Clamp and pile extractor

Abstract

An embodiment of the present invention discloses a clamp. The first ends of the two upper jaw arms of the clamp are respectively rotatably installed on the lower jaw plate, and arc-shaped sliding grooves are respectively arranged at the second ends to penetrate and install the arm clamp drive pins. When the lower jaw plate and the two arm clamp drive pins move following the drive device, clamping and locking of the pile to be pulled out by the clamp are realized. The above clamp is installed on the frame of the pile puller of the present invention. During operation, the two upper jaw arms are driven to clamp the pile to be pulled out for pile pulling, and small pile bodies can be conveniently pulled out, and it has a high cost performance.

Description

Technical Field

[0001] The present invention relates to the technical field of power tools, and particularly to a clamp and a pile extractor, which are particularly suitable for small-scale projects such as garden construction. Background Art

[0002] For occasions such as garden construction, pile extraction operations are often required, that is, square or round piles placed in the soil layer are pulled out of the ground. When extracting a pile, generally a steel wire rope is used to tightly wrap around the pile body, and then the winch is started to wind up the steel wire rope to pull the pile body out of the soil layer. There is a problem that the locking operation of the steel wire rope is not convenient and reliable enough. There are also special clamps used for pile extraction. Its two clamping arms are opened or tightened under the drive of a transverse drive mechanism to clamp / release the pile body, and then the longitudinal drive mechanism is started to drive the clamp to lift and lower for pile extraction. Since the clamping and lifting actions of the clamp are respectively equipped with separate drive mechanisms, the equipment structure is complex and the manufacturing cost is relatively high. In view of the unsatisfactory cost performance of the existing clamp during pile extraction, it cannot be well applied to small-scale project use occasions such as garden construction. Therefore, it is necessary to design a new type of clamp and optimize the structure of the pile extractor on this basis to better meet the needs of market users. Summary of the Invention

[0003] Aiming at the defects existing in the prior art, the present invention provides a new type of clamp and pile extractor suitable for garden construction and the like.

[0004] To solve the above technical problems, the present invention adopts the following technical solutions:

[0005] The present invention provides a clamp, including a lower jaw plate and two upper jaw arm clamps arranged side by side. The first end of each upper jaw arm clamp is rotatably installed on the lower jaw plate respectively. The second end of each upper jaw arm clamp is respectively provided with an arc-shaped sliding groove. The arc top of each sliding groove faces the center line between the two upper jaw arm clamps respectively. And an arm clamp driving pin is respectively inserted into each sliding groove. The lower jaw plate and the two arm clamp driving pins are respectively connected to a driving device, wherein the driving device can move along the center line direction between the two upper jaw arm clamps.

[0006] Optionally, the two arm clamp driving pins are symmetrically arranged on both sides of the center line between the two upper jaw arm clamps; and / or, the clamping side of each upper jaw arm clamp is arc-shaped respectively; and / or, an arm clamp insert is respectively arranged in the middle of the clamping side of each upper jaw arm clamp.

[0007] Optionally, the driving device has a chain wound around a driving sprocket. A sliding plate is fixedly installed on the chain, and the sliding plate is fixedly installed with the lower jaw plate. The first end of each upper jaw arm clamp is respectively hinged to the lower jaw plate through a jaw plate pin.

[0008] Optionally, the base portion of the sliding plate is located inside the track groove of the main housing of the rack, and the sliding portion of the sliding plate is located in the track groove; the lower jaw plate is located outside the track groove, and the lower jaw plate is fixedly connected to the sliding portion of the sliding plate.

[0009] Optionally, the drive device is configured with a clutch. One end of the clutch pawl is hinged to the clutch housing through a pawl pin, and the ratchet surface at the second end of the clutch pawl is connectable / separable to the pin shaft of the chain link. Two arm clamp drive pins are respectively fixedly installed on the clutch housing.

