CN218370398U - Device is got to crossbeam clamp - Google Patents

Abstract

The utility model discloses a device is got to crossbeam clamp, including support frame, slide mechanism, elevating system and fixture. Specifically, a guide rod is fixed on the support frame, and the sliding mechanism comprises a sliding frame which is connected to the guide rod in a sliding manner; the lifting mechanism is connected with the sliding mechanism and comprises a screw rod vertically penetrating through the sliding frame and a connecting frame connected to the screw rod; the clamping mechanism is arranged on the lifting mechanism and comprises a fixed frame fixed at the bottom of the connecting frame and a clamping assembly arranged on the fixed frame. According to the design, the cross beam is taken and placed through the clamping assembly, the lead screw ascends and descends on the sliding frame, the clamping mechanism is driven to ascend and descend to adjust the height of the clamping assembly, the cross beams with different heights are adapted, the lifting mechanism can be driven to translate through the sliding mechanism, the clamping mechanism is driven to translate to clamp or place the cross beams at different positions, manual carrying is not needed, carrying time is effectively saved, and working efficiency is improved.

Description

Device is got to crossbeam clamp

Technical Field

The utility model relates to a construction equipment technical field, concretely relates to device is got to crossbeam clamp.

Background

In the prior art, the top cover of the steel structure modularization house box is formed by welding a top frame and a top corrugated plate. The top frame is generally formed by welding two main longitudinal beams which are parallel to each other and are longer (6-13 meters) and a plurality of beams (generally, secondary transverse beams which are parallel to each other, shorter than the main longitudinal beams and have variable quantities, and a part of the top frame also comprises a middle transverse beam with a larger cross section area and a shorter secondary longitudinal beam) with variable quantities between the two main longitudinal beams. According to a traditional top frame and beam feeding method, beams are lifted up manually and placed on a tooling jig frame one by one, and then the beams and longitudinal beams are welded together manually, so that the method consumes time and labor.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in that during the construction steel construction modularization room case among the prior art, the transport crossbeam is very inconvenient, and will consume very big time and manpower, defect that work efficiency is low to a device is got to the crossbeam clamp is provided.

In order to solve the technical problem, the technical scheme of the utility model as follows:

a beam clamp apparatus comprising:

the support frame is provided with a guide rod;

the sliding mechanism comprises a sliding frame which is connected to the guide rod in a sliding mode, and the sliding frame can translate along the length direction of the guide rod;

the lifting mechanism is connected with the sliding mechanism and comprises a screw rod vertically penetrating through the sliding frame and a connecting frame connected to the screw rod;

and the clamping mechanism is arranged at the bottom of the lifting mechanism and comprises a fixed frame fixedly arranged at the bottom of the connecting frame and a clamping component arranged on the fixed frame.

Furthermore, at least two groups of clamping assemblies are arranged, and the two groups of clamping assemblies are respectively connected to two opposite ends of the fixing frame and are oppositely arranged; the clamping assembly further comprises a connecting shaft fixed at the end of the fixing frame, a clamping jaw fixedly connected to the connecting shaft, and an air cylinder connected between the connecting shaft and the fixing frame and suitable for controlling the connecting shaft to rotate.

Furthermore, the sliding mechanism comprises sliding rails arranged on the guide rod and pulleys arranged at four corners of the sliding frame and positioned on the sliding rails, and the width of each sliding rail is smaller than that of the guide rod.

Furthermore, the sliding frame is a rectangular frame, a cross beam group and a longitudinal beam group are horizontally arranged in the sliding frame, the cross beam group comprises two cross rods arranged at intervals, and the longitudinal beam group comprises two longitudinal rods arranged at intervals; the lead screw is provided with two at least, and two one end of lead screw is fixed respectively on the relative both sides of link, and the other end slides and sets up two between the vertical pole, and be located respectively the both ends of vertical pole.

