KR20110003932U - The hydraulic pressure type wood clamps structure - Google Patents

Abstract

The present invention is a hydraulic wooden clip structure, the lower housing 100 for hinge mounting the claws; One upper end portion of the tongs rotation shaft is disposed outside the claws 28, the outer claw gear hands 28a having three teeth added to the inner surface; The wooden pick-up part 200 and the other upper part of the tongs rotation shaft are hinged to the inner claws 29 which are welded by adding two pieces of inner forefinger hands 29a having three teeth to the padding board 29b on the flat outer surface. ; Tongs claw operation unit 300 hinged to both sides of the pincers fixed chassis (26) of the wood picking portion; and input and output to the tongs cylinder (30) of the claw operation unit 300 through the pivot shaft hydraulic oil provided from the fork A pivot shaft 400; After assembling the gear case 17 on the rectangular box, a hydraulic motor 16 for driving the lid and the hydraulic motor gear shaft 20a of the gear case 17 is installed, and assembled with the upper end of the shibel joint shaft 25. The upper housing (500), which has a shibel joint outer case (12) installed on the upper side of the hydraulic motor and bolted to the gear case upper cover (13) in which the fork-lane connecting top plate (11) on which the fork-lane connecting piece (10) is assembled is integrally coupled. It relates to a hydraulic wooden tongs structure, characterized in that consisting of.

Hydraulic, solid wood, tongs, shevel joint

Description

The hydraulic pressure type wood clamps structure

The present invention is a hydraulic wooden clip structure, and is attached to the hydraulic boom of the fork-lane to a grab device structure for picking up or lowering the wood in the vehicle.

Common wooden tongs are hydraulic pumped from hydraulic pump of fork-lane, and the two wooden tongs are pinched or extended from the left and right around the hinge axis installed on the wooden tongs to pick up or raise the wood, or turn the sieve to lift the wood. The main task is to make it work.

Therefore, the grab equipped with the pivoting shaft of the claws is supplied with hydraulic pressure through the pivoting svelbel joint, and the system adopts a method of transferring the hydraulic pressure to the hydraulic cylinder which operates the claws while turning the grab without exposing the hydraulic hose. to be.

In recent years, in addition to the above-mentioned wood work, the situation is used as a multi-purpose equipment in the field of flood damage or accumulation of shafts. In the past, only the work of loading and unloading the wood wrapped in the claws was carried out, but even the work of digging or lifting the rock, The spur gear, an interlocking gear applied to the pivot shaft of wooden claws, suffered from abrasion and breakage of the gears and required a higher horsepower hydraulic pump to turn the grab.

In addition, a lot of load was applied to the pivoting axis of the Siebel joint, which supplemented the durability of the Siebel joint, accompanied by an increase in manufacturing cost.

Document 1 KR 20-0227816 Y1 2001.04.06

[Document 2] KR 20-0355206 Y1 2004.06.25

Document 3 KR 20-0383716 Y1 2005.04.29

Document 4 KR 10-2009-0000351 A 2009.1.7

Hydraulic wooden tongs structure according to the present invention is a problem of the conventional wooden tongs, as described above, in the linkage between the tongs in the document technology 1 as described above, the frame is installed at the bottom of the rotorbait, and a pair of tongs are rotatably installed, The tongs are driven at different opening and closing speeds as the hydraulic flow rates of the cylinder rod and the cylinder body are different, such as the clamping device of the cylinder body hingedly coupled to the other side of the tongs. Due to the horizontal arrangement of, the inner side of the claw is always trying to solve the problem of not holding a small thickness because a certain space remains.

In addition, spherical gears were adopted at the same displacement angle by attaching spur gears, which were installed on both sides of the tongs in Literature 2, which is the original technique of the applicant. Considering the problem of weak durability due to the weakness of the worm gear system, the spherical gear is installed on the outer side of the grab joint by mounting the shibel joint on the grab base plate equipped with the claws so that the pivot shaft is smooth even when the grab device is loaded with weight. In Literature 3, which improves the swinging motion of the spline driven gear combined with the watch, the durability of the swinging shaft is improved. However, only the double row bearings installed on the intermediate spur gears of the Siebel joint shaft act unreasonably. Due to the heavy load, it is necessary to adopt a high horsepower hydraulic motor. Wins was still a problem.