[0010] Optionally, the clutch is configured with a sliding bar. Limiting plates are respectively arranged at both ends on one side of the sliding bar so that notches with notch slopes are respectively formed at the upper and lower ends of the middle part of the sliding bar. The sliding bar is movably installed in the clutch housing through the notches of the sliding bar; the upper end of the clutch pawl has a clutch pawl slope, and the notch slope at the upper end of the sliding bar is adapted to the clutch pawl slope so that when they contact, the clutch pawl can be driven to rotate forward to separate the clutch pawl from the link pin shaft; a clutch pawl slope is arranged on one side at the lower end of the clutch pawl, and the other side at the lower end of the clutch pawl is adapted to the notch slope of the sliding bar at the lower end so that when they abut, the clutch pawl is driven to rotate reversely to combine the clutch pawl with the link pin shaft. [[ID=⑧]]

[0011] Optionally, the top of the chain passes through the clutch housing and is suspended inside the main housing. The bottom of the chain is supported and tensioned by the chain bottom support shaft on the main housing. The sliding plate and the clutch housing are respectively installed in the track groove opened on one side wall of the main housing.

[0012] On this basis, the present invention further provides a pile extractor, which includes a rack, and the clamp described above is installed on the rack. During operation, the two upper jaw arm clamps are driven to clamp the pile to be extracted for pile extraction. [[ID=⑨]]

[0013] Optionally, a pile extraction auxiliary is configured. The pile extraction auxiliary is installed in the auxiliary accommodation cavity of the base of the pile extractor to assist in clamping the pile to be extracted with a height above the ground surface lower than a preset value.

[0014] Optionally, the pile extraction auxiliary includes a column, a cross beam and two bottom beams. The cross beam is arranged at the top of the column to be fixedly connected to the base, and the two bottom beams are arranged in a V shape at the bottom end of the column to assist in clamping the pile to be extracted.

[0015] Compared with the prior art, the two upper jaw arm clamps of the clamp of the present invention are provided with arc-shaped sliding grooves and arm clamp drive pins are installed therein. By driving the translation of the arm clamp drive pins, the rotation and translation of the upper jaw arm clamps are simultaneously realized, and finally the removal operation of the workpiece is realized. Since only one set of drive mechanism needs to be configured, it is beneficial to simplify the structure and save costs. Description of the Drawings

[0016] Figure 1Schematic diagram of a pile extractor structure installed with the clamp of the embodiment of the present invention;

[0017] Figure 2 is Figure 1 partial disassembly of the pile extractor shown Figure 1 ;

[0018] Figure 3 is Figure 1 partial disassembly of the pile extractor shown Figure 2 ;

[0019] Figure 4 is Figure 3 partial disassembly drawing of the clamp and clutch in

[0020] Figure 5 is Figure 3 schematic diagram of the assembled clamp and clutch in

[0021] Figure 6 is Figure 5 schematic diagram of the structure of the clamp shown

[0022] Figure 7 is Figure 5 front view of the clutch shown

[0023] Figure 8 is Figure 5 rear view of the clutch shown

[0024] Figure 9 is Figure 5 left view of the clutch shown

[0025] Figure 10 is Figure 5 right view of the clutch shown

[0026] Figure 11 is Figure 5 top view of the clutch shown

[0027] Figure 12 is Figure 5 bottom view of the clutch shown

[0028] Figure 13 is Figure 9 G-G sectional view of

[0029] Figure 14 is Figure 1 schematic diagram of the pile extractor preparing to extract a pile shown

[0030] Figure 15 is Figure 14 enlarged view of part I in

[0031] Figure 16 is Figure 1Schematic diagram of the pile extraction process of the shown pile extractor;

[0032] Figure 17 is Figure 16 Enlarged view of part II in;

[0033] Figure 18 is Figure 1 Schematic diagram of the pile extraction of the shown pile extractor when the pile surface is exposed relatively high above the ground;

[0034] Figure 19 is Figure 1 Schematic diagram of the pile extraction of the shown pile extractor when the pile surface is exposed relatively low above the ground;

[0035] Figure 20 is Figure 19 Schematic diagram of the pile extractor when pile extraction accessories are added when the pile surface is exposed relatively low above the ground.