Furthermore, the lifting mechanism further comprises fixing rods vertically arranged on the connecting frame, at least two fixing rods are arranged on the fixing rods, one ends of the two fixing rods are respectively located at two opposite ends of the connecting frame, and the other ends of the two fixing rods are arranged between the two cross rods and are respectively located at two ends of the cross rods.

Furthermore, the fixing rod is sleeved with a fixing sleeve positioned between the two cross rods, the fixing sleeve is provided with guide wheels capable of rolling along the outer surface of the fixing rod, and the fixing sleeve is provided with at least two guide wheels which are respectively positioned at two opposite sides of the fixing rod.

Furthermore, the two screw rods are connected between the two longitudinal rods through fixing blocks, a gear shaft is arranged between the two screw rods, and cylindrical gears meshed with the two screw rods are arranged at two ends of the gear shaft.

Furthermore, two ends of the gear shaft are respectively and fixedly installed on the two fixing blocks through cushion blocks; the fixing block is provided with a linear bearing, and the screw rod penetrates through the linear bearing.

Furthermore, the connecting shaft is rotatably connected to the fixed frame through a first bearing with a seat.

Furthermore, at least three clamping jaws are arranged and are respectively positioned in the middle and two end parts of the connecting shaft; the clamping assembly further comprises a clamping plate connected among the three clamping jaws, and the clamping plate is located at one end, far away from the fixing frame, of each clamping jaw.

The utility model discloses technical scheme has following advantage:

1. the utility model provides a device is got to crossbeam clamp sets up the support frame that has the guide arm, sets up slide mechanism on the support frame, and slide mechanism is connected with elevating system including following the gliding carriage of guide arm on the slide mechanism, and elevating system includes the vertical lead screw of wearing to establish on the carriage and connects the link on the lead screw, and fixture is installed to the link bottom, and fixture is including fixing the mount in the link bottom and installing the centre gripping subassembly on the mount. So set up, can get through fixture's centre gripping subassembly and put the crossbeam, carry out the oscilaltion on the carriage through the lead screw, thereby drive fixture and carry out the height of vertical lift in order to adjust centre gripping subassembly, in order to adapt to press from both sides the crossbeam of getting and placing different height position, can drive elevating system through slide mechanism and carry out the translation along the length direction of lead screw, and then drive fixture who connects on the link and carry out the translation in order to press from both sides the crossbeam of getting different positions or place the crossbeam in different positions department, need not the manpower transport, effectively save the transport time, and the work efficiency is improved simultaneously.

2. The utility model provides a beam clamping device, which is provided with at least two groups of clamping components, wherein the two groups of clamping components are respectively connected with the two opposite ends of a fixed frame and are oppositely arranged; the clamping assembly further comprises a connecting shaft fixed at the end of the fixing frame, a clamping jaw fixedly connected to the connecting shaft, and an air cylinder connected between the connecting shaft and the fixing frame and suitable for controlling the connecting shaft to rotate. With the arrangement, the cross beam can be clamped by the clamping jaws on the two groups of clamping mechanisms which are oppositely arranged; the cylinder control connecting axle rotates through the turned angle of adjustment connecting axle to can adjust the interval between two sets of clamping jaws, snatch with the crossbeam that adapts to different length, can control the elasticity of clamping jaw simultaneously and snatch the crossbeam and put down.

3. The utility model provides a device is got to crossbeam clamp, slide mechanism including install the slide rail on the guide arm with set up at four corners of carriage, just be located the pulley on the slide rail, the width of slide rail is less than the width of guide arm. So set up, can make the pulley when sliding on the slide rail, form supporting role to the pulley through the guide bar to guarantee the stability of pulley when removing.

4. The utility model provides a crossbeam clamping device, the carriage is a rectangular frame, and the inside is provided with a crossbeam group and a longeron group which are crossed, the crossbeam group comprises two cross rods which are arranged at intervals, and the longeron group comprises two longitudinal rods which are arranged at intervals; the lead screw is provided with two at least, and the one end of two lead screws is fixed respectively on the relative both sides of link, and the other end slides and sets up between two vertical poles, and is located the both ends of vertical pole respectively. So set up, make two lead screws be located between two vertical poles, can carry on spacingly to the lead screw, avoid the lead screw to take place the skew when the oscilaltion, and then guarantee the link and carry out the stability when the oscilaltion along with the lead screw.

