CN216543149U - Shearing and pressing pliers - Google Patents

Abstract

The utility model belongs to the technical field of hydraulic equipment, and particularly relates to a pair of shearing and pressing pliers. The hydraulic clamp comprises an oil cylinder device, a piston device and a clamp head device; the binding clip device includes: the clamp body is arranged at the front end of the piston cavity; the guide support is provided with a support main body and two guide arms arranged on the same side of the support main body, the guide arms are distributed in an up-and-down symmetrical mode, and the end parts of the guide arms are installed on the clamp body through positioning pins, so that a working space is formed between the guide support and the clamp body, and guide channels are formed in the upper side wall and the lower side wall of the working space; the movable die holder is movably arranged in the guide channel and is connected with a driving piston rod of the piston device; and the fixed die holder is arranged in the guide bracket and is matched with the movable die holder. The symmetrical design of the tong head device enables the clamping force during working to be more symmetrical and stable, and is beneficial to improving the working effect during shearing or pressing the pipe. In addition, the design of the guide channel can ensure the accurate movement of the movable die holder, and further improve the working accuracy.

Description

Shearing and pressing pliers

Technical Field

The utility model belongs to the technical field of hydraulic equipment, and particularly relates to a pair of shearing and pressing pliers.

Background

Application number is 201621271481.0's utility model discloses a manual hydraulic pressure formula pressure breakout tongs, its tong head portion includes the die holder of setting in the tong head main part with tong head main part integrated into one piece's upper die base and activity, though be provided with the guide between the upper end of tong head main part and die holder, the lower extreme is the open-ended, when the die holder removes to press from both sides tightly, the clamp force of going up the lower extreme produces the deviation easily, the condition that one end was too tight relatively appears when leading to pressing the pipe, the other end is too loose relatively, the effect of pressing the pipe is pressed in the influence. In addition, because the upper die base is integrally formed, the pipe pressing pliers are difficult to realize other functions, so that the performance of the tool is single, and the utilization rate is low.

Disclosure of Invention

The utility model aims to provide the shearing and pressing pliers which are simple in structure, high in precision, high in power, high in efficiency, small in vibration and low in noise.

The purpose of the utility model is realized as follows:

a pair of shearing pliers comprising:

the oil cylinder device comprises a cylinder body, wherein the front end of the cylinder body is provided with a piston cavity;

the piston device comprises a driving piston rod and a driving piston, and is arranged in the piston cavity; and

the tong head device is arranged at the front end of the cylinder body;

wherein, binding clip device includes:

the clamp body is arranged at the front end of the piston cavity;

the guide support is provided with a support main body and two guide arms arranged on the same side of the support main body, the guide arms are distributed in an up-and-down symmetrical mode, the end parts of the guide arms are installed on the forceps body through positioning pins, so that a working space is formed between the guide support and the forceps body, and guide channels are formed in the upper side wall and the lower side wall of the working space;

the movable die holder is movably arranged in the guide channel and is connected with a driving piston rod of the piston device;

and the fixed die holder is arranged in the guide bracket and is matched with the movable die holder.

Preferably, the movable die holder and the fixed die holder are press pipe dies or trimming dies.

Preferably, the guide channel is provided with a first guide groove formed on the guide arm and the forceps body and a second guide groove formed on the groove wall of the first guide groove;

the upper side and the lower side of the movable die holder are provided with a first guide part matched with the first guide groove and a second guide part matched with the second guide groove.

Preferably, the end of the guide arm is provided with a positioning groove, the forceps body is provided with a positioning protrusion which is matched with the positioning groove, and the positioning protrusion and the positioning groove are fixed with each other through the positioning pin.

Preferably, an oil bag device for storing oil is installed at the rear end of the cylinder body;

the cylinder body is also provided with an oil inlet channel and a pressure relief channel which are respectively communicated with the piston cavity and the oil bag device; the oil inlet channel is provided with a pump cavity, and an oil pump assembly is arranged in the pump cavity; the liquid inlet end and the liquid outlet end of the pump cavity are respectively provided with an oil inlet one-way valve and an oil outlet one-way valve;

oil feed check valve and oil outlet check valve all include:

the valve body at least comprises an oil inlet hole, a valve core mounting cavity and an oil outlet hole which are sequentially communicated with the oil inlet channel;

the valve core is movably arranged in the valve core mounting cavity and used for sealing or conducting the oil inlet hole; and

a reset member installed between the valve core and the valve main body;

wherein the spool further has:

the guide part is formed on the side wall of the valve core, is arranged on the inner wall of the valve core mounting cavity and is used for guiding; and

and the channel part is formed between the two adjacent guide parts and is used for communicating the oil inlet hole and the oil outlet hole.

