixed pulley; 38. Third fixed pulley; 39. Counterweight I-shaped steel frame; 4. Winch; 5. Positioning pulley; 51. Pulley body; 52. Pulley rotating shaft; 53. Pulley connecting rod; 6. Counterweight block; 61. Counterweight block connecting rod; 7. Steel wire rope; 8. Water mill drill rig. Detailed implementation mode

[0029] It should be noted that the following detailed description is illustrative and aims to provide further explanation of the present utility model. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present utility model belongs.

[0030] The following combines the drawings to describe the present utility model in detail. An auxiliary device for dealing with broken piles of reinforced concrete cast-in-place piles disclosed in this embodiment is as Figure 1 shown, including a load-bearing frame 1 arranged above the broken pile. The load-bearing frame 1 is movably connected to multiple support columns 2, and the load-bearing frame 1 is rotatably connected to a positioning frame 3. The positioning frame 3 can rotate relative to the load-bearing frame 1; a positioning pulley 5 and a counterweight block 6 are movably connected to the positioning frame 3, and a winch 4 is fixedly arranged on the load-bearing frame 1; a steel wire rope 7 is arranged on the winch 4, and one end of the steel wire rope 7 passes through the positioning pulley 5 and then hoists a water mill drill rig 8 or a skip bucket.

[0031] As Figure 2 shown, the load-bearing frame 1 includes a central frame 11, and the central frame 11 is composed of a central disc 12 and several support cross beams 13. The several support cross beams 13 are evenly distributed along the circumference of the central disc 12 and fixedly connected to the central disc 12; a bushing hole 14 is arranged at the center position of the central disc 12; a connecting flange 15 is fixedly arranged at the end of the support cross beam 13 far from the central disc 12. The support cross beam 13 is a square steel beam. A lifting lug 131 is also arranged on the support cross beam 13 for hoisting the load-bearing frame 1. The number of support cross beams 13 is an even number not less than 4.

[0032] As Figure 2As shown, the load-bearing frame 1 further includes a frame branch beam 16. One end of the frame branch beam 16 is also provided with a connecting flange 15. Bolt holes are opened on the connecting flange 15. The frame branch beam 16 and the support cross beam 13 are fixedly connected by high-strength bolts passing through the connecting flange 15. The other end of the frame branch beam 16 is provided with a limiting plate 17. The frame branch beam 16 is movably connected with the support column 2 through a connecting ring 18, and the connecting ring is fixedly connected with the support column 2. The frame branch beam 16 is a square steel beam.

[0033] In this embodiment, the inside of the connecting ring 18 is hollow and can accommodate the frame branch beam 16. Therefore, the connecting ring 18 can move in the length direction of the frame branch beam 16. A limiting bolt hole is opened at the center of the top of the connecting ring 18, and internal threads are provided in the hole for threaded connection with the limiting bolt 181. By tightening the limiting bolt 181, the connecting ring 18 cannot move horizontally relative to the frame branch beam 16, thereby restricting the support column 2 from moving horizontally. It can be understood that a protective plate or a rainproof cloth is also provided on the top of the load-bearing frame 1.

[0034] As Figure 1 、 Figure 2 shown, the cross-sectional length and width dimensions of the limiting plate 17 are larger than the cross-sectional dimensions of the connecting ring 18, which can prevent the connecting ring 18 from falling off the frame branch beam 16. It can be understood that the cross-sectional length and width dimensions of the limiting plate 17 are the same as those of the connecting flange 15.

[0035] As Figure 1 shown, the support column 2 is composed of two parts, including a sleeve rod 21. A support rod 22 is slidably connected inside the sleeve rod 21, and positioning holes 23 are opened on the surface of the support rod 22. One end of the sleeve rod 21 is provided with a pin 24, and the pin 24 can be inserted into the positioning hole 23 of the support rod 22. The other end of the sleeve rod 21 is fixedly connected with a backing plate 25. The top of the support rod 22 is fixedly connected with the connecting ring 18, and the bottom is sleeved inside the sleeve rod 21. It can be understood that the height of the support column 2 can be adjusted.

