CN111139826A

CN111139826A - Clamp and pile extractor

Info

Publication number: CN111139826A
Application number: CN202010031760.4A
Authority: CN
Inventors: 金良盛; 陈奇君; 张文斌
Original assignee: Hangzhou Sharp Garden Machinery Co ltd
Current assignee: Hangzhou Sharp Garden Machinery Co ltd
Priority date: 2020-01-13
Filing date: 2020-01-13
Publication date: 2020-05-12

Abstract

The embodiment of the invention discloses a clamp, wherein first ends of two upper jaw arm clamps of the clamp are respectively and rotatably arranged on a lower jaw plate, second ends of the two upper jaw arm clamps are respectively provided with an arc-shaped sliding groove for penetrating and installing arm clamp driving pins, and when the lower jaw plate and the two arm clamp driving pins move along with a driving device, the clamp can clamp and lock a pile body to be pulled. The clamp is arranged on the pile extractor frame, and the two upper jaw arm clamps are driven to clamp the pile to be extracted for pile extraction during operation, so that a small pile body can be conveniently extracted, and the cost performance is high.

Description

Clamp and pile extractor

Technical Field

The invention relates to the technical field of power tools, in particular to a clamp and a pile extractor, which are particularly suitable for small-sized engineering application such as garden construction.

Background

In the occasions of garden construction and the like, pile pulling operation is often needed, namely square or round piles placed on a soil layer are pulled out of the ground. When the pile is pulled out, the pile body is generally tightly sleeved by a steel wire rope, then a winch is started to wind the steel wire rope so as to pull out the pile body from a soil layer, and the problem that the steel wire rope locking operation is not convenient and reliable enough exists. The pile pulling method is characterized in that a special clamp is also adopted for pile pulling, two clamping arms of the special clamp are driven by a transverse driving mechanism to be opened or tightened to clamp/release a pile body, then a longitudinal driving mechanism is started to drive the clamp to lift so as to pull the pile body, and the clamping and lifting actions of the clamp are respectively and independently provided with the driving mechanisms, so that the equipment structure is complex, and the manufacturing cost is high. In view of the fact that the existing clamp is unsatisfactory in cost performance during pile pulling, the clamp cannot be well applied to small-sized engineering use occasions such as garden construction and the like. Therefore, a novel clamp is needed to be designed, and the structure of the pile extractor is optimized on the basis, so that the requirements of market users can be better met.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a novel clamp and a pile extractor which are suitable for garden construction and the like.

In order to solve the technical problems, the invention adopts the following technical scheme:

the invention provides a clamp, which comprises a lower jaw plate and two upper jaw arm clamps arranged side by side, wherein a first end of each upper jaw arm clamp is rotatably arranged on the lower jaw plate, a second end of each upper jaw arm clamp is provided with an arc-shaped sliding groove, an arc top of each sliding groove faces to a central line between the two upper jaw arm clamps, an arm clamp driving pin is arranged in each sliding groove in a penetrating manner, the lower jaw plate and the two arm clamp driving pins are connected to a driving device respectively, and the driving device can move along the direction of the central line between the two upper jaw arm clamps.

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

Alternatively, the drive means has a chain wound around a drive sprocket, wherein the chain is fixedly mounted with a slide plate fixedly mounted with the lower jaw plate, and the first end of each upper jaw arm clamp is hinged to the lower jaw plate by a jaw plate pin.

Optionally, the base portion of the sliding plate is located inside the rail groove of the main housing of the frame, and the sliding portion of the sliding plate is located in the rail groove; the lower jaw plate is positioned at the outer side of the track groove and is fixedly connected with the sliding part of the sliding plate.

Alternatively, the drive device is provided with a clutch, wherein a first end of the clutch pawl is hinged to the clutch housing by a pawl pin, a second end ratchet surface of the clutch pawl is connected with the chain link pin shaft in an engageable/disengageable manner, and the two arm clamp drive pins are respectively fixedly mounted to the clutch housing.