Preferably, the guide portion and the channel portion are spiral-shaped and are uniformly arranged on the periphery of the side wall of the valve core.

Preferably, the outer side of the cylinder body where the piston cavity is located is uniformly and respectively provided with a plurality of reinforcing grooves or reinforcing raised lines.

Preferably, a driving device is arranged on the cylinder body at the outer end of the oil pump assembly, and the driving device comprises:

the motor support is fixed on the cylinder body where the pump cavity is located and is provided with a cam cavity and a speed reduction cavity;

the driving motor is arranged at the outer end of the motor support;

the speed reducer is arranged in the speed reducing cavity and is connected with the output end of the driving motor; and

and the cam shaft is arranged in the cam cavity, is connected with the output end of the speed reducer and is used for driving the plunger to reciprocate.

Preferably, wherein the decelerator comprises:

the inner gear ring is mounted on the side wall of the speed reducing cavity; and

each gear bracket is provided with a planetary gear set which is arranged on the inner gear ring and is also meshed with the output end of the driving motor or the output end of the previous gear bracket;

wherein, the output end of the final stage gear bracket is connected with the camshaft.

Preferably, the camshaft comprises a first section, an eccentric section and a second section, wherein the first section and the second section are coaxially arranged and are respectively installed on the motor support through a first bearing; the eccentric section is eccentrically arranged between the first section and the second section; and a second bearing connected with the plunger is sleeved outside the eccentric section.

Compared with the prior art, the utility model has the outstanding and beneficial technical effects that:

1. the symmetrical design of the tong head device enables the clamping force during working to be more symmetrical and stable, and is beneficial to improving the working effect during shearing or pressing the pipe. In addition, the design of the guide channel can ensure the accurate movement of the movable die holder, and further improve the working accuracy.

2. The pipe pressing die or the wire shearing die can be selected according to requirements, and different scene requirements of users are met.

3. The one-way valve has the advantages of high oil inlet efficiency, high valve closing speed, capability of greatly improving the working efficiency of the shearing pliers, good sealing property, high durability, long service life and the like.

4. According to the check valve, the guide part and the channel part are arranged on the side wall of the valve core at intervals, and the guide function and the liquid passing function are realized at the same time, so that two purposes are achieved; in addition, the manufacturing cost is also reduced. In addition, the guide part and the channel part are in a spiral shape, when oil enters and exits, the high-pressure oil can drive the valve core to rotate, a pressurization effect is generated, and the oil entering and exiting efficiency is improved.

5. According to the utility model, the outer side of the cylinder body where the piston cavity is located is uniformly and respectively provided with the plurality of reinforcing grooves or reinforcing raised lines, so that on one hand, the strength of the cylinder body can be increased, and the phenomenon of bursting when the piston cavity is filled with oil is prevented; on the other hand, it can also increase heat radiating area, is favorable to prolonging the life of cylinder body.

6. The camshaft and the reducer are arranged on the same motor support, and then the driving motor is directly fixed on the cylinder body through the motor support, so that the transmission stability can be improved, and the vibration and the noise can be reduced; on the other hand, the mounting structure is simplified, and the mounting efficiency is improved.

Drawings

Fig. 1 is a schematic structural view of the shearing and pressing pliers of the utility model.

Fig. 2 is a schematic structural view of the binding clip device of the present invention.

Fig. 3 is a cross-sectional view of the jaw apparatus of the present invention.

Fig. 4 is a cross-sectional view at a-a in fig. 3.

Fig. 5 is a sectional view at B-B in fig. 3.

Fig. 6 is a sectional view of the cylinder device and the driving device of the present invention.

Fig. 7 is a schematic structural diagram of the oil inlet check valve of the utility model.

Fig. 8 is an exploded view of the oil feed check valve of the present invention.

