CN113878381A

CN113878381A - Bottom suspension type supported clamp for machining oil cylinder rod head

Info

Publication number: CN113878381A
Application number: CN202111253026.3A
Authority: CN
Inventors: 谭宇岐; 铁钟; 杨龙
Original assignee: CHANGDE JIAHONG MACHINERY CO LTD
Current assignee: CHANGDE JIAHONG MACHINERY CO LTD
Priority date: 2021-10-27
Filing date: 2021-10-27
Publication date: 2022-01-04

Abstract

The invention relates to the technical field of oil cylinder rod head clamps, in particular to a clamp for machining an oil cylinder rod head with a suspended support at the bottom. The rotary clamping device comprises a supporting plate, a through hole is formed in the center of the supporting plate, lug plates are arranged on two sides of the supporting plate, rotating shafts are arranged on two sides of a connecting plate and rotatably connected to the lug plates, a first motor is arranged outside the lug plates and coaxially connected with the rotating shafts, a guide groove is formed in an annular block and is of a U-shaped structure, a bottom plate is arranged below the supporting plate, the guide groove is formed above the bottom plate, the annular block is fixed on the guide groove, a plurality of slide bars are symmetrically arranged on the side surface of the supporting plate, the slide bars are slidably connected in the guide groove, the rotary clamping device can move along the guide groove to complete overturning, the front surface of a workpiece faces upwards, then a drill bit can process the workpiece through the through hole, a round hole and a processing hole, and the quantity of the end faces capable of being processed in single clamping is increased to four.

Description

Bottom suspension type supported clamp for machining oil cylinder rod head

Technical Field

The invention relates to the technical field of oil cylinder rod head clamps, in particular to a clamp for machining an oil cylinder rod head with a suspended support at the bottom.

Background

In the oil cylinder rod head drilling process route, a numerical control lathe uses a four-jaw chuck to fix a workpiece, the end face positioning circle center is used, four rods are attached to four faces of an oil cylinder rod head to fix the workpiece, clamping is needed once again when each face is machined in the using process, and the clamp is extremely troublesome.

Disclosure of Invention

The invention aims to provide a clamp for machining an oil cylinder rod head with a suspended-type support at the bottom, which aims to solve the problem that the existing clamp for machining the oil cylinder rod head in the background comprises a rotatable clamp, a plurality of end faces can be clamped and machined at one time by rotating and adjusting the face orientation of the oil cylinder rod head, but the mode does not support overturning, generally only three faces except for fixing faces at two sides can be machined, and in the case of drilling the bottom face, an additional clamping operation is needed, so that the clamp is troublesome.

In order to achieve the above object, a bottom suspended support clamp for machining a cylinder rod head is provided, which comprises a clamping device and a turnover device installed on the clamping device, wherein the clamping device at least comprises:

the rotary drill bit guide device comprises a connecting plate, a rotary column, a sinking groove and a plurality of machining holes, wherein a round hole is formed in the center of the connecting plate, a fixing plate is arranged above the connecting plate, the rotary column is arranged below the fixing plate and is rotatably connected in the round hole, the sinking groove is formed above the fixing plate and is used for accommodating a base of a rod head of an oil cylinder, and the sinking groove is provided with a plurality of machining holes for guiding a drill bit;

the clamping plate is provided with a sliding block below, a sliding groove is formed above the connecting plate, the sliding block is connected in the sliding groove in a sliding mode, a rotating oil cylinder is arranged on the side face of the clamping plate, and a pressing plate is arranged above the rotating oil cylinder and used for clamping a workpiece;

the center of the supporting plate is provided with a through hole, two sides of the supporting plate are provided with lug plates, two sides of the connecting plate are provided with rotating shafts, the rotating shafts are rotatably connected to the lug plates, a first motor is arranged outside the lug plates, and the first motor is coaxially connected with the rotating shafts;

the turnover device comprises an annular block, wherein a guide groove is formed in the annular block, the guide groove is of a U-shaped structure, a bottom plate is arranged below the supporting plate, the guide groove is formed in the upper portion of the bottom plate, the annular block is fixed on the guide groove, a plurality of sliding rods are symmetrically arranged on the side face of the supporting plate, and the sliding rods are connected in the guide groove in a sliding mode.