[0036] As Figure 1 、 Figure 2 shown, the positioning frame 3 includes a hollow rotating shaft 31. A limiting circular flange 32 is fixedly connected to the top of the hollow rotating shaft 31. It can be understood that the limiting circular flange 32 is hollow. At the bottom of the limiting circular flange 32, a plurality of rollers 33 are uniformly fixed along the same circumferential direction. A plumb bob 34 is fixedly arranged at the center of the bottom end of the hollow rotating shaft 31. It can be understood that the plumb bob 34 can freely lift relative to the bottom of the hollow rotating shaft 31. In this embodiment, a symmetrical rotating handle is also provided at the bottom of the hollow rotating shaft 31.

[0037] As Figure 1As shown in the figure, a circular roller guide 121 is provided on the central disk 12. The roller 33 rotates within the circular roller guide 121, and the hollow rotating shaft 31 can pass through the bushing hole 14. This enables the hollow rotating shaft 31 to rotate relative to the central disk 12 and also prevents the hollow rotating shaft 31 from falling out of the central disk 12.

[0038] In this embodiment, a positioning I-beam frame 35 and a counterweight I-beam frame 39 are also fixedly connected to the hollow rotating shaft 31. The positioning I-beam frame 35 and the counterweight I-beam frame 39 are symmetrically arranged relative to the hollow rotating shaft 31. A positioning pulley 5 is movably connected to the positioning I-beam frame 35, and a counterweight block 6 is movably connected to the counterweight I-beam frame 39. The positioning I-beam frame 35 is used for hoisting a water mill drill or a skip bucket, and the counterweight block 6 connected to the counterweight I-beam frame 39 is used to balance the stability of the positioning frame.

[0039] A first fixed pulley 36 is provided at the top of the limit circular flange 32; inside the hollow rotating shaft 31, below the positioning I-beam frame 35, a second fixed pulley 37 is provided; at the bottom of one end of the positioning I-beam frame 35 close to the hollow rotating shaft 31, a third fixed pulley 38 is fixedly provided; on the hollow rotating shaft 31, below the positioning I-beam frame 35, a wire rope hole is opened for the wire rope 7 to pass through. One end of the wire rope 7 on the winch 4 passes through the first fixed pulley 36, enters the hollow rotating shaft 31 through the limit circular flange 32, passes through the second fixed pulley 37, exits the hollow rotating shaft 31 through the wire rope hole, passes through the second fixed pulley 37, passes through the positioning pulley 5, and hangs down naturally. This end is used for hoisting.

[0040] As Figure 1 、 Figure 3 shown in the figure, the positioning pulley 5 or the counterweight block 6 is connected to the positioning I-beam frame 35 or the counterweight I-beam frame 39 through a movable positioning mechanism 351. A number of groups of positioning pin holes are opened on the lower web of the positioning I-beam frame 35 or the counterweight I-beam frame 39. Each group of positioning pin holes includes two, and each group of positioning pin holes is symmetrically arranged relative to the web of the positioning I-beam frame 35 or the counterweight I-beam frame 39; the groups of positioning pin holes are arranged at intervals, and the interval distance of each group is the same. The movable positioning mechanism 351 includes a positioning frame 352 that can wrap the lower web. The positioning frame 352 is symmetrically structured relative to the I-beam web. A positioning spring pin 353 is provided at the top of the positioning frame 352. The pin head of the positioning spring pin 353 can be inserted into the positioning pin hole. When the staff pulls the tail of the positioning spring pin 353, the pin head of the positioning spring pin 353 can be separated from the positioning pin hole, so that the movable positioning mechanism 351 can be moved relative to the positioning I-beam frame 35 or the counterweight I-beam frame 39. It can be understood that the positioning spring pin is a mature existing technology.

[0041] As Figure 3As shown, the positioning pulley 5 includes a pulley main body 51, and a pulley rotating shaft 52 is fixedly arranged on the pulley main body 51. The pulley rotating shaft 52 is rotatably connected to a pulley connecting rod 53. It can be understood that a counterweight connecting rod 61 is arranged at the center of the counterweight 6.

[0042] When the movable positioning mechanism 351 is connected to the positioning pulley 5, the bottom of the positioning frame 352 is fixedly connected to the pulley connecting rod 53 of the positioning pulley 5. When the movable positioning mechanism 351 is connected to the counterweight 6, the center of the bottom of the positioning frame 352 is fixedly connected to the counterweight connecting rod of the counterweight 6.