5. The utility model provides a device is got to crossbeam clamp, fall the mechanism and still include the dead lever of vertical setting on the link, the dead lever is provided with two at least, and the one end of two dead levers is located the relative both ends of link respectively, and the other end setting is between two horizontal poles, and is located the both ends of horizontal pole respectively. So set up, make two dead levers be located between two horizontal poles, can carry out spacing direction to the dead lever, two dead levers are located between two horizontal poles, and are located the both ends of horizontal pole respectively, can further guarantee the stability of link when carrying out the oscilaltion along with the lead screw, and then avoid the link to take place the skew when going up and down along with the lead screw and influence the clamp of device and get the accuracy.

6. The utility model provides a device is got to crossbeam clamp, the cover is equipped with the fixed cover that is located between two horizontal poles on the dead lever, is provided with the rolling leading wheel of surface that can follow the dead lever on the fixed cover, is provided with two at least leading wheels on same fixed sheathe in, and is located the relative both sides of dead lever respectively. So set up, can make the dead lever more smooth and easy when the oscilaltion through the leading wheel, simultaneously, the leading wheel is located the relative both sides of dead lever, can carry on spacingly to the dead lever through two leading wheels, further guarantees the stability of dead lever when the oscilaltion.

7. The utility model provides a device is got to crossbeam clamp, two lead screws all connect between two vertical poles through the fixed block, are provided with the gear shaft between two lead screws, and the both ends of gear shaft are provided with the roller gear with two lead screw meshings. So set up, can make two lead screws keep synchronous motion to guarantee the link and carry out the stability of oscilaltion along with the lead screw.

8. The utility model provides a beam clamping device, which has at least three clamping jaws, wherein the three clamping jaws are respectively positioned at the middle part and two end parts of a connecting shaft; the clamping assembly further comprises a clamping plate connected among the three clamping jaws, and the clamping plate is located at one end, far away from the fixing frame, of each clamping jaw. So set up, can guarantee clamping stability through three clamping jaw, through the one end connecting splint of keeping away from the mount at three clamping jaw, can press from both sides through the fixture of two sets of relative settings and get the crossbeam when press from both sides and carry on spacingly through splint to the both ends of crossbeam, avoid the crossbeam to drop.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a three-dimensional structure diagram of a beam clamping device according to an embodiment of the present invention;

FIG. 2 is a diagram showing the connection of the slide mechanism, the lift mechanism and the holding mechanism in the present embodiment;

FIG. 3 is an enlarged view of FIG. 1 at A;

fig. 4 is a perspective view of the fixing cover of the present embodiment.

Description of reference numerals: 1. a support frame; 11. a guide bar; 12. a support pillar; 13. reinforcing the inclined beam; 2. a carriage; 21. a slide rail; 22. a pulley; 23. a cross bar; 24. a longitudinal bar; 25. connecting sheets; 3. a connecting frame; 31. a screw rod; 32. a gear shaft; 33. a cylindrical gear; 34. a fixed block; 35. a cushion block; 36. a linear bearing; 37. a fixing rod; 38. fixing a sleeve; 39. a guide wheel; 310. a second rolling bearing; 4. a fixed mount; 41. a clamping jaw; 42. a connecting shaft; 43. a cylinder; 44. a connecting shaft; 45. a first pedestal bearing; 46. and (5) clamping the plate.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

A beam clamping device as shown in fig. 1-4, comprising a support frame 1, a sliding mechanism, a lifting mechanism and a clamping mechanism. Specifically, two parallel guide rods 11 are welded and fixed on the support frame 1, and the sliding mechanism comprises a sliding frame 2 which is connected to the two guide rods 11 in a sliding manner; the lifting mechanism is connected with the sliding mechanism and comprises a screw rod 31 vertically arranged on the sliding frame 2 in a penetrating way and a connecting frame 3 connected on the screw rod 31; the clamping mechanism is arranged at the bottom of the lifting mechanism and comprises a fixed frame 4 fixedly arranged at the bottom of the connecting frame 3 and a clamping assembly arranged on the fixed frame 4.