Optionally, the clutch is provided with a sliding strip, two ends of one side of the sliding strip are respectively provided with a limiting plate so that the upper end and the lower end of the middle part of the sliding strip are respectively provided with a sliding strip notch with a notch inclined plane, and the sliding strip is movably arranged in the clutch shell through the sliding strip notch; the upper end of the clutch pawl is provided with a clutch pawl inclined plane, and the opening inclined plane at the upper end of the sliding strip is matched with the clutch pawl inclined plane so as to drive the clutch pawl to rotate positively when the clutch pawl and the clutch pawl are in contact with each other, so that the clutch pawl is separated from the chain link pin shaft; one side of the lower end of the clutch pawl is provided with a clutch pawl inclined plane, and the other side of the lower end of the clutch pawl is matched with the sliding strip notch inclined plane at the lower end, so that the clutch pawl is driven to rotate reversely when the clutch pawl and the sliding strip notch inclined plane are abutted against each other, and the clutch pawl is combined with the chain link pin shaft.

Optionally, the top of the chain is inserted through the clutch housing and suspended in the main housing, the bottom of the chain is supported and tensioned by a support shaft at the bottom of the chain on the main housing, and the sliding plate and the clutch housing are respectively mounted on a track groove formed in one side wall of the main housing.

On the basis, the invention also provides a pile extractor which comprises a rack, wherein the clamp is arranged on the rack, and the two upper jaw arm clamps are driven to clamp a pile to be extracted for pile extraction during operation.

Optionally, a pile pulling auxiliary is configured, and the pile pulling auxiliary is installed in an auxiliary accommodating cavity of the pile pulling machine base and used for assisting in clamping the pile to be pulled, of which the exposed ground surface height is lower than a preset value.

Optionally, the pile pulling auxiliary comprises a stand column, a cross beam and two bottom beams, the cross beam is arranged at the top end of the stand column and fixedly connected with the base, and the two bottom beams are arranged at the bottom end of the stand column in a splayed manner to assist clamping of the pile to be pulled.

Compared with the prior art, the two upper jaw arm clamps of the clamp are provided with the arc-shaped sliding grooves, the arm clamp driving pins are arranged in the arc-shaped sliding grooves, the upper jaw arm clamps rotate and translate simultaneously through the translation of the driving arm clamp driving pins, and finally the workpiece is pulled out.

Drawings

FIG. 1 is a schematic structural view of a pile extractor with clamps according to an embodiment of the invention;

FIG. 2 is a partially exploded view of the pile extractor of FIG. 1;

FIG. 3 is a partially exploded view of the pile extractor of FIG. 1;

FIG. 4 is a partially exploded view of the clamp and clutch of FIG. 3;

FIG. 5 is a schematic view of the caliper and clutch assembly of FIG. 3;

FIG. 6 is a schematic view of the structure of the pliers shown in FIG. 5;

FIG. 7 is a front view of the clutch of FIG. 5;

FIG. 8 is a rear elevational view of the clutch illustrated in FIG. 5;

FIG. 9 is a left side elevational view of the clutch illustrated in FIG. 5;

FIG. 10 is a right side elevational view of the clutch illustrated in FIG. 5;

FIG. 11 is a top plan view of the clutch of FIG. 5;

FIG. 12 is a bottom view of the clutch of FIG. 5;

FIG. 13 is a sectional view taken along line G-G of FIG. 9;

FIG. 14 is a schematic view of the pile extractor of FIG. 1 in preparation for pile extraction;

FIG. 15 is an enlarged view of portion I of FIG. 14;

fig. 16 is a schematic view of a pile extracting process of the pile extractor shown in fig. 1;

FIG. 17 is an enlarged view of portion II of FIG. 16;

fig. 18 is a schematic view of pile pulling of the pile driver shown in fig. 1 when the pile surface is exposed out of the ground and is high;

fig. 19 is a schematic view of pile extractor of the pile extractor of fig. 1 when the pile surface is exposed to the ground and is low;

fig. 20 is a schematic view of the pile extractor of fig. 19 with pile extraction auxiliary elements added when the pile surface is exposed to the ground and is low.