[0043] In this embodiment, according to the cross-sectional size of the broken pile, the position of the positioning pulley 5 on the positioning I-shaped steel frame 35 is adjusted to ensure that when hoisting the water mill drill, the drilling position of the water mill drill is not less than 280 mm away from the edge of the broken pile, thereby ensuring the thickness of the retaining wall layer for pile shaft excavation. In other implementation manners, the thickness of the retaining wall layer for pile shaft excavation is limited according to the actual situation. At the same time, the position of the counterweight 6 on the counterweight I-shaped steel frame 39 also needs to be adjusted to ensure the balance on both sides. When the hollow rotating shaft 31 rotates, the water mill drill rotates with the positioning I-shaped steel frame 35, and the rotation trajectory is a circle.

[0044] In some implementation manners, a limiter and an anti-disengagement safety bolt are arranged on the winch to prevent sudden falling during lifting.

[0045] Working principle:

[0046] Hoist the lifting load-bearing frame 1 above the broken pile, determine the centroid of the broken pile, and release the plumb bob 34 so that it can coincide with the centroid of the broken pile.

[0047] According to the cross-sectional size of the broken pile, adjust the positions of the plurality of connecting rings 18 so that the plurality of support columns 2 are located on the ground outside the broken pile. Support the broken pile with the backing plate on the ground outside to prevent the load-bearing frame 1 from becoming unstable due to uneven ground.

[0048] When there is a height difference on the ground outside the broken pile or when the height of the load-bearing frame 1 needs to be adjusted, it is overcome by adjusting the heights of the support columns 2 in different directions.

[0049] According to the cross-sectional size of the broken pile, adjust the position of the positioning pulley 5 on the positioning I-shaped steel frame 35 to ensure that when hoisting the water mill drill, the drilling position of the water mill drill is not less than 280 mm away from the edge of the broken pile, thereby ensuring the thickness of the retaining wall layer for pile shaft excavation. At the same time, the position of the counterweight 6 on the counterweight I-shaped steel frame 39 also needs to be adjusted to ensure the balance of both sides of the device.

[0050] The hoist works to lower the water mill drill rig onto the broken pile, and then the construction workers control the water mill drill rig for construction. After the core drilling is completed, the core is taken out using the existing calipers; the hoist works to lift the water mill drill rig, and the construction workers push the rotating handle to make the water mill drill rig rotate and move along with the hollow rotating shaft. After reaching the position, lower the water mill drill rig again to continue working; it should be noted that the drill holes are closely connected to ensure that they can form a ring, as Figure 4 shown;

[0051] After completing one circle of core drilling, replace the water mill drill rig with a skip bucket to lift out the core; then manually break the pile core of this layer and put the broken pile core into the skip bucket to lift it out and clean it up, as Figure 5 、 Figure 6 shown;

[0052] Repeat the steps of core drilling, lifting out the core, breaking the pile core, and cleaning the pile core concrete until reaching the broken pile. Then clean the concrete slag inside the broken pile, remove this device, and pour concrete to complete the treatment of the broken pile.

[0053] Although the specific implementation manners of the present invention are described above in conjunction with the drawings, it is not a limitation to the protection scope of the present invention. Those skilled in the art should understand that based on the technical solution of the present invention, various modifications or deformations that can be made by those skilled in the art without creative efforts are still within the protection scope of the present invention.

Claims

1. An auxiliary device for dealing with broken piles of reinforced concrete cast-in-place piles, characterized in that It includes a load-bearing frame arranged above the broken pile. The load-bearing frame is movably connected to multiple support columns and rotatably connected to a positioning frame, and the positioning frame can rotate relative to the load-bearing frame. A positioning pulley and a counterweight are movably connected to the positioning frame, and a winch is fixedly arranged on the load-bearing frame. A steel wire rope is arranged on the winch, and one end of the steel wire rope passes through the positioning pulley and then hoists a water mill drill or a skip bucket.