Clamping device and turning device are when using, place the work piece in the fixed plate top, heavy groove through seting up on the fixed plate carries out tentatively spacing to the work piece, can adjust the orientation of work piece through rotating the fixed plate this moment, then promote splint until laminating with the work piece both sides, then drive the clamp plate through rotatory hydro-cylinder and descend and carry out the centre gripping to work piece top peripheral position, thoroughly fixed convenient drilling, when needs process all the other planes, it makes other terminal surfaces up to drive the connecting plate rotation through first motor, thereby realize the purpose of the three terminal surface of centre gripping processing, it is further, guide through the guiding groove, the slide bar removes along the second bull stick, remove the top from the below, and accomplish the upset, the drill bit can be through the perforation this moment, the work piece is processed to round hole and process pore pair.

As a further improvement of the technical scheme, one side the slide bar includes two at least, the front side be connected with the haulage rope on the slide bar, the rear side be connected with haulage rope down on the slide bar, go up the haulage rope and all pass with lower haulage rope the annular piece, the bottom plate top is equipped with the mounting panel, it is connected with first bull stick and second bull stick to rotate on the mounting panel, first bull stick and first bull stick both ends all are connected with the wire reel, go up the haulage rope and connect one respectively with lower haulage rope on the wire reel.

As a further improvement of the technical scheme, a first gear is arranged on the first rotating rod, a second gear is arranged on the second rotating rod, a third gear is arranged above the second gear, a second motor is coaxially connected to the side surface of the third gear, the second motor is fixed on the mounting plate, the first gear is meshed with the second gear, and the second gear is meshed with the third gear.

As a further improvement of the technical scheme, a connecting block is arranged behind the annular block, the tail end of the connecting block is rotatably connected with a pulley, and the pulley is positioned below the upper traction rope and used for guiding the upper traction rope to slide.

As a further improvement of the technical scheme, a plurality of wheel grooves are formed in the inner side of the annular block and are sunken inwards, a plurality of rollers are connected to the sliding rod in a rotating mode, and the wheel grooves are used for guiding the movement of the rollers.

As a further improvement of the technical scheme, a plurality of supporting cylinders are arranged above the supporting plate, supporting heads are arranged above the supporting cylinders, and the supporting cylinders and the supporting heads are symmetrically arranged on two sides of the workpiece.

As a further improvement of the technical scheme, the clamping plate is of a molded structure, the tail end of the clamping plate is provided with an air cylinder, the air cylinder is fixed on the connecting plate, and the air cylinder is used for pushing the clamping plate to move.

As a further improvement of the technical scheme, a sliding groove is formed in the supporting plate, a sliding block is connected to the sliding groove in a sliding mode, a supporting cylinder and a supporting head are arranged on the sliding block, and the sliding groove is formed in the lower portion of the workpiece.

As a further improvement of the technical scheme, a drill bushing is arranged in the processing hole and comprises a fixing ring, a plurality of bolts are arranged on the fixing ring, and the drill bushing is fixed to the bottom of the fixing plate through the bolts.

As a further improvement of the technical scheme, a rotary ring is arranged on the side face of the rotary column, an annular groove is formed in the inner side of the round hole, and the rotary ring is rotatably connected in the annular groove.

Compared with the prior art, the invention has the beneficial effects that:

1. during this hydro-cylinder pole head processing anchor clamps that bottom suspension formula supported, the rotatable connecting plate that drives through the setting overturns, and the fixture on cooperation two sides makes the single centre gripping in-process can carry out trilateral processing, and the fixed plate that is used for fixed work piece simultaneously can rotate, avoids fixing the work piece again many times, promotes machining efficiency.

2. During this hydro-cylinder pole head processing anchor clamps that bottom suspension formula supported, remove along the guiding groove through the backup pad that sets up and accomplish the upset for the work piece openly faces the reverse side up, then the drill bit can be processed the work piece through perforation, round hole and process hole, promotes the workable terminal surface quantity of single centre gripping to four.