On the other hand, in the document 4, the wooden housing using an excavator, the upper housing installed to be rotatable at the tip of the excavator boom, and the lower housing connected to the upper housing rotatably through a rotary joint, rotatable by the swing motor And, the sound collecting operation by one jaw cylinder hydraulically operated in the lower housing is carried out, the wooden collector is installed in the lower housing, in particular, the lower housing one side is characterized in that the wood cutting section equipped with a saw, As in the prior art 1, the claws have different opening and closing operations, and due to the arrangement of horizontally placed jaw cylinders mounted between the claws, the inside of the claws always has a certain space, so that a small thickness cannot be held. Shaft structure of the rotary joint by excessive weight in the lower housing such as wood cutting We can see that the cost of the composition increases in accordance with the frame structure in the sub-housing.

In view of the above, the present invention improves the durability of the interlocking gear installed on the hinge shaft of the wooden tongs used for various purposes in recent years, and improves its durability, and solves the gear breakage due to the opening / closing response speed and backlash of the claws. In addition, it is possible to handle various tasks with a minimum holding space between the claws, and also improves the structure of the shibel joint shaft system and the hydraulic motor drive shaft of the grab part equipped with the claws. The purpose is to provide.

The biggest improvement effect according to the hydraulic wood clamp structure of the present invention is the wooden picking portion 200 which is hinged to the lower housing 100. In order to prevent the outer claws 28, the outer claws gear hand 28a of the number of teeth added to the inner surface of the top 28; The upper hinge hinge portion of each of the upper hinge hinge portions consisting of two inner forefinger hands (29a) having three teeth on the padding plate (29b) and welded to each side of the pad (29b) on the flat outer surface of each other Durability was improved in local abrasion according to the expansion of).

In addition, frequent breakage of the meshing by the conventional spur gears on the upper end of both of the tongs rotary shafts is the outer claw gear hand (28a) having three teeth; The other upper part of the tongs rotation shaft is attached to the padding board 29b on the flat outer surface, and two pieces of inner forefinger hands 29a having three teeth are welded to each other. In the gripped body opening operation, the hydraulic force blocks backlash due to the backflow to expand the stability and to extend the durability.

In addition, the pivot shaft 400 is a lower end portion of the chisel joint shaft 25 for inputting and outputting hydraulic oil to the tongs cylinder 30 of the tongs operation unit 300 to which the tongs fixed on the tongs fixed top plate 24 is assembled. A tongs fixed top determination jaw portion (25h) supported at the bottom of the (24); Shibel joint fixing gear 18, bushing 19, and bushing on bushing at the same time to crimp and support the fixed gear step 25d provided at the same height as the shibel joint shaft boss 24a welded to the tong fixing plate 24 Shibel joint shaft bearing 15a axially coupled to the inner circumference of the joint case 12, and the shibel joint shaft bearing 15a axially coupled to the hollow portion of the fork-lane connecting top plate 11 welded to the upper end of the shibel joint case 12. The lower housing is secured by a structure in which the Siebel joint head fixing plate 14 is firmly coupled to the Siebel joint shaft 25 by the Siebel joint head fixing bolt 14a so as to be supported by the swinging motion of the inner ring frame and the celebratory room. Reinforced pivot system and fork-lane connecting piece (10) for absorbing the impact according to the operation of picking up or digging the workpiece and the weight received directly below the pivot shaft 400 by the weight of itself and the weight of wood or rock (10) From the pivot shaft 400 to the To output means to provide a smooth hydraulic fluid.

In addition, there are few hydraulic motors 16 in the gear case 17 of the upper housing 500, and the first reduction gear 21 having one axis with the second reduction gear 22 is provided on the Shibel joint fixed gear 18. Hydraulic pressure is supported by the hydraulic motor shaft bearing 20b so that the reduction gear shaft 22a is not coupled with the reduction gear bearing 23a, and the hydraulic motor gear 20 is engaged with the second reduction gear 22. By the motor gear shaft (20a), by turning to a reduction ratio of 7.1: 1 to reduce the size of the conventional 310cc hydraulic motor to 200cc is a useful design that showed an improved effect in terms of weight and manufacturing cost.

In order to achieve the above object, the configuration of the present invention by the accompanying drawings as follows.

Figure 1 is a perspective view of the present invention, Figure 2 is a longitudinal cross-sectional view of the Swivel joint (swivel joint) of the head rotation axis of the present invention, Figure 3 is an exploded perspective view of the Shibel joint part of the head rotation axis of the present invention, Figure 4 is a tongs of the present invention The exploded perspective is explained with reference to each.