[0036] Above Figures 1 - 20 Among them, the relevant reference signs are as follows:

[0037] 1. Engine; 2. Driven plate; 3. Hole snap ring (Φ42); 4. Bearing (6004-2RS); 5. Shaft snap ring (Φ20); 6. Driven plate housing; 7. Socket head cap screw (M6X30); 8. Socket head cap screw (M8X25); 9. Reduction gearbox; 10. Driving sprocket; 11. Hole snap ring (Φ110); 12. Bearing (6014-2RS); 13. Shaft snap ring (Φ70); 14. Sprocket housing; 15. Extractor handle; 16. Socket head cap screw (M8X16); 17. Slide bar limit block; 18. Socket head cap screw (M8X16); 19. Main housing; 20. Blind cover; 21. Engine throttle handle; 22. Engine protection frame; 23. Socket head cap screw (M10X20); 24. Chain; 25. Cover 1; 26. Cross recessed pan head screw (M6X7); 27. Clutch pawl; 28. Clutch housing, 281. Arm clamp drive pin, 282. Clutch housing plate 1, 283. Clutch housing plate 2, 284. Clutch housing plate 3, 285. Clutch housing plate 4, 286. Chain guide plate, 287. Reinforcing rib; 29. Pawl pin; 30. Shaft snap ring (Φ16); 31. Upper jaw arm clamp 1, 311. Slide groove, 312. Arm clamp insert; 32. Upper jaw arm clamp 2, 321. Slide groove, 322. Arm clamp insert; 33. Countersunk head socket screw (M8X12); 34. Lower jaw plate; 35. Slide plate, 351. Base part, 352. Slide part; 36. Jaw pin; 37. Slide bar, 371. Slide bar notch, 372. Notch slope, 373. Notch slope; 38. Chain bottom support shaft; 39. Base; 40. Hexagon flange lock nut (M12); 41. Rubber wheel; 42. Rubber wheel mounting shaft; 43. Socket head cap screw (M6X7); 44. Cover 2; 45. Auxiliary extraction part, 451a. Bottom beam 1, 451b. Bottom beam 2, 452. Column, 453. Cross beam, 454. Auxiliary part fixing piece; 100. Pile body; L. Clutch; J. Clamp; Q. Driving device. Detailed implementation mode

[0038] The following is a detailed description in combination with the attached drawings and specific embodiments. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0039] The clamp of the present invention can be applicable to occasions such as pulling out pile bodies in garden engineering, and of course can also be used in other similar application scenarios. The following takes the extractor as an example for a detailed description.

[0040] See also Figures 1 - 20, which shows a schematic structural diagram of a preferred embodiment of a pile puller according to the present invention. This pile puller is a lightweight device for extracting square or round piles from soil. It primarily comprises a frame, chain 24, clutch L, clamp J, and drive unit Q. It utilizes a chain clutch to drive and lock the clamp arm, automatically locking the pile 100 during extraction, facilitating quick and safe pile extraction. This is further described below.

[0041] like Figures 1 - 4 As shown, the machine frame is in the form of a column, with a hollow main housing 19, into which components such as the clutch and chain 24 can be mounted. A slot is provided on one side wall of the main housing 19 to allow passage of the clamp's slide plate and connecting pins. A pile puller handle 15 is fixedly mounted on the top of the main housing 19 for support during pile pulling operations. A base 39 is fixedly mounted on the bottom of the main housing 19 to stabilize the main housing 19 on the ground during pile pulling operations. Rollers are located at the bottom of the main housing 19 for movement, specifically a pair of rubber wheels 41, which facilitate movement of the pile puller.

[0042] In this embodiment, a drive unit Q is mounted on top of the pile puller. It primarily consists of an engine 1, a reduction gearbox 9, and a drive sprocket 10. The sprocket housing 14 of the drive sprocket 10 is fixedly mounted on the top of the main housing 19. The main shaft of the drive sprocket 10 is connected to the engine 1 via the reduction gearbox 9, allowing the drive sprocket 10 to output power. A chain 24 is mounted on the drive sprocket 10 at one end. The other end of the chain 24 passes through a clutch housing 28 and is suspended and tensioned within the main housing 19. The clutch housing 28 is slidably mounted within the main housing. Starting the engine 1 causes the drive sprocket 10 to rotate, driving the chain 24. Furthermore, an engine protection frame 22 is fixedly mounted on the top of the main housing 19. This frame supports the engine 1 to prevent it from falling. The engine also features an engine throttle handle 21 for easy control of the engine 1.

[0043] In this embodiment, the chain 24, clutch L, and clamp J can be installed in the following structure. The top of the chain 24 is mounted on the drive sprocket 10 and suspended in the main housing 19 of the frame. The bottom of the chain 24 is supported and tensioned by the chain bottom support shaft 38 on the main housing 19. The clutch L is slidably mounted on the main housing 19 and can be clutched and connected to the chain 24 so as to follow the movement of the chain 24. The clamp J is slidably mounted on the main housing 19 and can be limitedly slidably connected to the clutch L to drive the arm of the clamp J to rotate and lock it when clamping the pile. In this way, by using the chain clutch to drive and lock the arm of the clamp, the pile body can be automatically locked when pulling the pile, thereby allowing for quick and reliable pile pulling operations.