In the above fig. 1-20, the relevant reference numerals are as follows:

1. an engine; 2. a driven disc; 3. circlip for hole (phi 42); 4. a bearing (6004-2 RS); 5. a circlip for shaft (Φ 20); 6. a driven disk housing; 7. a socket head cap screw (M6X 30); 8. a socket head cap screw (M8X 25); 9. a reduction gearbox; 10. a drive sprocket; 11. circlip for hole (phi 110); 12. A bearing (6014-2 RS); 13. a circlip for shaft (phi 70); 14. a sprocket housing; 15. a handle of the pile extractor; 16. socket head cap screws (M8X 16); 17. a slide bar stopper; 18. socket head cap screws (M8X 16); 19. a main housing; 20. covering the blank with a cover; 21. an engine throttle handle; 22. an engine fender bracket; 23. a socket head cap screw (M10X 20); 24. a chain; 25. covering a first cover; 26. spider head screws (M6X 7); 27. A clutch pawl; 28. the chain guide plate comprises a clutch shell 281, arm clamp driving pins 282, a clutch shell plate I, a clutch shell plate 283, a clutch shell plate II, a clutch shell plate 284, a clutch shell plate III, a clutch shell plate 285, a clutch shell plate IV, a clutch shell plate 286, a chain guide plate 287 and a reinforcing rib; 29. a pawl pin; 30. a circlip for shaft (phi 16); 31. the upper jaw arm clamp I311, the sliding groove 312 and the arm clamp insert; 32. a second upper jaw arm clamp 321, a sliding groove 322 and an arm clamp insert; 33. hexagon socket countersunk head screws (M8X 12); 34. a lower jaw plate; 35. a slide plate 351 and a base portion; 352. a sliding part; 36. a jaw plate pin; 37. a sliding strip 371, a sliding strip gap; 372. notch inclined plane 373, notch inclined plane; 38. a support shaft is arranged at the bottom of the chain; 39. a base; 40. a hexagonal flange face lock nut (M12); 41. a rubber wheel; 42. a rubber wheel mounting shaft; 43. socket head cap screws (M6X 7); 44. a second cover; 45. pile pulling auxiliary parts 451a, a first bottom beam 451b, a second bottom beam 452, a vertical column 453, a cross beam 454 and auxiliary part fixing parts; 100. A pile body; l, a clutch; J. clamping; and Q, a driving device.

Detailed Description

The following detailed description and specific examples are described in connection with the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

The clamp can be suitable for occasions of pulling out a pile body in garden engineering and the like, and can also be used in other similar application scenes, and the detailed description is given below by taking a pile puller as an example.

Referring to fig. 1-20, the structure of the preferred embodiment of the pile extractor of the present invention is shown. The pile extractor is a portable device for extracting square or round piles in soil layers out of the ground, mainly comprises a frame, a chain 24, a clutch L, a clamp J, a driving device Q and the like, wherein the chain clutch is adopted to drive and lock an arm clamp of the clamp, a pile body 100 can be automatically locked during pile extraction, and the pile body can be conveniently and safely extracted, and the following description is further provided.

As shown in fig. 1-4, the frame is in the form of a column, and has a hollow main housing 19, in which components such as a clutch, a chain 24, etc. can be installed, and a side wall of the main housing 19 is slotted for passing a slide plate and a connecting pin of a clamp. The top end of the main shell 19 is fixedly provided with a pile extractor handle 15, which is convenient for supporting during pile extracting operation. The bottom end of the main housing 19 is fixedly provided with a base 39, which is convenient for the main housing 19 to stand on the ground stably during pile pulling operation. The lower part of the main chassis 19 is provided with a roller for moving, wherein the roller can be a pair of rubber wheels 41, which is convenient for moving the pile extractor.

In this embodiment, the top of the pile extractor is configured with a driving device Q, which mainly comprises an engine 1, a reduction gearbox 9, a driving sprocket 10, and the like, wherein a sprocket housing 14 of the driving sprocket 10 is fixedly mounted on the top of a main housing 19, and a main shaft of the driving sprocket 10 is connected to the engine 1 through the reduction gearbox 9 in a transmission manner, so that the driving sprocket 10 outputs power. One end of the chain 24 is mounted on the driving sprocket 10, and the other end of the chain 24 passes through the clutch housing 28 and is suspended and mounted in the main housing 19 and tensioned, wherein the clutch housing 28 is slidably mounted inside the main housing. When starting the engine 1, the drive sprocket 10 can be made to rotate and thereby drive the chain 24. Further, an engine protector 22 is fixedly mounted on the top of the main case 19, and the engine protector 22 is fixedly mounted on and carries the engine 1 so as to prevent the engine 1 from falling. In addition, the engine is also provided with an engine throttle handle 21 for facilitating the operation of the engine 1.