2. The auxiliary device for dealing with the broken pile of a reinforced concrete cast-in-place pile according to claim 1, characterized in that, The load-bearing frame includes a central frame, which is composed of a central disc and several support cross beams evenly distributed along the circumference of the central disc. A bushing hole is arranged at the center of the central disc, and a circular roller guide is also arranged on the central disc. A connecting flange is fixedly arranged at the end of the support cross beam far from the central disc.

3. The auxiliary device for dealing with the broken pile of a reinforced concrete cast-in-place pile according to claim 2, characterized in that, The load-bearing frame further includes a frame branch beam, and a connecting flange is also arranged at one end of the frame branch beam. A limiting plate is arranged at the other end of the frame branch beam. The frame branch beam is movably connected to the support column through a connecting ring. The inside of the connecting ring is hollow and can accommodate the frame branch beam. A limiting bolt hole is opened at the center of the top of the connecting ring and is threadedly connected to a limiting bolt.

4. The auxiliary device for dealing with the broken pile of a reinforced concrete cast-in-place pile according to claim 3, characterized in that, The support column consists of two parts, including a sleeve rod. A support rod is slidably connected inside the sleeve rod. Positioning holes are opened on the surface of the support rod. A pin is arranged at one end of the sleeve rod and can be inserted into the positioning hole. A backing plate is fixedly connected to the other end of the sleeve rod. The top of the support rod is fixedly connected to the connecting ring.

5. The auxiliary device for dealing with broken piles of a reinforced concrete cast-in-place pile according to claim 2, characterized in that, The positioning frame includes a hollow rotating shaft. A limiting circular flange is fixedly connected to the top of the hollow rotating shaft. At the bottom of the limiting circular flange, a plurality of rollers are evenly fixed along the same circumferential direction. The rollers rotate inside the circular roller guide. The hollow rotating shaft can pass through the bushing hole. A plumb bob is fixedly arranged at the center of the bottom end of the hollow rotating shaft. Symmetrical rotating handles are arranged at the bottom of the hollow rotating shaft.

6. The auxiliary device for dealing with the broken pile of a reinforced concrete cast-in-place pile as described in claim 5, characterized in that, A positioning I-shaped steel frame and a counterweight I-shaped steel frame are also fixedly connected to the hollow rotating shaft. A positioning pulley is movably connected to the positioning I-shaped steel frame, and a counterweight is movably connected to the counterweight I-shaped steel frame.

7. An auxiliary device for dealing with broken piles of reinforced concrete cast-in-place piles according to claim 5, characterized in that, A first fixed pulley is arranged at the top of the limiting circular flange; a second fixed pulley is arranged inside the hollow rotating shaft; a third fixed pulley is fixedly arranged at the bottom of one end of the positioning I-shaped steel frame close to the hollow rotating shaft; a steel wire rope hole is opened on the hollow rotating shaft.

8. The auxiliary device for dealing with broken piles of a reinforced concrete cast-in-place pile according to claim 6, wherein, The positioning pulley or the counterweight is connected to the positioning I-shaped steel frame or the counterweight I-shaped steel frame through a movable positioning mechanism; several groups of positioning pin holes are opened on the lower flange of the positioning I-shaped steel frame or the counterweight I-shaped steel frame. Each group of positioning pin holes includes two, and each group of positioning pin holes is symmetrically arranged relative to the web of the positioning I-shaped steel frame or the counterweight I-shaped steel frame. The groups of positioning pin holes are arranged at intervals, and the interval distance of each group is the same.

9. The auxiliary device for dealing with the broken pile of a reinforced concrete cast-in-place pile according to claim 8, wherein, The movable positioning mechanism includes a positioning frame that can wrap the lower flange. The positioning frame is symmetrically structured relative to the I-shaped steel web. A positioning spring pin is arranged at the top of the positioning frame. The pin head of the positioning spring pin can be inserted into the positioning pin hole.

10. An auxiliary device for dealing with broken piles of reinforced concrete cast-in-place piles according to claim 9, characterized in that, The positioning pulley includes a pulley main body. A pulley rotating shaft is fixedly arranged on the pulley main body. The pulley rotating shaft is rotatably connected to a pulley connecting rod; a counterweight connecting rod is arranged at the center of the counterweight. The pulley connecting rod or the counterweight connecting rod is fixedly connected to the bottom of the positioning frame.

Images