In order to reduce the weight, each of the corners of the tongs fixed upper plate 24 on the rectangular plate body cut in an arc is fixed to the tongs fixing chassis 26 on both sides of the inner side in the longitudinal direction, but the pipe chain to the inner center of the tongs fixing chassis Welding installation to penetrate the two tongs rotary shaft pipe (26a), and through the inner side of the short pipe chain fixed shaft boss (26b) through each of the protrusions than the tongs rotary shaft pipe to protrude and weld, the tongs fixed plate (24) A lower housing (100) welded to the clamping foot fixing outer bracket (27) in which the tongs rotating shaft hole (27a) is drilled at both sides in the longitudinally downward outer border;

The two tongs fixed shaft 26, which is fixed to both sides by the tongs rotary shaft pipe 26a, and the two tongs rotary shaft 31 penetrating the tongs fixed outer bracket 27, each of which is curved inwardly when the tongs are bitten up. Close contact and both sides are operated at the same opening and closing angle; One upper end portion of the tongs rotation shaft is disposed outside the claws 28, the outer claw gear hands 28a having three teeth added to the inner surface; The wooden pick-up part 200 and the other upper part of the tongs rotation shaft are hinged to the inner claws 29 which are welded by adding two pieces of inner forefinger hands 29a having three teeth to the padding board 29b on the flat outer surface. ;

On the cylinder housing fixing shaft 30d installed on each of the fixed shaft bosses 26b provided on both sides of the two pincer fixing chassis 26 of the wood pick-up unit, hinged cylinder body housing 30b of the tongs cylinder 30 is installed. The cylinder rod housing 30a is hinged to the cylinder rod fixing shaft 30e mounted on the cylinder rod fixing bracket 30c welded across the bottom curved portion of each of the outer claws 28 and the inner claws 29. Forceps claw operation unit 300;

The Shibel joint shaft 25 for inputting and outputting hydraulic oil provided from the fork-lane to the claw cylinder 30 of the claw moving unit 300 through the pivot shaft has a head fixing bolt hole 25a formed at the top end thereof. The upper jaw 25b is formed, the hydraulic input hole 25c on the outer periphery of the upper jaw, the fixed gear stepped portion 25d on the lower outer periphery of the upper jaw, and the key groove 25e and A pivot shaft portion 400 having a hydraulic output hole 25f formed at both outer peripheries of the tongs fixed top end jaw portion 25h, and a lower end surface of the hydraulic output hole 25f;

The chisel joint shaft boss 24a having a central opening is integrally welded to the outer periphery of the lower housing 100 in the center of the tongs fixed top plate 24, and the shibel joint shaft 25 is inserted into the opening to clamp the tongs fixed top. After assembling the gear case 17 on the rectangular box having an opening fitted in the outer periphery of the sieve joint shaft boss 24a supported by the judgment jaw 25h at the bottom of the clamp pinned top plate 24, the gear case 17 A hydraulic motor 16 for driving the lid and the hydraulic motor gear shaft 20a of the) is installed, and a shibel joint outer case 12 assembled with the upper end of the shibel joint shaft 25 is welded to one side of the hydraulic motor. To the top of the shibel joint outer case, the fork-lane connecting piece 10 is composed of the upper housing 500 bolted to the gear cover cover 13, which is integrally coupled to the fork-lane connecting top plate 11.

 The shibel joint shaft 25 installed on the shibel joint shaft boss 24a in the gear case 17 of the upper housing has a shibel joint such that the fixed gear stepped portion 25d is integrally supported by the shibel joint shaft boss 24a. The shibel joint fixing gear (18) fitted to the outer circumference of the shaft is integrally bolted onto the shibel joint shaft boss (24a), and then bushing (19) in the middle of the shibel joint shaft (25) on the shibel joint fixing gear (18). And the reduction gear shaft 22a up and down with the reduction gear bearing 23a such that the second reduction gear 22 and the first reduction gear 21, which are uniaxially engaged, are engaged with the shibel joint fixed gear 18. The hydraulic motor gear shaft 20a, which is supported and supported by the hydraulic motor shaft bearing 20b, is installed so that the hydraulic motor gear 20 is engaged with the second reduction gear 22.