In the present embodiment, the chain 24, the clutch L, and the clamp J may be attached in the following manner. The top of the chain 24 is mounted on the driving sprocket 10 and suspended in the main housing 19 of the frame, and the bottom of the chain 24 is supported and tensioned by a chain bottom support shaft 38 on the main housing 19. The clutch L is slidably mounted to the main housing 19 and is detachably connected to the chain 24 so as to follow the movement of the chain 24. The clamp J is slidably mounted to the main housing 19 and is captively slidably connected to the clutch L to drive the arm clamp of the clamp J to rotate and lock when a pile is being clamped. Thus, the chain clutch is adopted to drive and lock the arm clamp of the clamp, so that the pile body can be automatically locked during pile pulling, and the pile pulling operation can be quickly and reliably carried out.

The pile extractor disclosed by the embodiment of the invention optimizes a clamp structure and is provided with the clutch, so that the pile extracting operation is more convenient and reliable, and the following further description is provided.

As shown in fig. 5-6, and also in fig. 1-4, the pliers J specifically include a lower jaw plate 34 and a pair of upper jaw arms, namely, a first upper jaw arm 31 and a second upper jaw arm 32, which are arranged side by side. The lower jaw 34 is slidably mounted on the main housing 19, and the bottom ends of the two upper jaw arm clamps are rotatably mounted on the lower jaw 34, 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 the present embodiment, the second ends, i.e. the top ends, of the first upper jaw arm clamp 31 and the second upper jaw arm clamp 32 are respectively provided with an arc-shaped sliding groove, the arc top of each sliding groove respectively faces to the center line between the two upper jaw arm clamps, and an arm clamp driving pin 281 is respectively 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, wherein the driving device Q can move along the center line direction between the two upper jaw arm clamps, and specifically can slide up and down along the main housing 19. In this way, by providing the arc-shaped slide grooves in the two upper jaw arm clamps and fitting the arm clamp drive pins 281 therein, the upper jaw arm clamps can be rotated and translated simultaneously by the translation of the drive arm clamp drive pins, and finally the work of pulling out the workpiece can be performed. Only one set of driving mechanism is needed, so that the structure is simplified and the cost is saved.

As shown in fig. 6, the upper ends of the two upper jaw arm clamps are respectively provided with arc-shaped sliding

grooves

311, 321, which may be through grooves or sunken grooves, the arc tops of which are respectively directed toward 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 approximately arc-shaped (specifically, standard arc-shaped or non-standard arc-shaped), 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 shapes of the pile bodies 100 to be clamped, so that the arm clamp inserts 312 and 322 can be replaced according to the specifications and shapes of the pile bodies, and the pile bodies 100 can be clamped reliably.

The driving device Q in this embodiment has a chain 24 wound around a driving sprocket, and the pile pulling stroke is long compared to the cylinder. In order to ensure smooth sliding of the clamp, the clamp J is provided with a slide plate 35, the slide plate 35 has a base portion 351 and a slide portion 352, and the slide portion 352 has a long bar shape and is located at an intermediate position on the base portion 351 side. The slide plate is fixedly attached to the chain 24, wherein the base portion 351 of the slide plate 35 is located inside the track groove of the main housing 19 and the slide 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 slide plate 35 are fixed together by the hexagon socket countersunk head screw 33. Thus, the lower jaw plate 34 and the sliding plate 35 are clamped between the inner side and the outer side of the rail groove, and the lower jaw plate 34 is guided by the sliding portion 351 of the sliding plate 35 in the rail groove to ensure smooth vertical sliding. The lower ends of the two upper jaw arm clamps are hinged to the lower jaw plate 34 through arm clamp pins 36, so that the two upper jaw arm clamps can be ensured to rotate flexibly.

The drive device Q in this embodiment is provided with a clutch L comprising a clutch housing 28 and clutch pawls 27, wherein the clutch pawls 27 are hinged to the clutch housing 28 by pawl pins 29. Specifically, a first end of the clutch pawl 27 is hinged to the clutch housing 28 by a pawl pin, and a second end ratchet surface of the clutch pawl 27 is connected to/disconnected from the chain link pin shaft, thereby achieving clutching with the chain 24. An arm clip driving pin 281 is provided on the clutch housing 28 of the clutch L, and the arm clip driving pin 281 is penetratingly installed in the sliding

grooves

311, 321 so that the two upper jaw arms can be slid on the clutch housing 28 and limited accordingly. In this way, power is applied through the clutch L so that the two upper jaw clamps are automatically locked when rotated to the pile gripping position. The structure of the clutch will be described in detail below with reference to the accompanying drawings.