Fig. 9 is a schematic structural view of the oil outlet check valve of the present invention.

Fig. 10 is an exploded view of the oil outlet check valve of the present invention.

Fig. 11 is a schematic structural view of a spiral valve cartridge of the present invention.

Fig. 12 is a perspective view of a second oil inlet check valve of the present invention.

Fig. 13 is a schematic structural diagram of a second oil inlet check valve of the utility model.

Fig. 14 is a schematic structural view of the cylinder of the present invention.

Fig. 15 is a schematic view of the internal structure of the cylinder of the present invention.

FIG. 16 is a schematic view of the drive assembly of FIG. 6 connected to an oil pump assembly at C-C.

Fig. 17 is a schematic structural view of the pressure release mechanism.

Fig. 18 is a partially enlarged view of the pressure relief mechanism at D in fig. 17.

The reference numerals in the figures denote the meanings:

1-an oil bag device; 2-oil cylinder device; 3-a drive device; 5-a piston device; 6-a binding clip device;

11-a valve body; 111-oil inlet holes; 112-a cartridge mounting cavity; 113-oil outlet holes; 114-an oil intake; 115-oil outlet; 116-snap-fit convex ring; 117-sealing convex ring; 118-oil outlet guide surface; 119-a limiting surface; 12-a valve core; 121-a guide; 122-a channel portion; 123-groove; 124-sealing surface; 125-oil inlet guide surface; 13-a reset piece; 14-a sealing ring; 15-a threaded portion; 16-a drive aperture;

21-cylinder body; 211-piston cavity; 212-an oil inlet channel; 213-pressure relief channel; 214-a pump chamber; 215-reinforcement groove; 216-a pressure relief cavity; 217-first pressure relief vent; 218-a second pressure relief vent; 22-an oil pump assembly; 221-a plunger; 222-a plunger sleeve; 223-a low pressure piston; 2231-an overflowing hole; 224-piston columns; 2241-connecting the projection; 225-oil pump spring; 226-spring washers; 227-oil pump seal ring; 23-an oil inlet check valve; 24-an oil outlet one-way valve;

31-a motor support; 311-cam cavity; 312-a deceleration chamber; 32-a drive motor; 321-a heat dissipation fan; 33-a reducer; 331-ring gear; 332-a gear holder; 333-planetary gear set; 34-a camshaft; 341-first stage; 342-an eccentric section; 343-a second segment; 35-a first bearing; 36-a second bearing; 37-a fastener;

40-a pressure relief mechanism; 41-a pressure relief cover; 42-a pressure relief bar; 421-pressure relief handle; 43-pressure relief valve needle; 44-a pressure relief piston; 441-oil supplement holes; 45-pressure relief spring; 46-a pressure relief seat; 461-third pressure relief vent; 47-first pressure relief gasket; 48-pressure relief sealing ring; 49-a second pressure relief gasket;

50-a drive piston; 51-a drive piston rod;

60-a clamp body; 601-positioning protrusions; 61-a guide bracket; 611-a stent body; 612-a guide arm; 613-positioning grooves; 62-a locating pin; 63-a guide channel; 631 — a first guide groove; 632-a second guide groove; 64-moving die holder; 641-a first guide; 642-second guide; 65-a connecting seat; 66-locking screw.

Detailed Description

The utility model is further described below with reference to specific examples:

as shown in fig. 1, the shearing and pressing pliers comprise an oil bag device 1, an oil cylinder device 2, a driving device 3, a piston device 5 and a pliers head device 6.

The oil bag device 1 comprises an oil bag and is mainly used for storing oil; the oil cylinder device 2 comprises a cylinder body 21 and an oil pump assembly 22 arranged inside the cylinder body 21; the driving device 3 is used for driving the oil pump assembly 22 to reciprocate. Wherein, the front end of the cylinder body 21 is provided with the binding clip device 6, and the rear end thereof is provided with the oil bag device 1.

As shown in fig. 6, the cylinder block 21 has a piston chamber 211 for mounting the piston device 5, and an oil inlet passage 212 and a pressure relief passage 213 for respectively communicating the piston chamber 211 and the oil bag device 1.