3. In the clamp for machining the oil cylinder rod head with the suspended support at the bottom, the two sliding rods are pulled through the upper traction rope and the lower traction rope which are arranged, and the purpose of automatically controlling the position of the support plate is realized by matching the gear meshing mechanism, so that the operation flow is reduced.

4. During this hydro-cylinder pole head processing anchor clamps that bottom suspension formula supported, make the backup pad drive the work piece upset through the guiding groove that sets up, the guiding groove top is horizontal cell body, and fixed effect is better, avoids the upset production under the motor control to rock, promotes the machining precision.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is a schematic diagram of the present invention with the overall structure broken away;

FIG. 4 is a schematic exploded view of the support plate structure of the present invention;

FIG. 5 is a schematic view of a disassembled structure of the connection plate of the present invention;

FIG. 6 is a schematic view of a fixing plate according to the present invention;

FIG. 7 is a schematic cross-sectional view of a fixing plate according to the present invention;

FIG. 8 is a schematic view of the ring block configuration of the present invention;

FIG. 9 is a schematic cross-sectional view of a ring block of the present invention;

fig. 10 is a schematic exploded view of the driving structure of the present invention.

The various reference numbers in the figures mean:

100. a clamping device; 101. a workpiece; 102. a base plate;

110. a support plate; 111. an ear plate; 112. a chute; 113. a slider; 114. a support cylinder; 115. a support head; 116. perforating; 117. a slide bar; 118. a roller;

120. a splint; 121. rotating the oil cylinder; 122. pressing a plate; 123. a cylinder; 124. a slider;

130. a fixing plate; 131. sinking a groove; 132. machining a hole; 133. drilling a sleeve; 134. rotating the ring; 135. turning the column;

140. a connecting plate; 141. a sliding groove; 142. a rotating shaft; 143. a first motor; 144. a ring groove; 145. a circular hole;

200. a turning device;

210. a ring block; 211. a guide groove; 212. a wheel groove;

220. a first rotating lever; 221. a second rotating rod; 222. a first gear; 223. a second gear; 224. a third gear; 225. a second motor; 226. mounting a plate; 227. a wire spool;

230. connecting blocks; 231. a pulley;

240. an upper hauling rope; 241. and (6) a lower hauling rope.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Example 1

Referring to fig. 1 to 10, there is provided a clamp for processing a cylinder head with a suspended-bottom support, including a clamping device 100 and a turning device 200 installed on the clamping device 100, where the clamping device 100 at least includes:

a round hole 145 is formed in the center of the connecting plate 140, a fixing plate 130 is arranged above the connecting plate 140, a rotary column 135 is arranged below the fixing plate 130, the rotary column 135 is rotatably connected in the round hole 145, a sinking groove 131 is formed above the fixing plate 130 and used for accommodating a base of a rod head of the oil cylinder, and a plurality of processing holes 132 are formed in the sinking groove 131 and used for guiding a drill bit;

the clamping plate 120 is provided with a sliding block 124 below the clamping plate 120, a sliding groove 141 is formed above the connecting plate 140, the sliding block 124 is connected in the sliding groove 141 in a sliding mode, a rotary oil cylinder 121 is arranged on the side face of the clamping plate 120, preferably high-pressure type, and is used for improving compression precision, and a pressing plate 122 is arranged above the rotary oil cylinder 121 and is used for clamping the workpiece 101;

the center of the support plate 110 is provided with a through hole 116, two sides of the support plate 110 are provided with lug plates 111, two sides of the connecting plate 140 are provided with rotating shafts 142, the rotating shafts 142 are rotatably connected to the lug plates 111, a first motor 143 is arranged outside the lug plates 111, and the first motor 143 is coaxially connected with the rotating shafts 142;

the turnover device 200 comprises an annular block 210, a guide groove 211 is formed in the annular block 210, the guide groove 211 is of a U-shaped structure, a bottom plate 102 is arranged below the support plate 110, the guide groove 211 is formed above the bottom plate 102, the annular block 210 is fixed on the guide groove 211, a plurality of sliding rods 117 are symmetrically arranged on the side surface of the support plate 110, and the sliding rods 117 are slidably connected in the guide groove 211.