[0044] In the embodiment of the present invention, the pile extractor optimizes the clamp structure and is equipped with a clutch, making the pile extraction operation more convenient and reliable, which will be further described below.

[0045] As Figures 5 - 6 shown, and also referring to Figures 1 - 4 , the clamp J specifically includes a lower jaw plate 34 and a pair of upper jaw arm clamps, namely upper jaw arm clamp one 31 and upper jaw arm clamp two 32, which are arranged side by side. The lower jaw plate 34 is slidably installed on the main housing 19, and the bottom ends of the two upper jaw arm clamps are rotatably installed on the lower jaw plate 34 respectively, and the upper ends of the two upper jaw arm clamps are connected to the driving device Q in a limited sliding manner. Specifically, in this embodiment, arc-shaped sliding grooves are respectively provided at the second ends (i.e., the tops) of the upper jaw arm clamp one 31 and the upper jaw arm clamp two 32. The arc tops of each sliding groove face the center line between the two upper jaw arm clamps, and an arm clamp driving pin 281 is inserted into each sliding groove. The lower jaw plate 34 and the two arm clamp driving pins 281 are respectively connected to the driving device Q, and the driving device Q can move along the center line direction between the two upper jaw arm clamps, specifically, it can slide up and down along the main housing 19. In this way, by providing arc-shaped sliding grooves on the two upper jaw arm clamps and inserting arm clamp driving pins 281 therein, the rotation and translation of the upper jaw arm clamps are simultaneously realized by driving the translation of the arm clamp driving pins, and finally the removal operation of the workpiece can be realized. Since only one set of driving mechanism needs to be configured, it is beneficial to simplify the structure and save costs.

[0046] As Figure 6 shown, arc-shaped sliding grooves 311 and 321 are respectively provided at the upper ends of the two upper jaw arm clamps, which can be through grooves or counterbores. Their arc tops face the center line between the two upper jaw arm clamps, and the two arm clamp driving pins 281 are symmetrically arranged on both sides of the center line between the two upper jaw arm clamps. Further, the clamping sides of the two upper jaw arm clamps are generally arc-shaped (specifically, it can be a standard arc or a non-standard arc-like shape). The clamping parts of the two upper jaw arm clamps are located in the middle of the clamping sides, and the clamping parts are further provided with arm clamp inserts adapted to the outer shape of the pile body 100 to be clamped. In this way, the arm clamp inserts 312 and 322 can be replaced according to the specifications and shapes of the pile bodies, which is convenient for reliably clamping the pile body 100.

[0047] The driving device Q in this embodiment has a chain 24 wound around a driving sprocket, and the pile pulling stroke is relatively long compared to the oil cylinder. To ensure smooth sliding of the clamp, the clamp J is provided with a sliding plate 35, which has a base portion 351 and a sliding portion 352. The sliding portion 352 is strip-shaped and located at the middle position on one side of the base portion 351. The sliding plate is fixedly installed on the chain 24, where the base portion 351 of the sliding plate 35 is located inside the track groove of the main housing 19, and the sliding portion 352 is located in the track groove; the lower jaw plate 34 is located outside the track groove, and the lower jaw plate 34 and the sliding plate 35 are fixed together by socket head cap screws 33. In this way, the lower jaw plate 34 and the sliding plate 35 are respectively clamped on the inner and outer sides of the track groove, and are guided by the sliding portion 351 of the sliding plate 35 in the track groove to ensure smooth up and down sliding of the lower jaw plate 34. The lower ends of the two upper jaw arm clamps are hinged to the lower jaw plate 34 through arm clamp pins 36, so as to ensure flexible rotation of the two upper jaw arm clamps.