As shown in fig. 7-13, and with simultaneous reference to fig. 1-6, the clutch housing 28 described above is an assembly. The clutch housing 28 comprises a clutch housing plate first 282, a clutch housing plate second 283, a clutch housing plate third 284, a clutch housing plate fourth 285, a chain guide plate 286, reinforcing ribs 287 and the like, wherein the clutch housing plate first 282, the clutch housing plate second 283 and the clutch housing plate third 284 are arranged in parallel, the clutch housing plate fourth 285 and the chain guide plate 286 are respectively arranged perpendicular to the clutch housing plate second 283 and the clutch housing plate third 284, the clutch housing plate fourth 285, the chain guide plate 286, the clutch housing plate second 283 and the clutch housing plate third 284 can be welded, the clutch housing plate first 282, the clutch housing plate second 283 and the clutch housing plate third 284 can be screwed, and the reinforcing ribs 287 can be welded between the clutch housing plate second 283 and the clutch housing plate third 284 to increase strength. The shaped clutch housing 28 thus formed can be fitted with the arm clip driving pin 281, the clutch pawl 27, the slider 37, and the like, as will be described further below.

In this embodiment, two arm clamp driving pins 281 are mounted on the clutch housing plate-one 282, and they are horizontally arranged and penetratingly mounted in the sliding

grooves

311, 321. When the clutch housing 28 slides, the two arm clamp driving pins 281 make the two upper jaw arm clamps slide on the clutch housing 28 along the sliding

grooves

311, 321 respectively, and when the clutch housing 28 is limited and stopped, the two upper jaw arm clamps tightly clamp the pile body 100 for pile extraction.

In this embodiment, the clutch pawl 27 is interposed between and rotatably connected to the clutch housing plate two 283 and the clutch housing plate three 284, and the clutch pawl 27 has a ratchet surface adapted to the link pin shaft of the chain 24, and the ratchet surface engages with the link pin shaft of the chain 24, so that the coupling between the clutch L and the chain 24 can be realized, and the power of the drive apparatus can be engaged.

In this embodiment, the clutch is further provided with a sliding strip 37, and two ends of one side of the sliding strip 37 are respectively provided with a limiting plate, so that a sliding strip notch 371 is formed in the middle of the sliding strip, and the sliding strip 37 is movably installed in the clutch housing 28 through the sliding strip notch 371, and meanwhile, the sliding strip 37 can be prevented from being disengaged from the clutch housing 28. Here, the upper and lower ends of the slider notch 372 are respectively provided with slider notch

inclined planes

372 and 373, the upper end of the clutch pawl 27 is provided with a clutch pawl inclined plane, and the slider notch inclined plane 372 at the upper end is matched with the clutch pawl inclined plane, so that the clutch pawl 27 is driven to rotate forward when the two are abutted against each other, and the ratchet surface of the clutch pawl 27 is disengaged from the link pin shaft of the chain 24; one side of the lower end of the clutch pawl 27 has a clutch ratchet surface, and the other side of the lower end of the clutch pawl 27 is fitted with the slide bar notch inclined surface 373 of the lower end, so that the clutch pawl 27 is driven to rotate in the reverse direction when the clutch pawl 27 and the slide bar notch inclined surface abut against each other, whereby the ratchet surface of the lower end of the clutch pawl 27 is engaged with the link pin shaft of the chain 24. Here, the slide bar 37 is provided with a slide bar stopper 17, and the slide bar stopper 17 is fixedly attached to the tip end of the main casing 19 so as to limit the upward stroke of the slide bar 37.

In this embodiment, the clutch housing 28 can slide up and down along the main housing 19 of the rack, specifically, the second clutch housing plate 283 is slidably mounted in the track groove of the main housing 19, and the first housing plate 282 and the third clutch housing plate 284 are respectively located inside and outside the track groove; and the chain 24 is inserted through the clutch housing 19 and suspended in the main housing 19, so as to ensure the clutch housing 28 to slide smoothly.