When the clamping device 100 and the turnover device 200 of the embodiment are used, the workpiece 101 is placed above the fixing plate 130, the workpiece 101 is primarily limited by the sinking groove 131 formed in the fixing plate 130, at this time, the orientation of the workpiece 101 can be adjusted by rotating the fixing plate 130, then the clamping plate 120 is pushed until the clamping plate is attached to two sides of the workpiece 101, then the rotary cylinder 121 drives the pressing plate 122 to descend and clamp the peripheral position above the workpiece 101, so as to completely fix and facilitate drilling, when other surfaces need to be processed, the first motor 143 drives the connecting plate 140 to rotate so that other end surfaces face upwards, thereby achieving the purpose of clamping and processing three end surfaces at one time, further, the slide rod 117 moves along the second rotating rod 221 by the guiding of the guiding groove 211, moves from below to above, and turnover is completed, at this time, the drill bit can process the workpiece through the through hole 116, the round hole 145 and the processing hole 132, the problem that the clamp needs to be replaced and clamped again when the bottom surface of the workpiece 101 is machined is solved.

In addition, in order to guide the movement of the sliding rod 117 in the guide groove 211 for replacement, one side sliding rod 117 comprises at least two sliding rods 117, the front side sliding rod 117 is connected with an upper pulling rope 240, the rear side sliding rod 117 is connected with a lower pulling rope 241, the upper pulling rope 240 and the lower pulling rope 241 both penetrate through the annular block 210, a mounting plate 226 is arranged above the bottom plate 102, the mounting plate 226 is rotatably connected with a first rotating rod 220 and a second rotating rod 221, both ends of the first rotating rod 220 and the first rotating rod 220 are connected with wire reels 227, the upper pulling rope 240 and the lower pulling rope 241 are respectively connected to one wire reel 227, the wire reels 227 are driven to rotate by rotating the first rotating rod 220 and the second rotating rod 221, so as to collect the upper pulling rope 240 and the lower pulling rope 241, the sliding rod 117 is pulled by the upper pulling rope 240 and the lower pulling rope 241, when the sliding rod 117 needs to be turned upwards, the second rotating rod 221 drives the upper pulling rope 240 to pull the sliding rod 117 to move, when the reset is needed, the first rotating rod 220 is rotated to drive the lower pulling rope 241 to pull the sliding rod 117 to move along the guiding groove 211.

Further, in order to realize automatic control, a first gear 222 is arranged on the first rotating rod 220, a second gear 223 is arranged on the second rotating rod 221, a third gear 224 is arranged above the second gear 223, a second motor 225 is coaxially connected to the side surface of the third gear 224, the second motor 225 is fixed on the mounting plate 226, the first gear 222 is meshed with the second gear 223, the second gear 223 is meshed with the third gear 224, and the first gear 222 is directly meshed with the second gear 223, so that the rotation directions of the first rotating rod 220 and the second rotating rod 221 are opposite all the time, and the sliding of the sliding rod 117 in the guide groove 211 can be controlled by the forward and reverse rotation of the second motor 225, so that automatic control is realized.

Still further, in order to guide the upper pulling rope 240 and prevent the upper pulling rope 240 from winding, a connecting block 230 is arranged behind the annular block 210, a pulley 231 is rotatably connected to the tail end of the connecting block 230, the pulley 231 is located below the upper pulling rope 240 and used for guiding the sliding of the upper pulling rope 240, the upper pulling rope 240 slides on the pulley 231, and the position of the upper pulling rope 240 is guided through the pulley 231 to prevent the winding.