[0048] The driving device Q in this embodiment is provided with a clutch L, which includes a clutch housing 28 and a clutch pawl 27. The clutch pawl 27 is hinged to the clutch housing 28 through a pawl pin 29. Specifically, the first end of the clutch pawl 27 is hinged to the clutch housing 28 through a pawl pin, and the second end ratchet surface of the clutch pawl 27 is connectable / separable to the chain link pin shaft, thereby realizing the engagement and disengagement with the chain 24. An arm clamp driving pin 281 is provided on the clutch housing 28 of the clutch L, and the arm clamp driving pin 281 is installed through the sliding grooves 311 and 321, so that the two upper jaw arm clamps can slide correspondingly on the clutch housing 28 and be limited. In this way, by connecting the power through the clutch L, the two upper jaw arm clamps can be automatically locked when rotating to the pile clamping position. The structure of the clutch will be further described in detail below with reference to the relevant drawings.

[0049] As Figures 7 - 13 shown, and also refer to Figures 1 - 6, the above clutch housing 28 is an assembly. The clutch housing 28 includes components such as a first clutch housing plate 282, a second clutch housing plate 283, a third clutch housing plate 284, a fourth clutch housing plate 285, a chain guide plate 286, and a reinforcing rib 287. The first clutch housing plate 282, the second clutch housing plate 283, and the third clutch housing plate 284 are arranged in parallel. The fourth clutch housing plate 285 and the chain guide plate 286 are respectively arranged perpendicular to the second clutch housing plate 283 and the third clutch housing plate 284. The fourth clutch housing plate 285 and the chain guide plate 286 can be welded to the second clutch housing plate 283 and the third clutch housing plate 284. The first clutch housing plate 282 can be screwed to the second clutch housing plate 283 and the third clutch housing plate 284. A reinforcing rib 287 can also be welded between the second clutch housing plate 283 and the third clutch housing plate 284 to increase strength. The formed special-shaped clutch housing 28 can be installed with components such as an arm clamp drive pin 281, a clutch pawl 27, and a sliding bar 37, which are further described as follows.

[0050] In this embodiment, two arm clamp drive pins 281 are installed on the first clutch housing plate 282. They are horizontally arranged and are installed through the sliding grooves 311 and 321. When the clutch housing 28 slides, the two arm clamp drive pins 281 cause the two upper jaw arm clamps to slide on the clutch housing 28 along the sliding grooves 311 and 321 correspondingly. When the clutch housing 28 is limited and stops, the two upper jaw arm clamps tightly clamp the pile body 100 for pile pulling operation.

[0051] In this embodiment, the clutch pawl 27 is clamped between the second clutch housing plate 283 and the third clutch housing plate 284 and is rotatably connected to both of them. The clutch pawl 27 has a ratchet surface adapted to the link pin of the chain 24. By buckling the link pin of the chain 24 through this ratchet surface, the combination of the clutch L and the chain 24 can be realized, and thus the power of the driving device can be connected.

[0052] In this embodiment, the clutch is further configured with a sliding bar 37. Limiting plates are respectively arranged at both ends of one side of the sliding bar 37, so that a sliding bar notch 371 is formed in the middle of the sliding bar. The sliding bar 37 is movably installed in the clutch housing 28 through the sliding bar notch 371, and at the same time, it can prevent the sliding bar 37 from disengaging from the clutch housing 28. Here, the upper and lower ends of the sliding bar notch 372 respectively have sliding bar notch inclined surfaces 372 and 373, and the upper end of the clutch pawl 27 has a clutch pawl inclined surface. The upper sliding bar notch inclined surface 372 is adapted to the clutch pawl inclined surface, so that when the two are in contact, the clutch pawl 27 is driven to rotate forward, and the ratchet surface of the clutch pawl 27 is disengaged from the link pin shaft of the chain 24; on one side of the lower end of the clutch pawl 27, there is a clutch ratchet surface, and the other side of the lower end of the clutch pawl 27 is adapted to the lower sliding bar notch inclined surface 373, so that when the two are in contact, the clutch pawl 27 is driven to rotate reversely. Thus, the ratchet surface at the lower end of the clutch pawl 27 is buckled to the link pin shaft of the chain 24. Here, the sliding bar 37 is configured with a sliding bar limit block 17, and the sliding bar limit block 17 is fixedly installed at the top of the main housing 19 to limit the upward stroke of the sliding bar 37.

[0053] In this embodiment, the clutch housing 28 can slide up and down along the main housing 19 of the frame. Specifically, the clutch housing plate two 283 is slidably installed in the track groove of the main housing 19, and the housing plate one 282 and the clutch housing plate three 284 are respectively located inside and outside the track groove; at the same time, the chain 24 is passed through the clutch housing 19 and is suspended and installed in the main housing 19, so as to ensure the smooth sliding of the clutch housing 28.