The piston device 5 comprises a driving piston 50, a driving piston rod 51, a driving spring and a spring retainer ring, wherein the driving piston 50 is installed at the inner end of the driving piston rod 51, the spring retainer ring is installed at the outer end of the driving piston rod 51, and the driving spring is arranged between the driving piston 50 and the spring retainer ring.

A pump cavity 214 for mounting the oil pump assembly 22 is formed in the oil inlet passage 212, and an oil inlet check valve 23 and an oil outlet check valve 24 are respectively arranged at a liquid inlet end and a liquid outlet end of the pump cavity 214. The oil inlet one-way valve 23 is arranged at the bottom of the pump cavity 214 and close to one side of the oil bag device 1, and an oil inlet filter is arranged on the front side of the oil inlet one-way valve 23 and used for preventing impurities from entering. The oil outlet check valve 24 is disposed in the middle of the pump chamber 214 and near one side of the piston chamber.

The one-way valve has the advantages of high oil inlet efficiency, high valve closing speed, capability of greatly improving the working efficiency of the shearing pliers, good sealing property, high durability, long service life and the like.

[ plier head device ]

As shown in fig. 2 to 3, the binding clip device includes a clip body 60, a guide bracket 61, a movable die holder 64, and a fixed die holder.

The caliper body 60 is installed at the front end of the piston chamber 211.

The guide bracket 61 has a bracket main body 611 and two guide arms 612 arranged on the same side of the bracket main body 611, the guide arms 612 are distributed vertically and symmetrically, and the end parts of the guide arms are mounted on the forceps body 60 through the positioning pins 62, so that a working space is formed between the guide bracket 61 and the forceps body 60, and the upper and lower side walls of the working space are both provided with guide channels 63.

Specifically, the end of the guide arm 612 is opened with a positioning groove 613, the caliper body 60 has a positioning protrusion 601 fitted to the positioning groove 613, and the two are fixed to each other by the positioning pin 62. In order to prevent the positioning pin 62 from falling off, a locking screw 66 for fixing the positioning pin 62 is mounted on the guide arm 612.

The movable die holder 64 is movably arranged in the guide channel 63 and is connected with the driving piston rod 51 of the piston device 5 through a connecting seat 65.

The fixed die holder is arranged in the guide bracket 61 and is matched with the movable die holder 64.

Preferably, the movable die holder 64 and the fixed die holder are pressure tube dies or trimming dies, so that the replacement is convenient, and the multi-scene use of a user is met.

As shown in fig. 4 to 5, in order to increase the accuracy of the guide, the guide passage 63 has a first guide groove 631 opened in the guide arm 612 and the caliper body 60 and a second guide groove 632 opened in a groove wall of the first guide groove 631, and the second guide groove 632 is smaller in width than the first guide groove 631 and is formed in a step shape. The upper and lower sides of the movable die holder 64 are provided with a first guide part 641 matching with the first guide groove 631 and a second guide part 642 matching with the second guide groove 632.

[ OIL-FEEDING ONE-WAY VALVE ]

First oil feed check valve embodiment:

as shown in fig. 7 to 8, an oil feed check valve 23 includes a valve main body 11, a spool 12, and a returning member 13.

The valve main body 11 comprises an oil inlet portion 114 with an oil inlet hole 111 and an oil outlet portion 115 with an oil outlet hole 113, a valve core mounting cavity 112 is formed in the oil outlet portion 115, a clamping convex ring 116 is formed on the oil inlet portion 114, and the oil outlet portion 115 is fixed on the clamping convex ring 116 and is mounted in a sealing mode.

The valve core 12 is movably installed in the valve core installation cavity 112, the reset piece 13 is installed between the valve core 12 and the valve main body 11, and the valve core 12 seals or conducts the oil inlet hole 111 through the reset piece 13 to realize the function of one-way conduction. The return element 13 is preferably a spring.

Specifically, a sealing surface 124 is formed at the front end of the valve core 12, a sealing convex ring 117 extends from the clamping convex ring 116 at the inner end of the oil inlet hole 111, the area of the sealing surface 124 is larger than that of the sealing convex ring 117, and the sealing surface 124 abuts against the sealing convex ring 117 under the action of a spring to realize surface sealing; when high-pressure oil enters, the valve core 12 is forced to move, the sealing surface 124 leaves the sealing convex ring 117, and the spring is compressed to realize oil inlet.