Specifically, in order to promote the gliding fluency of slide bar 117, carry on spacingly simultaneously to slide bar 117, a plurality of race 212 have been seted up to annular piece 210 inboard, race 212 is inside sunken, it has a plurality of gyro wheels 118 to rotate on slide bar 117, race 212 is used for the removal of guide roller 118, the rolling through gyro wheel 118 in race 212 reduces the frictional force that slide bar 117 itself produced that slides, avoid blocking, race 212 is inside sunken simultaneously, cooperation roller 118 can carry on spacingly to slide bar 117, avoid taking place to rock or drop.

In addition, in order to further support the workpiece 101 and avoid the influence of shaking during machining on machining precision, a plurality of supporting cylinders 114 are arranged above the supporting plate 110, supporting heads 115 are arranged above the supporting cylinders 114, the supporting cylinders 114 and the supporting heads 115 are symmetrically arranged on two sides of the workpiece 101, the supporting cylinders 114 and the supporting heads 115 on the supporting plate 110 are used for supporting the workpiece 101 during rollover, and the bottom of the workpiece 101 after rollover is supported to avoid the shaking problem under the control of the first motor 143.

Further, for the slip of automatic control splint 120, splint 120 is the type structure, and the splint 120 tail end is equipped with cylinder 123, and cylinder 123 is fixed on connecting plate 140, and cylinder 123 is used for promoting the removal of splint 120, through the removal of cylinder 123 automated control splint 120, reduces manual operation's error, promotes the machining precision.

Still further, in order to support the workpiece 101, a sliding groove 112 is formed in the support plate 110, a sliding block 113 is connected to the sliding groove 112 in a sliding manner, a support cylinder 114 and a support head 115 are arranged on the sliding block 113, the sliding groove 112 is formed below the workpiece 101, and the support cylinder 114 and the support head 115 on the sliding block 113 are used for supporting the support plate 110 in a horizontal state, so that shaking is avoided.

In addition, in order to further guide the drill, avoid the drill to cause the injury to anchor clamps, be equipped with drill bushing 133 in the processing hole 132, drill bushing 133 includes solid fixed ring, is equipped with a plurality of bolts on the solid fixed ring, and drill bushing 133 passes through the bolt fastening in fixed plate 130 bottom, comes to carry out the accurate guide to the drill through drill bushing 133, avoids causing the injury to the anchor clamps body simultaneously.

In addition, in order to prevent the fixed plate 130 from falling off when rotating the fixed plate 130, the side surface of the rotary column 135 is provided with the rotary ring 134, the inner side of the round hole 145 is provided with the ring groove 144, the rotary ring 134 is rotatably connected in the ring groove 144, the rotary ring 134 is matched with the ring groove 144 in size and does not influence rotation, and the rotary column 135 is prevented from falling off by the vertical movement of the rotary column 135 left and right through clamping.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides an hydro-cylinder pole head processing of bottom suspension type support uses anchor clamps which characterized in that: comprises a clamping device (100) and a turnover device (200) arranged on the clamping device (100), wherein the clamping device (100) at least comprises:

the connecting plate (140), a round hole (145) is formed in the center of the connecting plate (140), a fixing plate (130) is arranged above the connecting plate (140), a rotary column (135) is arranged below the fixing plate (130), the rotary column (135) is rotatably connected in the round hole (145), a sinking groove (131) is formed above the fixing plate (130) and used for accommodating a base of the head of the oil cylinder rod, and a plurality of machining holes (132) are formed in the sinking groove (131) and used for guiding a drill bit;

the clamping plate (120) is provided with a sliding block (124) below the clamping plate (120), a sliding groove (141) is formed above the connecting plate (140), the sliding block (124) is connected in the sliding groove (141) in a sliding mode, a rotary oil cylinder (121) is arranged on the side face of the clamping plate (120), and a pressing plate (122) is arranged above the rotary oil cylinder (121) and used for clamping the workpiece (101);

the supporting plate (110), a through hole (116) is formed in the center of the supporting plate (110), lug plates (111) are arranged on two sides of the supporting plate (110), rotating shafts (142) are arranged on two sides of the connecting plate (140), the rotating shafts (142) are rotatably connected to the lug plates (111), a first motor (143) is arranged outside the lug plates (111), and the first motor (143) is coaxially connected with the rotating shafts (142);

turning device (200) are including annular piece (210), guide slot (211) have been seted up on annular piece (210), guide slot (211) are U type structure, backup pad (110) below is equipped with bottom plate (102), bottom plate (102) top is equipped with guide slot (211), annular piece (210) are fixed on guide slot (211), backup pad (110) side symmetry is equipped with a plurality of slide bars (117), slide bar (117) sliding connection be in guide slot (211).