[0054] The clamp in this embodiment is configured with a clutch to selectively access the power of the driving device, and the upper jaw arm clamp one 31 and the upper jaw arm clamp two 32 of the clamp can slide on the clutch housing 28 correspondingly and be limited. When the two upper jaw arms rotate to the pile clamping position, they can be automatically locked, thereby realizing fast and reliable pile pulling operation. This clutch structure realizes power access and clamp locking at the same time, simplifies the product structure, has a lower equipment price, and has higher market competitiveness.

[0055] The portable pile pulling product adopting the above clamp and clutch structure is convenient and reliable to operate. The assembly and use process of the pile puller product are described as follows.

[0056] Please refer to Figures 1 - 3 , the assembly process of the pile puller of the present invention is as described below:

[0057] (1) Install the bearing 4 in the driven disk housing 6 and fix it with a circlip for hole 3. Install the driven disk 2 in the bearing 4 and fix it with a circlip for shaft 5. Install and fix the engine 1 on the driven disk housing 6 and fix it with four socket head cap screws 7; Install the bearing 12 in the sprocket housing 14 and fix it with a circlip for hole 11. Install the drive sprocket 10 in the bearing 12 and fix it with a circlip for shaft 13. Install the driven disk housing 6 on the reduction gearbox 9 and fix it with four socket head cap screws 8. Install and fix the reduction gearbox 9 on the sprocket housing 14 and fix it on the sprocket housing 14 with four socket head cap screws 8.

[0058] (2) Install the slide bar stop 17 on the main housing 19 and fix it with two socket head cap screws 18. Install the puller handle 15 on the main housing 19 and fix it with four socket head cap screws 16.

[0059] (3) Install the blind cover 20 and the engine throttle handle 21 at the corresponding positions on the engine guard 22. Install the engine guard 22 on the main housing 19 and fix it with two socket head cap screws 23.

[0060] (4) Install the clutch pawl 27 in the clutch housing 28 and fix it with a pawl pin 29 to ensure its flexible rotation. In addition, install the slide bar 37 in the clutch housing 28 to make it move up and down flexibly.

[0061] (5) Install and fix the slide plate 35 on the chain 24 and fix it with two countersunk head socket screws 33. Install the upper jaw arm clamp one 31 and the upper jaw arm clamp two 32 on the lower jaw plate 34 through two jaw plate pins 36 and fix the jaw plate pins 36 with two circlips for shaft 30.

[0062] (6) Unfasten the chain 24 and pass it through the clutch housing 28, then restore its buckle. Install the chain 24 and its components in the main housing 19, and install the clutch housing 28, the lower jaw plate 34, and the slide plate 35 assembly on the track groove of the main housing 19. And install the chain 24 on the sprocket 10.

[0063] (7) Install the base 39 at the corresponding position on the main housing 19 and fix it with a chain bottom support shaft 38 and a hex flange lock nut 40. Install two rubber wheels 41 on the main housing 19 through a rubber wheel mounting shaft 42.

[0064] (8) Install and fix the cover one 25 on the main housing 19 through two cross recessed pan head screws 26. Fix the cover two 44 on the main housing 19 through two socket head cap screws 43.

[0065] (9)When necessary, further install the pile pulling accessory 45 in the accessory accommodating cavity of the base of the pile puller. The pile pulling accessory can be used to assist in clamping the pile 100 to be pulled out whose height above the ground surface is lower than a preset value. The pile pulling accessory is composed of components such as a column 452, a cross beam 453, and two bottom beams 451a and 451b. During assembly, the cross beam 453 is arranged at the top of the column 451 and fixedly connected to the base of the frame through an accessory fixing member 454. The two bottom beams 451a and 451 are arranged in a V shape at the bottom end of the column 451 to assist in clamping the pile to be pulled out, and the assembly is relatively easy. Thus, the overall assembly of the pile puller is finally completed.

[0066] In the above assembly process, a large number of screws, snap rings, etc. are used. It can be understood that other parts can also be used to achieve the connection between components. Of course, the connection of the main components of the present invention is not limited to the above-mentioned threaded connection, snap pin connection, etc., and will not be elaborated here.