This kind of device is got to crossbeam clamp, get through fixture's centre gripping subassembly and put the crossbeam, go on the oscilaltion through lead screw 31 on carriage 2, thereby drive fixture and carry out the height of vertical lift with adjustment centre gripping subassembly, with the crossbeam of getting and placing different height position is got to the adaptation, can drive elevating system along guide arm 11's length direction through slide mechanism and carry out the translation, and then drive the fixture who connects on the link 3 and carry out the translation with the crossbeam of getting different positions or place the crossbeam in different positions department, need not the manpower transport, effectively save the transport time, and simultaneously, the work efficiency is improved.

In this embodiment, four supporting columns 12 are further fixedly mounted at the bottom of the supporting frame 1, and a reinforcing oblique beam 13 is connected between the supporting columns 12 and the supporting frame 1. By the arrangement, the strength and stability of the supporting frame 1 can be improved by the reinforcing oblique beam 13.

In this embodiment, the sliding mechanism further includes a sliding rail 21 fixedly mounted on the guide rail and pulleys 22 located on the sliding rail 21 and located at four corners of the sliding frame 2. Specifically, the width of the slide rail 21 is smaller than the width of the guide bar 11. By means of the arrangement, when the pulley 22 slides on the slide rail 21, the guide rod 11 can support the pulley 22, so that the stability of the pulley 22 during movement can be ensured.

Specifically, the sliding frame 2 is a rectangular frame, and a cross beam group and a longitudinal beam group are arranged inside the sliding frame 2, wherein the beam group comprises two transverse rods 23 which are transversely welded on the sliding frame 2 and are arranged at intervals, and the longitudinal beam group comprises two longitudinal rods 24 which are longitudinally welded on the sliding frame 2 and are arranged at intervals; the number of the screw rods 31 is at least two, one end of each of the two screw rods 31 is welded and fixed on two opposite sides of the connecting frame 3, and the other end of each of the two screw rods 31 is slidably arranged between the two longitudinal rods 24 and is located at two ends of each of the longitudinal rods 24. So set up, make two lead screws 31 be located between two vertical poles 24, can carry on spacingly to lead screw 31, avoid lead screw 31 to take place the skew when the oscilaltion, and then guarantee link 3 and carry out the stability of oscilaltion along with lead screw 31.

In this embodiment, the lifting mechanism further includes fixing rods 37 vertically disposed on the connecting frame 3, the fixing rods 37 are disposed at least two, one ends of the two fixing rods 37 are respectively welded and fixed on two opposite ends of the connecting frame 3, and the other ends are disposed between the two cross rods 23 and located at two ends of the cross rods 23. So set up, make two dead levers 37 be located between two horizontal poles 23, can carry out spacing direction to dead lever 37, two dead levers 37 are located between two horizontal poles 23, and are located the both ends of horizontal pole 23 respectively, can further guarantee the stability of link 3 when carrying out the oscilaltion along with lead screw 31, and then avoid link 3 to take place the skew when going up and down along with lead screw 31 and influence the clamp of device and get the accuracy.

Specifically, two screw rods 31 are connected between the two longitudinal rods 24 through fixing blocks 34, a gear shaft 32 is arranged between the two screw rods 31, and cylindrical gears 33 meshed with the two screw rods 31 are arranged at two ends of the gear shaft 32. Two ends of the gear shaft 32 are respectively fixedly arranged on the two fixed blocks 34 through cushion blocks 35; the fixing block 34 is provided with a linear bearing 36, and the screw rod 31 is arranged on the linear bearing 36 in a penetrating way. So set up, can make two lead screws 31 keep synchronous motion to guarantee link 3 and carry out the stability of oscilaltion along with lead screw 31.