2. The clamp for machining the head of the oil cylinder with the suspended-bottom support according to claim 1, wherein: one side slide bar (117) include two at least, the front side be connected with haulage rope (240) on slide bar (117), the rear side be connected with haulage rope (241) down on slide bar (117), go up haulage rope (240) and lower haulage rope (241) and all pass annular piece (210), bottom plate (102) top is equipped with mounting panel (226), it is connected with first bull stick (220) and second bull stick (221) to rotate on mounting panel (226), first bull stick (220) and first bull stick (220) both ends all are connected with wire reel (227), it connects one respectively with lower haulage rope (241) to go up haulage rope (240) on wire reel (227).

3. The clamp for machining the head of the oil cylinder supported in a suspended manner from the bottom according to claim 2, wherein: be equipped with first gear (222) on first bull stick (220), be equipped with second gear (223) on second bull stick (221), second gear (223) top is equipped with third gear (224), third gear (224) side coaxial coupling has second motor (225), second motor (225) are fixed on mounting panel (226), first gear (222) with second gear (223) meshing, second gear (223) with third gear (224) meshing.

4. The clamp for machining the head of the oil cylinder supported in a suspended manner from the bottom according to claim 2, wherein: the rear part of the annular block (210) is provided with a connecting block (230), the tail end of the connecting block (230) is rotatably connected with a pulley (231), and the pulley (231) is positioned below the upper traction rope (240) and used for guiding the sliding of the upper traction rope (240).

5. The clamp for machining the head of the oil cylinder with the suspended-bottom support according to claim 1, wherein: a plurality of wheel grooves (212) are formed in the inner side of the annular block (210), the wheel grooves (212) are recessed inwards, a plurality of rollers (118) are connected to the sliding rod (117) in a rotating mode, and the wheel grooves (212) are used for guiding the movement of the rollers (118).

6. The clamp for machining the head of the oil cylinder with the suspended-bottom support according to claim 1, wherein: a plurality of supporting cylinders (114) are arranged above the supporting plate (110), supporting heads (115) are arranged above the supporting cylinders (114), and the supporting cylinders (114) and the supporting heads (115) are symmetrically arranged on two sides of the workpiece (101).

7. The clamp for machining the head of the oil cylinder with the suspended-bottom support according to claim 1, wherein: the clamping plate (120) is of a molded structure, an air cylinder (123) is arranged at the tail end of the clamping plate (120), the air cylinder (123) is fixed on the connecting plate (140), and the air cylinder (123) is used for pushing the clamping plate (120) to move.

8. The clamp for machining the head of the oil cylinder with the suspended-bottom support according to claim 6, wherein: the workpiece support device is characterized in that a sliding groove (112) is formed in the support plate (110), a sliding block (113) is connected to the sliding groove (112) in a sliding mode, a support cylinder (114) and a support head (115) are arranged on the sliding block (113), and the sliding groove (112) is formed in the lower portion of the workpiece (101).

9. The clamp for machining the head of the oil cylinder with the suspended-bottom support according to claim 1, wherein: be equipped with drill bushing (133) in processing hole (132), drill bushing (133) are equipped with a plurality of bolts including solid fixed ring on the solid fixed ring, drill bushing (133) pass through the bolt fastening fixed plate (130) bottom.

10. The clamp for machining the head of the oil cylinder with the suspended-bottom support according to claim 1, wherein: the side of the rotary column (135) is provided with a rotary ring (134), the inner side of the round hole (145) is provided with a ring groove (144), and the rotary ring (134) is rotatably connected in the ring groove (144).