In order to better realize oil feeding and movement of the valve core 12, the side wall of the valve core 12 is provided with a guide portion 121 and a channel portion 122 at intervals, the outer dimension of the guide portion 121 is matched with the inner diameter of the valve core mounting cavity 112 and is mounted on the inner wall of the valve core mounting cavity 112, and when the valve core 12 moves, the guide portion 121 can play a role in guiding and positioning. The passage portion 122 is formed between two adjacent guide portions 121 for communicating the oil inlet hole 111 and the oil outlet hole 113.

In this embodiment, the guide portion 121 and the passage portion 122 are spiral and are uniformly arranged on the periphery of the side wall of the valve core 12, and when oil is fed, high-pressure oil drives the valve core 12 to rotate, which is equivalent to rotation of an impeller, and a pressurizing effect is generated, so that the oil feeding efficiency is improved. In addition, the rotating valve core 12 can automatically run in with the contact surface of the sealing convex ring 117, the sealing performance of the valve core and the sealing convex ring is further ensured, and meanwhile, the durability and the service life of the one-way valve can be increased.

The channel portion 122 has an arc-shaped cross-section in order to increase the sectional area of the oil path. In addition, the number of the guide portions 121 and the channel portions 122 is 3 to 8, preferably 6, respectively, in which case the overall performance is the best.

Preferably, a groove 123 for mounting the resetting member 13 is formed at the rear end of the valve core 12, the oil outlet 113 is opened at the center of the oil outlet portion 115, the groove 123 faces the oil outlet 113, and the inner diameter of the groove 123 is larger than that of the oil outlet 113. The structure is beneficial to the installation of the spring on one hand; another aspect is, in the moment that the check valve is closed, can produce the water hammer effect at oil outlet 113 department, and high-pressure oil can strike the rear end of case, and the rear end area is big more, and the reaction force of water hammer effect is more obvious, though the water hammer effect has certain destructiveness, can further shorten the seal time of case here, prevents the high-pressure oil backward flow, promotes check valve work efficiency. Meanwhile, the counterforce generated by the water hammer effect and the power of the rotation of the valve core can be mutually offset, so that the valve core is protected.

Preferably, a limiting surface 119 for limiting the maximum stroke of the valve element 12 is formed in the valve element mounting cavity 112, and the limiting surface 119 is formed in an inner cavity of the oil outlet portion 115.

In order to reduce the energy loss of high-pressure oil, an oil outlet guide surface 118 is formed at the inner end of the oil outlet hole 113, an oil inlet guide surface 125 is formed at the periphery of the sealing surface 124, and the oil outlet guide surface 118 and the oil inlet guide surface 125 are inclined surfaces or arc surfaces.

In this embodiment, a sealing groove is formed in the periphery of the connecting end of the valve main body 11, and a sealing ring 14 is installed in the sealing groove, that is, the sealing ring 14 is disposed on the end surface of the oil outlet portion 115 and is configured to contact the end surface and the sidewall at the same time. The fixed end of valve main body 11 is moulded to have screw thread portion 15, screw thread portion 15 promptly in oil feed portion 114, three drive hole or a polygon drive block that are used for installing assembly and disassembly tools have still been seted up to the outer terminal surface of oil feed portion 114, easy to assemble and fixed.

In this embodiment, the inner diameter of the oil inlet 111 is 1.8-2.2mm, preferably 2 mm; the inner diameter of the oil outlet 113 is 2.8-3.3mm, preferably 3 mm. When the inner diameter of the oil outlet hole exceeds 3.3mm, the oil outlet pressure fluctuation at the oil outlet hole is increased, so that the oil outlet pressure is unstable, and the oil return amount is easy to increase; when the inner diameter of the oil outlet hole is smaller than 2.8mm, the output force of the oil pump and the motor thereof can be increased, and the abrasion and the power loss of the motor are caused.