In this embodiment, the fixing rod 37 is sleeved with a fixing sleeve 38 located between the two cross rods 23, the fixing sleeve 38 is provided with a guide wheel 39 capable of rolling along the outer surface of the fixing rod 37, the same fixing sleeve 38 is provided with two groups of guide wheels 39, the two groups of guide wheels 39 are located at the upper end and the lower end of the fixing sleeve 38 respectively, and each group of guide wheels 39 comprises four guide wheels 39 and is located on four sides of the fixing rod 37 respectively. Specifically, the central portion of the fixed sleeve 38 is welded with the connecting pieces 25 fixed to the two cross bars 23 and the upper portion. So set up, can make dead lever 37 more smooth and easy when the oscilaltion through leading wheel 39, simultaneously, leading wheel 39 is located the relative both sides of dead lever 37, can carry on spacingly to dead lever 37 through two leading wheels 39, further guarantees the stability of dead lever 37 when the oscilaltion. Meanwhile, the connecting piece 25 is welded in the middle of the fixing sleeve 38, so that the connecting strength between the fixing sleeve 38 and the cross rod 23 can be enhanced.

In this embodiment, the clamping assemblies are provided in two sets, and the two sets of clamping assemblies are respectively located at two opposite ends of the fixing frame 4 and are oppositely arranged. Specifically, the clamping assembly further comprises a connecting shaft 4442 located at the end of the fixed frame 4, a clamping jaw 41 fixedly connected to the connecting shaft 4442, and an air cylinder 43 connected between the connecting shaft 4442 and the fixed frame 4 and adapted to control the connecting shaft 4442 to rotate. Two sets of first belt seat bearings 45 are respectively and fixedly arranged at the two opposite ends of the fixing frame 4, each set of the fixing frame comprises two first belt seat bearings 45, and the connecting shaft 4442 is connected to the two first belt seat bearings 45 in the same set in a rotating mode. With the arrangement, the cross beam can be clamped by the clamping jaws 41 on the two groups of clamping mechanisms which are oppositely arranged; the air cylinder 43 controls the connecting shaft 4442 to rotate, and the distance between the two groups of clamping jaws 41 can be adjusted by adjusting the rotating angle of the connecting shaft 4442, so that the clamping jaws 41 can be adapted to clamping cross beams with different lengths, and meanwhile, the tightness of the clamping jaws 41 can be controlled to clamp and lay down the cross beams.

Specifically, each group of clamping assemblies is provided with three clamping jaws 41, and the three clamping jaws 41 are respectively positioned in the middle and two end parts of the same connecting shaft 4442; the clamping assembly further comprises a clamping plate 46 connected between the three clamping jaws 41, the clamping plate 46 being located at the end of the clamping jaw 41 remote from the holder 4. When clamping the cross beam, the clamping jaws 41 on both sides are respectively clamped at both ends of the cross beam, and one cross beam can be clamped between the two clamping plates 46, or a plurality of cross beams can be clamped simultaneously. So set up, can guarantee clamping stability through three clamping jaw 41, through the one end connecting splint 46 of keeping away from mount 4 at three clamping jaw 41, can press from both sides through the fixture of two sets of relative settings and get the crossbeam when getting the crossbeam spacing through splint 46, avoid the crossbeam to drop. Meanwhile, a plurality of cross beams are clamped through the clamping plates 46, so that the clamping efficiency can be effectively improved.

To sum up, this kind of device is got to crossbeam clamp, get through fixture's centre gripping subassembly and put the crossbeam, go up and down through lead screw 31 on carriage 2, thereby it goes up and down to drive fixture and carry out the height of vertical lift in order to adjust centre gripping subassembly, with the crossbeam of different height positions is got and is placed in the adaptation clamp, can drive elevating system through slide mechanism and carry out the translation along the length direction of guide arm 11, and then drive the fixture who connects on link 3 and carry out the translation in order to press from both sides the crossbeam of getting different positions or place the crossbeam in different positions department, need not the manpower transport, effectively save the transport time, improve work efficiency simultaneously.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims (10)