The clamp in the embodiment is provided with a clutch to selectively access the power of the driving device, and the first jaw arm clamp 31 and the second jaw arm clamp 32 of the clamp can correspondingly slide on the clutch housing 28 and limit, and can automatically lock when the two jaw arm clamps rotate to the pile clamping position, thereby realizing the pile pulling operation quickly and reliably. The clutch structure simultaneously realizes power access and clamp locking, simplifies the product structure, and has lower equipment price and higher market competitiveness.

The portable pile pulling product adopting the clamp and the clutch structure is convenient and reliable to operate, and the assembling and using processes of the pile pulling product are described as follows.

Referring to fig. 1-3, the assembly process of the pile extractor of the present invention is as follows:

(1) the bearing 4 is mounted on the driven disk case 6 and fixed by the circlip 3 for hole. The driven plate 2 is mounted on a bearing 4 and fixed by a shaft circlip 5. The engine 1 is installed and fixed on a driven disc shell 6 and is fixed by four socket head cap screws 7; the bearing 12 is mounted in the sprocket housing 14 and fixed by the circlip 11 for hole. The drive sprocket 10 is mounted in a bearing 12 and fixed by a shaft circlip 13. The driven disc housing 6 is mounted on a reduction gearbox 9 and fixed by four socket head cap screws 8. The reduction gearbox 9 is arranged on the fixed chain wheel shell 14 and is fixed on the chain wheel shell 14 by four cylindrical-head hexagon socket head cap screws 8.

(2) The slider stopper 17 is mounted on the main housing 19 and fixed by two socket head cap screws 18. The pile extractor handle 15 is mounted on the main housing 19 and fixed by four socket head cap screws 16.

(3) The blank cap 20 and the engine throttle handle 21 are attached to positions corresponding to the engine guard 22. The engine protector 22 is mounted on the main case 19 and fixed by two socket head cap screws 23.

(4) The clutch pawls 27 are mounted in a clutch housing 28 and fixed by pawl pins 29, ensuring their rotational flexibility. Further, the slide bar 37 is installed in the clutch housing 28 so as to be movable up and down.

(5) The slide plate 35 is mounted and fixed to the chain 24 and is fixed by two socket head cap screws 33. The first and second upper jaw arm clips 31 and 32 are mounted on the lower jaw plate 34 via two jaw plate pins 36, and the jaw plate pins 36 are fixed by two elastic collars 30.

(6) The chain 24 is disengaged through the clutch housing 28 and then its lock is restored. The chain 24 and its components are mounted in the main housing 19, and the clutch housing 28, lower jaw plate 34, and slide plate 35 components are mounted on the track grooves of the main housing 19. And a chain 24 is mounted on sprocket 10.

(7) The base 39 is mounted in the corresponding position of the main housing 19 and fixed by the chain bottom support shaft 38 and the hexagonal flange locking nut 40. Two rubber wheels 41 are fixed on the main housing 19 by rubber wheel mounting shafts 42.

(8) The first cover 25 is fixedly mounted on the main housing 19 by means of two cross pan head screws 26. The second cover 44 is fixed to the main housing 19 by means of two socket head cap screws 43.

(9) If necessary, a pile pulling auxiliary 45 is further installed, and the pile pulling auxiliary 45 is installed in an auxiliary accommodating cavity of the pile pulling machine base and can be used for assisting in clamping the pile 100 to be pulled, of which the exposed ground surface height is lower than a preset value. The pile pulling auxiliary part comprises a vertical column 452, a cross beam 453, two

bottom beams

451a and 451b and the like, wherein the cross beam 453 is arranged at the top end of the vertical column 451 and is fixedly connected with a base of a frame through an auxiliary part fixing part 454 during assembly, the two bottom beams 451a and 451 are arranged at the bottom end of the vertical column 451 in a splayed mode to assist clamping of a pile to be pulled, and the assembly is easy. And finally, the complete machine assembly of the pile extractor is finished.

The assembly process described above uses a greater number of screws, collars, etc., and it will be appreciated that other components may be used to effect the connection between the components. Of course, the connection of the main components of the present invention is not limited to the above-mentioned threaded connection, bayonet connection, etc., and will not be described in detail.