[0067] See Figures 13 - 20 As shown, the pile puller of the present invention is relatively convenient and reliable to use, and its basic working principle and working process are as follows.

[0068] Preparing for pile pulling: As Figures 14 - 15 shown, make the lower end side of the clutch pawl 27 contact the lower inclined surface of the sliding bar notch at point A, and then make the chain 24 contact the other side of the lower end of the clutch pawl 27 at point B. Thus, the ratchet surface of the pawl pin 27 is engaged with the link pin shaft in the 24-chain. By controlling the engine throttle handle 21, the power is transmitted from the engine 1 to the gearbox 9, and after speed change, it is transmitted to the chain 24 through the drive sprocket 10 to make it rotate (direction is R). Since the clutch pawl 27 is buckled on the chain 24, when the chain 24 moves upward, it will inevitably drive the clutch housing 28 to move together. Since the upper jaw arm clamp two 32 is connected to the housing pin 281 on the clutch housing 28 through the sliding groove 321 (the same applies to the upper jaw arm clamp one 31). The upper jaw arm clamp two 32 and the upper jaw arm clamp one 31 are connected together by the lower jaw plate 34 to form an associated body. Thus, when the lower jaw plate 34 moves up and down driven by the sliding plate 35, it will inevitably drive the upper jaw arm clamp two 32 and the upper jaw arm clamp one 31 to move horizontally together. Since the housing pin 281 is in the arc-shaped sliding grooves of the upper jaw arm clamp one 31 and the upper jaw arm clamp two 32, when the clutch housing 28 moves, the upper jaw arm clamp one 31 and the upper jaw arm clamp two 32 will also rotate. Thus, the two will generate a clamping force towards each other through their own sliding grooves, and tightly clamp the pile body 100 to be pulled out through the arm clamp inserts of the upper jaw arm clamp one 31 and the upper jaw arm clamp two 32.

[0069] Pile pulling operation: As Figures 16 - 17As shown, it can be seen that the slider 37 rises with the clutch housing 28 and contacts the slider stop 17 at point D. Since the slider 37 can no longer move, the clutch housing 28 and the clutch pawl 27 continue to move upward. The inclined surface of the clutch pawl 27 contacts the inclined surface of the slider 37 at point E. At this time, the clutch pawl 27 rotates around the pawl pin 29, and the clutch pawl 27 disengages from the chain 24. The clutch housing 28 loses the upward pulling force. Due to its own weight, it begins to automatically descend. At the same time, the clamping force of the upper jaw arm clamp one 31 and the upper jaw arm clamp two 32 disappears, and it descends to the bottom together with the lower jaw plate 34. Return to the position before pile extraction and continue the next pile extraction process. According to whether the pile is pulled out according to its length, control whether to continue pile extraction through the throttle handle. When the pile is pulled out and lifted, such as Figure 6 、 Figure 7 position, the power can also be interrupted by controlling the throttle handle, and due to its own weight, the clutch housing 28, the upper jaw arm clamp one 31, the upper jaw arm clamp two 32, and the lower jaw plate 34 automatically descend. At the same time, the clamping force of the upper jaw arm clamp one 31 and the upper jaw arm clamp two 32 disappears and descends to the bottom. Return to the position before pile extraction and continue the next pile extraction process.

[0070] It should be noted that whether to install the pile extraction auxiliary part 45 can be determined by the height of the pile to be extracted 100 exposed above the ground, which is described in detail as follows.

[0071] Such as Figure 18 shown, when the height H0 of the pile body exposed above the ground is relatively high, that is, the height H2 of the top of the pile body is greater than the set height H1, there is no need to install the pile extraction auxiliary part 45, and the pile to be extracted 100 can be pulled out.

[0072] Such as Figures 19 - 20 shown, if the height H0 of the pile body exposed above the ground is relatively low, the pile extraction auxiliary part 45 can be installed. At this time, the pile extraction auxiliary part 45 is installed in the auxiliary part accommodation cavity of the pile extractor base and can be used to assist in clamping the pile to be extracted 100 with a height lower than the preset value exposed on the ground surface.

[0073] During the above pile extraction process, the arm clamps of the clamp are driven and locked by the chain clutch. The pile body can be automatically locked during pile extraction, so the operation is convenient and reliable. Moreover, the chain drive can increase the pile stroke and also help to reduce the equipment price, which makes the embodiments of the present invention have a good market prospect.