Oil feed check valve embodiment two:

as shown in fig. 12 to 13, the present embodiment refers in particular to an oil inlet check valve, the structure of the embodiment is substantially the same as that of the embodiment, and the difference is that the installation position of the sealing ring, specifically, an inclined surface is formed at the connection end of the valve main body 11, a sealing groove is formed on the inclined surface, and a sealing ring 14 is installed in the sealing groove. This can effectively prevent the looseness of the threaded portion 15, ensuring the reliability of the mounting position. In order to prevent the seal ring 14 from being pressed and dislocated, the angle between the inclined surface and the end surface of the valve body 11 is 120 degrees as shown in fig. 10. Meanwhile, the mounting structure of the sealing ring is suitable for other one-way valve embodiments.

[ OIL OUTLET ONE-WAY VALVE ]

As shown in fig. 9 to 10, this embodiment refers in particular to an oil outlet check valve, the structure of the embodiment of which is substantially the same as that of the oil inlet check valve, and the difference is that: the seal ring 14 is provided with an oil inlet portion 114, the threaded portion 15 is formed on the oil outlet portion 115, and three driving holes for installing tools are further formed in the outer end face of the oil outlet portion 115.

[ Cylinder Structure ]

As shown in fig. 14, a plurality of reinforcing grooves 215 or reinforcing ribs are uniformly formed on the outer side of the cylinder 21 where the piston cavity 211 is located. The structure can increase the strength of the cylinder body and prevent the piston cavity from bursting when oil is fed; on the other hand, it can also increase heat radiating area, is favorable to prolonging the life of cylinder body. The reinforcing grooves 215 are preferably uniformly distributed around the reinforcing grooves in the embodiment, so that compared with reinforcing convex strips, the material can be saved, and the product quality can be reduced.

As shown in fig. 15, the oil pump assembly 22 includes a plunger 221, a plunger sleeve 222, a low-pressure piston 223, a piston column 224 and an oil pump spring 225, the piston column 224, the low-pressure piston 223 and the plunger 221 are sequentially disposed in the pump chamber 214, the plunger sleeve 222 is sleeved outside the plunger 221, and the plunger sleeve 222 is fixed at the outer end of the pump chamber 214.

Wherein, the discharge hole 2231 has been seted up at low pressure piston 223 middle part, piston post 224 upper end extends has connecting protrusion 2241, connecting protrusion 2241 passes discharge hole 2231 and connects plunger 221, and forms the clearance of overflowing between connecting protrusion 2241 and discharge hole 2231 and the plunger 221, the clearance of overflowing is to the position that produces oil check valve 24 place.

Preferably, the pump chamber 214 is further provided with a spring washer 226, and one end of the oil spring 225 abuts against the spring washer 226, and the other end thereof abuts against the outer edge of the piston post 224.

Preferably, oil pump sealing rings 227 are arranged between the plunger 221 and the plunger sleeve 222 and between the plunger sleeve 222 and the pump cavity 214.

[ DRIVING DEVICE ]

As shown in fig. 6 and 16, the driving device 3 includes a motor support 31, a driving motor 32, a reducer 33, and a cam shaft 34.

The motor support 31 is fixed on the cylinder 21 where the pump cavity 214 is located through a left fastener and a right fastener 37, the motor support 31 is provided with a cam cavity 311 and a speed reducing cavity 312, and the cam cavity 311 faces the pump cavity 214.

The driving motor 32 is mounted on the motor support 31 at the outer end of the speed reducing chamber 312. The driving motor 32 is a brushless motor, and a heat dissipation fan 321 and heat dissipation holes are sleeved on the front side of a main shaft of the driving motor, so that heat dissipation and cooling of the brushless motor are facilitated.

The speed reducer 33 is installed in the speed reducing cavity 312, and the speed reducer 33 is connected to the output end of the driving motor 32.

The decelerator 33 includes an inner gear 331, at least one gear holder 332, and a planetary gear set 333. The inner gear ring 331 is mounted on a side wall of the reduction chamber 312; each gear support 332 is mounted with a planetary gear set 333, the planetary gear set 333 is mounted on the ring gear 331, and the planetary gear set 333 is also engaged with the output end of the driving motor 32 or the output end of the previous gear support 332 and forms a reduction structure of at least one stage.

In addition, the present embodiment is provided with two gear holders 332 and two sets of planetary gear sets 333, wherein the input end of the first set of planetary gear sets is connected with the input teeth of the driving motor 32, the output end of the first gear holder is connected with the input end of the second set of planetary gear sets, the output end of the second gear holder (final gear holder) is connected with the cam shaft 34, and the cam shaft 34 is installed in the cam cavity 311.