Referring to fig. 13-20, the pile extractor of the present invention is convenient and reliable to use, and the basic working principle and working process thereof are as follows.

Pile pulling is prepared: as shown in fig. 14 to 15, one side of the lower end of the clutch pawl 27 is brought into contact with the lower slope of the slide bar slit at point a, and the chain 24 is brought into contact with the other side of the lower end of the clutch pawl 27 at point B, whereby the ratchet surface of the pawl pin 27 is engaged with the link pin in the chain 24. By controlling the engine throttle handle 21, power is transmitted to the transmission 9 through the engine 1, and after the speed change, the power is transmitted to the chain 24 through the driving sprocket 10 to rotate the chain (in the direction R). Since the clutch pawls 27 are caught on the chain 24, the upward movement of the chain 24 will inevitably move the clutch housing 28 together, since the second upper jaw 32 is connected to the housing pin 281 of the clutch housing 28 through the sliding slot 321 (the same applies to the first upper jaw 31). The second upper jaw arm clamp 32 and the first upper jaw arm clamp 31 are connected together through the lower jaw plate 34 to form a closed body, so that when the lower jaw plate 34 moves up and down under the driving of the sliding plate 35, the second upper jaw arm clamp 32 and the first upper jaw arm clamp 31 are necessarily driven to translate together. Because the clutch housing pin 281 is arranged in the arc-shaped sliding grooves of the first jaw arm clamp 31 and the second jaw arm clamp 32, when the clutch housing 28 moves, the first jaw arm clamp 31 and the second jaw arm clamp 32 also rotate, so that the two clamp force generate opposite clamping force through the sliding grooves of the two clamp members, and the pile body 100 to be pulled out is tightly clamped through the arm clamp inserts of the first jaw arm clamp 31 and the second jaw arm clamp 32.

Pile pulling operation: as shown in fig. 16-17, it can be seen that the sliding bar 37 ascends along with the clutch housing 28 and contacts the sliding bar stopper 17 at point D, and since the sliding bar 37 can no longer move, the clutch housing 28 and the clutch pawl 27 continue to move upward, and the inclined surface of the clutch pawl 27 contacts the inclined surface of the sliding bar 37 at point E. At this time, the clutch pawls 27 rotate about the pawl pins 29, the clutch pawls 27 disengage from the chain 24, and the clutch housing 28 loses upward tension. The jaw plate automatically descends due to self weight, and simultaneously the clamping force of the first jaw arm clamp 31 and the second jaw arm clamp 32 disappears, and the jaw plate 34 descends to the bottom together with the jaw plate. And returning to the position state before pile pulling, and continuing the next pile pulling process. And controlling whether pile pulling is required to be continued or not through an accelerator handle according to whether the length of the pile is pulled out or not. When the pile is pulled out and lifted, as shown in fig. 6 and 7, the power can be interrupted by controlling the accelerator handle, the clutch shell 28, the first jaw arm clamp 31, the second jaw arm clamp 32 and the lower jaw plate 34 automatically descend due to the dead weight, and simultaneously the clamping force of the first jaw arm clamp 31 and the second jaw arm clamp 32 disappears and descends to the bottom. And returning to the position state before pile pulling, and continuing the next pile pulling process.

It should be noted that the height of the pile 100 to be extracted from the ground may be determined as to whether the pile extraction auxiliary 45 is installed or not, as will be described below.

As shown in fig. 18, when the height H0 of the pile exposed to the ground is high, that is, the height H2 of the pile top is greater than the set height H1, the pile 100 can be pulled out without installing the pile pulling auxiliary 45.

As shown in fig. 19-20, if the height H0 of the exposed ground of the pile body is lower, the pile-pulling auxiliary 45 can be installed, and at this time, the pile-pulling auxiliary 45 is installed in the auxiliary accommodating cavity of the pile-pulling machine base, so as to assist in clamping the pile 100 to be pulled, whose exposed ground surface height is lower than the preset value.

In the pile pulling process, the chain clutch is used for driving and locking the arm clamp of the clamp, the pile body can be automatically locked in the pile pulling process, so that the operation is convenient and reliable, the chain driving can increase the pile stroke to be longer, the equipment price is also favorably reduced, and the embodiment of the invention has better market prospect.