[0074] It should be noted that the above embodiments all use the pile to be extracted 100 as the workpiece to illustrate the structure, principle and working process of the clamp and its locking mechanism. It can be understood that the clamp and its locking mechanism can also be used in other similar occasions. When in use, just clamp the corresponding workpiece to perform the operation, which will not be elaborated here.

[0075] The above are only the preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be construed as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. For those of ordinary skill in the art, several improvements and modifications can be made without departing from the spirit and scope of the present invention, and these improvements and modifications should also be regarded as within the protection scope of the present invention.

Claims

1. A clamp, characterized in that, It includes a lower jaw plate and two upper jaw arm clamps arranged side by side. The first end of each upper jaw arm clamp is rotatably installed on the lower jaw plate respectively. The second end of each upper jaw arm clamp is provided with an arc-shaped sliding groove respectively. The arc top of each sliding groove faces the center line between the two upper jaw arm clamps respectively. And a clamp driving pin is inserted into each sliding groove respectively. The lower jaw plate and the two clamp driving pins are respectively connected to a driving device configured at the top of the pile extractor. Wherein the driving device can move along the direction of the center line between the two upper jaw arm clamps; The driving device is configured with a clutch. The first end of the clutch pawl is hinged to the clutch housing through a pawl pin. The second end ratchet surface of the clutch pawl can be combined / separated with the chain link pin shaft. The two clamp driving pins are respectively fixedly installed on the clutch housing.

2. The clamp according to claim 1, characterized in that, The two clamp driving pins are symmetrically arranged on both sides of the center line between the two upper jaw arm clamps; And / or, the clamping side of each upper jaw arm clamp is arc-shaped respectively; And / or, arm clamp inserts are respectively arranged in the middle of the clamping side of each upper jaw arm clamp.

3. The clamp according to claim 1, characterized in that, The driving device has a chain wound around a driving sprocket. A sliding plate is fixedly installed on the chain. The sliding plate is fixedly installed with the lower jaw plate. The first end of each upper jaw arm clamp is hinged to the lower jaw plate through a jaw plate pin respectively.

4. The clamp according to claim 3, wherein The base part of the sliding plate is located inside the track groove of the main housing of the frame. The sliding part of the sliding plate is located in the track groove; The lower jaw plate is located outside the track groove. And the lower jaw plate is fixedly connected to the sliding part of the sliding plate.

5. The clamp according to claim 4, characterized in that, The clutch is configured with a sliding bar. Limit plates are respectively arranged at both ends of one side of the sliding bar so that notch slopes are respectively formed at the upper and lower ends of the middle part of the sliding bar to form a sliding bar notch. The sliding bar is movably installed in the clutch housing through the sliding bar notch; The upper end of the clutch pawl has a clutch pawl slope. The upper end notch slope of the sliding bar is adapted to the clutch pawl slope so that when they contact, the clutch pawl can be driven to rotate forward to separate the clutch pawl from the link pin shaft; A clutch pawl slope is arranged on one side of the lower end of the clutch pawl. The other side of the lower end of the clutch pawl is adapted to the notch slope of the lower end of the sliding bar so that when they abut, the clutch pawl is driven to rotate reversely to combine the clutch pawl with the link pin shaft.

6. The clamp according to any one of claims 3-5, characterized in that, The top of the chain passes through the clutch housing and is suspended inside the main housing. The bottom of the chain is supported and tensioned by a chain bottom support shaft on the main housing. The sliding plate and the clutch housing are respectively installed in a track groove opened on a side wall of the main housing.

7. A pile extractor, comprising a frame, characterized in that, A clamp as described in any one of claims 1-6 is installed on the frame. During operation, the two upper jaw arm clamps are driven to clamp the pile to be extracted for pile extraction.

8. The pile extractor according to claim 7, characterized in that, A pile extraction auxiliary is configured. The pile extraction auxiliary is installed in an auxiliary accommodation cavity of the base of the pile extractor to assist in clamping the pile to be extracted whose height exposed above the ground is lower than a preset value.

9. The pile extractor according to claim 8, characterized in that, The pile extraction auxiliary includes a column, a cross beam and two bottom beams. The cross beam is arranged at the top of the column to be fixedly connected to the base. The two bottom beams are arranged in a V shape at the bottom end of the column to assist in clamping the pile to be extracted.

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