The camshaft 34 includes a first section 341, an eccentric section 342, and a second section 343, where the first section 341 and the second section 343 are coaxially disposed, and are respectively mounted on the motor support 31 through a first bearing 35; the eccentric section 342 is eccentrically disposed between the first section 341 and the second section 343, and a second bearing 36 connected to the plunger 221 is sleeved outside the eccentric section 342. Due to the action of the oil pump spring 225, the upper end of the plunger 221 of the oil pump assembly 22 is always abutted against the lower end of the second bearing 36. Therefore, the driving motor 32 rotates the cam shaft 34 through the reducer 33, and the plunger 221 can reciprocate up and down.

In this embodiment, the camshaft 34 and the reducer 33 are mounted on the same motor support 31, and then the driving motor is directly fixed on the cylinder body through the motor support 31, so that on one hand, the driving stability can be increased, on the other hand, the mounting structure is simplified, and the mounting efficiency is improved.

[ PRESSURE RELIEF MECHANISM ]

As shown in fig. 17, a pressure relief cavity 216 is formed in the pressure relief channel 213, a first pressure relief hole 217 communicating with the pressure relief channel 213 is formed in the bottom of the pressure relief cavity 216, and at least one second pressure relief hole 218 communicating with the oil bag device 1 is formed in the side wall of the pressure relief cavity; the pressure relief cavity 216 is internally provided with a pressure relief mechanism 40.

As shown in fig. 18, the pressure relief mechanism 40 includes a pressure relief cover 41, a pressure relief rod 42, a pressure relief needle 43, a pressure relief piston 44, a pressure relief spring 45, and a pressure relief seat 46.

The pressure relief cover 41 is fixed at the port of the pressure relief cavity 216, and a pressure relief rod mounting hole for mounting the pressure relief rod 42 is formed in the middle of the pressure relief cover 41. Specifically, the outer side of the pressure relief cover 41 is provided with an external thread and a pressure relief sealing ring 48, the outer end of the pressure relief cavity 216 is provided with an internal thread, and the two threads are connected. In order to facilitate the thread fixation, the outer surface of the pressure relief cover 41 is further provided with a driving mounting hole, and the dismounting tool rotates the pressure relief cover 41 through the driving mounting hole.

The pressure relief rod 42 is arranged in the middle of the pressure relief cover 41 in a penetrating manner; and a pressure relief sealing ring 48 is installed between the pressure relief rod 42 and the pressure relief cover 41.

The inner end surface of the pressure relief rod 42 is provided with a valve needle mounting hole, and the pressure relief valve needle 43 is mounted on the inner end surface of the pressure relief rod 42 and used for sealing or communicating the first pressure relief hole 217. The outer end of the pressure relief rod 42 is provided with a pressure relief handle 421.

Specifically, the pressure relief mechanism 40 further includes a pressure relief seat 46 and a first pressure relief gasket 47, the first pressure relief seat 46 is mounted on the first pressure relief hole 217 through the first pressure relief gasket 47, a third pressure relief hole 461 communicating with the first pressure relief hole 217 is opened at the center of the pressure relief seat 46, and the third pressure relief hole 461 is used for matching with the pressure relief valve needle 43.

The inner end of the pressure relief rod 42 is provided with an outward turned edge, and the pressure relief piston 44 is mounted at the inner end of the pressure relief rod 42 and abuts against the outward turned edge. A pressure relief sealing groove is formed in the side wall of the pressure relief piston 44, and a pressure relief O-shaped ring is arranged in the pressure relief sealing groove. In order to improve the lubricating performance of the pressure relief O-ring, an oil supplementing hole 441 communicated with the pressure relief sealing groove is formed in the pressure relief piston 44, and the other end of the oil supplementing hole 441 is arranged in the pressure relief cavity 216 where the pressure relief valve needle 43 is located.

The pressure relief spring 45 is sleeved outside the pressure relief rod 42 and is abutted between the pressure relief cover 41 and the pressure relief piston 44. Further, a second relief washer 49 is provided between the relief spring 45 and the relief cover 41, and the second relief washer 49 is in contact with the relief seal ring 48 between the relief rod 42 and the relief cover 41.