On the other hand, the inner circumferential portion of the inner side of the shibel joint outer case 12 assembled with the upper end of the shibel joint shaft 25 installed in the gear case 17, the shibel joint shaft bearing 15b mounted to the bushing 19; In the shaft hole of the fork-lane connecting top plate 11 welded to the upper side of the shibel joint case 12, the shibel joint shaft bearing 15a assembled to the upper jaw 25b of the shibel joint shaft 25 is internally installed, and the shibel joint shaft ( 25) the shibel joint head fixing plate (14) supported by the inner ring frame of the shibel joint shaft bearing (15a) by the shibel joint head fixing bolt (14a) so that the pivoting motion is smooth without falling into the inner periphery of the shibel joint outer case (12). It is to be fastened to the Sebel joint head fixing bolt ball (25a).

In the figure, reference numeral '12a' is an oil ring 12a installed at the inner circumference of the shibel joint outer case, and '17a' is a bottom opening of the gear case 17 fitted to the outer edge of the shibel joint shaft boss 24a. The oil packing (17a) is installed in.

One embodiment of the present invention configured as described above is as follows.

In the present invention, the tongs fixed top plate 24 of the lower housing 100 according to the hydraulic wood clamp structure was reduced by cutting each corner with an arc for weight loss, and tongs fixed chassis 26 and tongs fixed outside Bracket 27 was also to reduce the weight by cutting each lower corner and the upper middle piece to reduce.

On the other hand, the wood collecting portion 200 hinged to the lower housing 100 in the heavy lifting body to prevent twisting phenomenon and local abrasion with a wide traction force due to frequent hinge shaft rotation operation, the upper side of the outer claw (28) An outer claw erection gear 28a having three teeth added to the medial side; The upper hinge hinge portion of each of the upper hinge hinge portions consisting of two inner forefinger hands (29a) having three teeth on the padding plate (29b) and welded to each side of the pad (29b) on the flat outer surface of each other And durability of local wear according to the expansion and contraction, and frequent breakage of the engagement by the conventional spur gears at the upper end portions of both of the tongs rotation shafts has an external tongs gear hand (28a) having three teeth; The other upper part of the tongs rotation shaft is attached to the padding board 29b on the flat outer surface, and two pieces of inner forefinger hands 29a having three teeth are welded to each other. In the gripped body opening operation, the hydraulic force blocks backlash due to the backflow to expand the stability and to extend the durability.

In addition, one end of the tongs rotating shaft 31 fitted between the tongs fixed chassis 26 and the tongs fixed outer bracket 27 formed on both inner sides of the bottom of the tongs fixed top plate 24 are not turned by the tongs rotating shaft stopper 31b. The other one end of the shaft is fixed tab bushing stepped end portion 31 'by using the fixed tab bushing 31a so that the hinge shaft can be installed closely without assembly and left and right clearance.

In this hinge shaft assembly method, the cylinder rod is fixed in the fixed tap bushing 30d in which the cylinder rod fixing shaft 30e assembled by the cylinder rod housing 30a assembled to the cylinder rod fixing bracket 20c is also welded to the tongs side plate. Installation of the shaft 30e also facilitated assembly.

On the other hand, the upper both sides of each clamp claw welded to the upper end of the cylinder rod fixing bracket (30c) and welded to the claw plate (28b) to enhance durability, the curved bottom is connected to the cylinder rod fixing bracket (30c) outside the sieve Reinforced welding of the tongs plate 28c to the upper end of the hinge shaft except for the tongs hand 28a or the inner toe gears 29a to strengthen the durability due to warpage or expansion of the tongs cylinder 30, Of course, the picking operation according to the shaft, or tongs or digging the roots of the flood site, tongs and fork used to be durable.

In addition, the pivot shaft 400 according to the present invention is the lower end portion of the Shibel joint shaft 25 for inputting and outputting hydraulic oil to the tongs cylinder 30 of the tongs operation unit 300 hinged assembled to the tongs fixed top plate 24 A tongs fixed top plate stepped portion 25h supported by the bottom of the tongs fixed top plate 24; Shibel joint fixing gear 18, bushing 19, and bushing on bushing at the same time to crimp and support the fixed gear step 25d provided at the same height as the shibel joint shaft boss 24a welded to the tong fixing plate 24 Shibel joint shaft bearing 15a axially coupled to the inner circumference of the joint case 12, and the shibel joint shaft bearing 15a axially coupled to the hollow portion of the fork-lane connecting top plate 11 welded to the upper end of the shibel joint case 12. The lower housing is secured by a structure in which the Siebel joint head fixing plate 14 is firmly coupled to the Siebel joint shaft 25 by the Siebel joint head fixing bolt 14a so as to be supported by the swinging motion and the seating room seated on the inner ring of the Reinforced pivot system and fork-lane connection piece (10) for absorbing the impact of the weight and work received directly below the pivot shaft part 400 by the weight of itself and the weight of wood or rock To pivot shaft 400 from To output means to provide a smooth hydraulic fluid.