It should be noted that the above embodiments all use the pile 100 to be pulled as a workpiece to explain the structure, principle and operation of the clamp and its locking mechanism. It will be appreciated that the pliers and their locking mechanism may be used in other similar applications where gripping a corresponding workpiece is required for operation and will not be described in detail.

The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.

Claims

1. The utility model provides a clamp, a serial communication port, including lower jaw plate and two upper jaw arm clamps of arranging side by side, the first end of each upper jaw arm clamp is rotationally installed in lower jaw plate respectively, the second end of each upper jaw arm clamp sets up curved sliding tray respectively, the arc top of each sliding tray is towards two central lines of going up between the jaw arm clamp respectively, and wear to establish respectively in each sliding tray and pack into an arm clamp driving pin, lower jaw plate and two arm clamp driving pins are connected to drive arrangement respectively, wherein drive arrangement can follow two central line direction movements of going up between the jaw arm clamp.

2. The clamp of claim 1, wherein the two arm clamp drive pins are symmetrically disposed on either side of a center line between the two upper jaw arm clamps; and/or the clamping side of each upper jaw arm clamp is respectively arc-shaped; and/or an arm clamp insert is arranged in the middle of the clamping side of each upper jaw arm clamp.

3. The pliers of claim 1, wherein the drive means comprises a chain trained about a drive sprocket, wherein the chain has a slide plate fixedly mounted thereon, the slide plate being fixedly mounted with the lower jaw plate, and wherein the first end of each upper jaw arm clamp is hingedly connected to the lower jaw plate by a jaw plate pin.

4. The clamp of claim 3, wherein the base portion of the slide plate is located inside the rail groove of the main housing of the frame, and the slide portion of the slide plate is located in the rail groove; the lower jaw plate is positioned at the outer side of the track groove and is fixedly connected with the sliding part of the sliding plate.

5. The clamp as claimed in claim 1, wherein the driving means is provided with a clutch, wherein a first end of the clutch pawl is hinged to the clutch housing by a pawl pin, a second end ratchet surface of the clutch pawl is connected to the chain link pin shaft in an engageable/disengageable manner, and the two arm clamp driving pins are fixedly mounted to the clutch housing, respectively.

6. The tongs as claimed in claim 5, wherein the clutch is provided with a slide bar, both ends of one side of the slide bar are respectively provided with a limiting plate so that the upper and lower ends of the middle part of the slide bar are respectively formed with a slide bar slit having a slit inclined surface, and the slide bar is movably installed in the clutch housing through the slide bar slit; the upper end of the clutch pawl is provided with a clutch pawl inclined plane, and the opening inclined plane at the upper end of the sliding strip is matched with the clutch pawl inclined plane so as to drive the clutch pawl to rotate positively when the clutch pawl and the clutch pawl are in contact with each other, so that the clutch pawl is separated from the chain link pin shaft; one side of the lower end of the clutch pawl is provided with a clutch pawl inclined plane, and the other side of the lower end of the clutch pawl is matched with the sliding strip notch inclined plane at the lower end, so that the clutch pawl is driven to rotate reversely when the clutch pawl and the sliding strip notch inclined plane are abutted against each other, and the clutch pawl is combined with the chain link pin shaft.

7. The clamp as claimed in any one of claims 4 to 6, wherein the top of the chain is inserted through the clutch housing and suspended in the main housing, the bottom of the chain is supported and tensioned by a support shaft at the bottom of the chain on the main housing, and the sliding plate and the clutch housing are respectively mounted in a track groove formed in one side wall of the main housing.

8. A pile extractor comprising a frame, wherein the frame is provided with a clamp according to any one of claims 1-7, and the clamp is used for clamping a pile to be extracted by driving two upper jaw arm clamps during operation to extract the pile.

9. The pile extractor of claim 8, wherein a pile extracting aid is provided, the pile extracting aid being installed in an aid receiving cavity of the pile extractor base to aid in holding a pile to be extracted whose exposed ground surface height is lower than a predetermined value.

10. The pile extractor as claimed in claim 9, wherein the pile extracting auxiliary comprises a vertical column, a cross beam and two bottom beams, the cross beam is disposed at the top end of the vertical column to be fixedly connected with the base, and the two bottom beams are disposed at the bottom end of the vertical column in a splayed shape to assist in clamping the pile to be extracted.