1. A device is got to crossbeam clamp, its characterized in that includes:

the support frame (1) is provided with a guide rod (11);

the sliding mechanism comprises a sliding frame (2) which is connected to the guide rod (11) in a sliding mode, and the sliding frame (2) can translate along the length direction of the guide rod (11);

the lifting mechanism is connected with the sliding mechanism and comprises a screw rod (31) vertically arranged on the sliding frame (2) in a penetrating way and a connecting frame (3) connected to the screw rod (31);

and the clamping mechanism is arranged at the bottom of the lifting mechanism and comprises a fixed frame (4) fixedly arranged at the bottom of the connecting frame (3) and a clamping assembly arranged on the fixed frame (4).

2. The beam clamping device as claimed in claim 1, wherein there are at least two sets of clamping assemblies, and the two sets of clamping assemblies are respectively connected to two opposite ends of the fixed frame (4) and are oppositely arranged; the clamping assembly further comprises connecting shafts (44) and (42) fixed at the end parts of the fixing frames (4), clamping jaws (41) fixedly connected to the connecting shafts (44) and (42), and air cylinders (43) connected between the connecting shafts (44) and (42) and the fixing frames (4) and suitable for controlling the connecting shafts (44) and (42) to rotate.

3. The beam clamp apparatus as claimed in claim 1, wherein the sliding mechanism includes sliding rails (21) installed on the guide bar (11) and pulleys (22) provided on the sliding rails (21) at four corners of the sliding frame (2), and the width of the sliding rails (21) is smaller than the width of the guide bar (11).

4. The beam clamping device as claimed in claim 1, wherein the sliding frame (2) is a rectangular frame, a cross beam group and a longitudinal beam group are horizontally arranged in the sliding frame (2), the cross beam group comprises two spaced cross beams (23), and the longitudinal beam group comprises two spaced longitudinal beams (24); the number of the screw rods (31) is at least two, one end of each screw rod (31) is fixed to the two opposite sides of the connecting frame (3), and the other end of each screw rod is arranged between the two longitudinal rods (24) in a sliding mode and located at the two ends of the longitudinal rods (24) respectively.

5. The beam clamping device as claimed in claim 4, wherein the lifting mechanism further comprises at least two fixing rods (37) vertically arranged on the connecting frame (3), one end of each of the two fixing rods (37) is located at the opposite ends of the connecting frame (3), and the other end of each of the two fixing rods (37) is located between the two cross rods (23) and located at the two ends of the cross rod (23).

6. The beam clamping device as claimed in claim 5, wherein said fixed rod (37) is sleeved with a fixed sleeve (38) located between two of said cross bars (23), said fixed sleeve (38) is provided with a guide wheel (39) capable of rolling along the outer surface of said fixed rod (37), and at least two of said guide wheels (39) are provided on the same fixed sleeve (38) and located on opposite sides of said fixed rod (37).

7. The beam clamping device as claimed in claim 4, wherein the two screw rods (31) are connected between the two longitudinal rods (24) through fixing blocks (34), a gear shaft (32) is arranged between the two screw rods (31), and cylindrical gears (33) meshed with the two screw rods (31) are arranged at two ends of the gear shaft (32).

8. The beam clamping device as claimed in claim 7, wherein two ends of the gear shaft (32) are respectively fixedly mounted on the two fixing blocks (34) through cushion blocks (35); the fixing block (34) is provided with a linear bearing (36), and the screw rod (31) penetrates through the linear bearing (36).

9. A beam clamp according to claim 2, characterized in that said connecting shaft (44) (42) is rotatably connected to said fixed frame (4) by means of a first seated bearing (45).

10. The beam clamp according to claim 2, wherein the clamping jaws (41) are provided in at least three, the three clamping jaws (41) being located at the middle and both ends of the connecting shaft (44) (42), respectively; the clamping assembly further comprises a clamping plate (46) connected among the three clamping jaws (41), and the clamping plate (46) is located at one end, away from the fixed frame (4), of each clamping jaw (41).

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