In addition, there is a small hydraulic motor 16 in the gear case 17 of the upper housing 500 in which the fork-lane connecting piece 10 is assembled with the fork-lane connecting top plate 11 which is integrally bolted together. In order to improve the torque force on the pivot shaft portion 400, the shibel joint shaft key (25g) is bolted onto the shibel joint shaft boss 24a and embedded in the key groove 25e formed on the shibel joint shaft 25. The reduction gear shaft 22a is not damaged by the reduction gear bearing 23a so that the second reduction gear 22 and the first reduction gear 21, which are uniaxially engaged, are provided on the Shibel joint fixed gear 18 which is axially coupled to the shaft. By the hydraulic motor gear shaft 20a not supported by the hydraulic motor shaft bearing 20b so that the hydraulic motor gear 20 is engaged with the second reduction gear 22, it is pivoted at a reduction ratio of 7.1: 1. The standard 310cc hydraulic motor has been reduced to 200cc for improved weight and manufacturing cost. It is a useful design.

1 is a perspective view of the present invention;

Figure 2 is a longitudinal cross-sectional view of the swivel joint (swivel joint) of the head rotation axis of the present invention

Figure 3 is an exploded perspective view of the headbelt joint part of the present invention

4 is an exploded perspective view of the claw portion of the present invention

[Description of Drawings]

10: Forkraine connecting piece 11: Forklift connecting plate

12: Sebel joint outer case 13: Gear case top cover

14: Siebel joint head fixing plate 14a: Siebel joint head fixing bolt

15a; 15b: Siebel joint shaft bearing 16: Hydraulic motor

17: Gear case 17a: Oil packing

18: Siebel joint fixed gear 19: Bushing

20: hydraulic motor gear 20a: hydraulic motor gear shaft

20b: Hydraulic motor shaft bearing 21: First reduction gear

22: 2nd reduction gear 22a: reduction gear shaft

23a; 23b: Reduction gear bearing 24: Clamp pin fixed top plate

24a: Shibel joint shaft boss 24b: Oil injection hole

25: Shibel joint shaft

25a: Sebel joint head fixing bolt ball 25b: Upper jaw

25c: Hydraulic input hole 25d: Fixed gear step

25e: Keyway 25f: Hydraulic output hole

25 g: Siebel joint shaft height 25 h: Nippers

25i: Oil drain plug 25j: Nipper action hydraulic hose

26: clamp pin sash 26a: clamp pin rotating shaft pipe

26b: Fixed shaft boss 27: Clamping foot fixed outer bracket

28: External claw 28a: Cylinder rod fixing bracket

28b: tongs plate 28c: tongs plate

29: Inner tongs 29a: Inner tongs

29b: Padded board

30: cylinder rod housing 30a: cylinder rod housing

30b: cylinder housing 30c: cylinder rod fixing bracket

30d; 31a: Fixed tap bushing 30e: Cylinder rod fixed shaft

31: Tongs rotating shaft 31 ': Fixed tapped bushing

31b: Clamp rotator shaft stopper

Claims (3)

In order to reduce the weight, each of the corners of the tongs fixed upper plate 24 on the rectangular plate body cut in an arc is fixed to the tongs fixing chassis 26 on both sides of the inner side in the longitudinal direction, but the pipe chain to the inner center of the tongs fixing chassis Welding installation to penetrate the two tongs rotary shaft pipe (26a), and through the inner side of the short pipe chain fixed shaft boss (26b) through each of the protrusions than the tongs rotary shaft pipe to protrude and weld, the tongs fixed plate (24) A lower housing (100) welded to the clamping foot fixing outer bracket (27) in which the tongs rotating shaft hole (27a) is drilled at both sides in the longitudinally downward outer border; The two tongs fixed shaft 26, which is fixed to both sides by the tongs rotary shaft pipe 26a, and the two tongs rotary shaft 31 penetrating the tongs fixed outer bracket 27, each of which is curved inwardly when the tongs are bitten up. Close contact and both sides are operated at the same opening and closing angle; One upper end portion of the tongs rotation shaft is disposed outside the claws 28, the outer claw gear hands 28a having three teeth added to the inner surface; The wooden pick-up part 200 and the other upper part of the tongs rotation shaft are hinged to the inner claws 29 which are welded by adding two pieces of inner forefinger hands 29a having three teeth to the padding board 29b on the flat outer surface. ; On the cylinder housing fixing shaft 30d installed on each of the fixed shaft bosses 26b provided on both sides of the two pincer fixing chassis 26 of the wood pick-up unit, hinged cylinder body housing 30b of the tongs cylinder 30 is installed. The cylinder rod housing 30a is hinged to the cylinder rod fixing shaft 30e mounted on the cylinder rod fixing bracket 30c welded across the bottom curved portion of each of the outer claws 28 and the inner claws 29. Forceps claw operation unit 300; The Shibel joint shaft 25 for inputting and outputting hydraulic oil provided from the fork-lane to the claw cylinder 30 of the claw moving unit 300 through the pivot shaft has a head fixing bolt hole 25a formed at the top end thereof. The upper jaw 25b is formed, the hydraulic input hole 25c on the outer periphery of the upper jaw, the fixed gear stepped portion 25d on the lower outer periphery of the upper jaw, and the key groove 25e and A pivot shaft portion 400 having a hydraulic output hole 25f formed at both outer peripheries of the tongs fixed top end jaw portion 25h, and a lower end surface of the hydraulic output hole 25f; The chisel joint shaft boss 24a having a central opening is integrally welded to the outer periphery of the lower housing 100 in the center of the tongs fixed top plate 24, and the shibel joint shaft 25 is inserted into the opening to clamp the tongs fixed top. After assembling the gear case 17 on the rectangular box having an opening fitted in the outer periphery of the sieve joint shaft boss 24a supported by the judgment jaw 25h at the bottom of the clamp pinned top plate 24, the gear case 17 A hydraulic motor 16 for driving the lid and the hydraulic motor gear shaft 20a of the) is installed, and a shibel joint outer case 12 assembled with the upper end of the shibel joint shaft 25 is welded to one side of the hydraulic motor. To the top of the shibel joint case, the hydraulic wood, characterized in that the fork-lane connecting piece 10 is assembled with a fork-lane connecting top plate 11 is integrally coupled to the gear housing cover 13 is bolt-assembled upper housing (500) Clamp structure. The shibel joint shaft 25 provided on the shibel joint shaft boss 24a in the gear case 17 of the upper housing has a fixed gear step 25d integrally with the shibel joint shaft boss 24a. The shibel joint fixing gear (18) inserted into the outer circumference of the shibel joint shaft (18) is integrally bolted onto the shibel joint shaft boss (24a), and then the shibel joint shaft (25) on the shibel joint fixing gear (18) is intermediate. The bushing 19 is fitted to the reduction gear shaft 22a such that the second reduction gear 22 and the first reduction gear 21, which are uniaxially coupled to the shibel joint fixed gear 18, are engaged with each other. The hydraulic motor gear shaft 20a, which is supported by the hydraulic motor shaft bearing 20b, is installed so that the upper and lower sides are supported by 23a, and the hydraulic motor gear 20 is engaged with the second reduction gear 22. Hydraulic wooden clamp structure. According to claim 1, wherein the inner circumferential portion of the outer side of the shibel joint shaft 12 assembled to the upper end of the shibel joint shaft 25 installed in the gear case 17, the shibel joint shaft bearing (15b) mounted to the bushing (19) ; In the shaft hole of the fork-lane connecting top plate 11 welded to the upper side of the shibel joint case 12, the shibel joint shaft bearing 15a assembled to the upper jaw 25b of the shibel joint shaft 25 is internally installed, and the shibel joint shaft ( 25) the shibel joint head fixing plate (14) supported by the inner ring frame of the shibel joint shaft bearing (15a) by the shibel joint head fixing bolt (14a) so that the pivoting motion is smooth without falling into the inner periphery of the shibel joint outer case (12). Hydraulic neck clamp structure, characterized in that the fastening to the Sebel joint head fixing bolt ball (25a).

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