Normally, under the action of the pressure relief spring 45, the pressure relief piston 44 seals the second pressure relief hole 218, and the pressure relief valve needle 43 seals the first pressure relief hole 217.

When the pressure in the piston cavity exceeds the preset value of the pressure relief mechanism, the pressure relief piston 44 moves, at this time, the pressure relief channel conducts the inner cavity of the oil bag through the first pressure relief hole 217 and the second pressure relief hole 218, and hydraulic oil in the piston cavity flows into the inner cavity of the oil bag until the pressure in the piston cavity is equal to or less than the preset value of the pressure relief mechanism, so that automatic pressure relief is realized.

This pressure release mechanism can also reset by hand, specifically as follows: when the pressure relief handle 421 is pressed, the pressure relief rod 42 drives the pressure relief piston 44 to move, so as to open the first pressure relief hole 217 and the second pressure relief hole 218, and manual oil return is realized.

In addition, in this embodiment, two second pressure relief holes 218 are formed in the side wall of the pressure relief cavity 216, so that quick reset can be realized.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered by the protection scope of the utility model.

Claims (10)

1. A pair of shearing pliers, comprising:

the oil cylinder device (2) comprises a cylinder body (21), and the front end of the cylinder body is provided with a piston cavity (211);

a piston device (5) comprising a drive piston rod and a drive piston, mounted within the piston cavity (211); and

a tong head device (6) arranged at the front end of the cylinder body (21);

wherein, binding clip device includes:

a caliper body (60) mounted on the front end of the piston chamber (211);

the guide support (61) is provided with a support main body (611) and two guide arms (612) arranged on the same side of the support main body (611), the guide arms (612) are symmetrically distributed up and down, and the end parts of the guide arms are installed on the forceps body (60) through positioning pins (62), so that a working space is formed between the guide support (61) and the forceps body (60), and guide channels (63) are arranged on the upper side wall and the lower side wall of the working space;

the movable die holder (64) is movably arranged in the guide channel (63) and is connected with a driving piston rod of the piston device (5);

the fixed die holder is arranged in the guide support (61) and is matched with the movable die holder (64).

2. A cutting nipper according to claim 1, wherein said movable die holder (64) and said stationary die holder are a pipe die or a wire die.

3. A cutting nipper as claimed in claim 1, wherein said guide passage (63) has a first guide groove (631) opened on the guide arm (612) and the nipper body (60) and a second guide groove (632) opened on a groove wall of the first guide groove (631);

the upper side and the lower side of the movable die holder (64) are respectively provided with a first guide part (641) matched with the first guide groove (631) and a second guide part (642) matched with the second guide groove (632).

4. A cutting nipper as claimed in claim 1, wherein said guide arm (612) has a positioning slot (613) formed at its end, and said nipper body (60) has a positioning protrusion (601) fitted into said positioning slot (613), both of which are fixed to each other by said positioning pin (62).

5. A cutting nipper as claimed in any one of claims 1 to 4, wherein an oil bag device (1) for storing oil is installed at the rear end of said cylinder body;

the cylinder body (21) is also provided with an oil inlet channel (212) and a pressure relief channel (213) which are respectively communicated with the piston cavity (211) and the oil bag device (1); a pump cavity (214) is formed in the oil inlet channel (212), and an oil pump assembly (22) is installed in the pump cavity (214); the liquid inlet end and the liquid outlet end of the pump cavity (214) are respectively provided with an oil inlet one-way valve (23) and an oil outlet one-way valve (24);

oil feed check valve (23) and oil outlet check valve (24) all include:

the valve body (11) is at least provided with an oil inlet hole (111), a valve core mounting cavity (112) and an oil outlet hole (113) which are sequentially communicated with the oil inlet channel (212);

the valve core (12) is movably arranged in the valve core mounting cavity (112) and is used for sealing or conducting the oil inlet hole (111); and

a reset piece (13) installed between the valve core (12) and the valve body (11);

wherein the valve element (12) further comprises:

the guide part (121) is formed on the side wall of the valve core (12), is arranged on the inner wall of the valve core mounting cavity (112) and is used for guiding; and

and the channel part (122) is formed between two adjacent guide parts (121) and is used for communicating the oil inlet hole (111) and the oil outlet hole (113).

6. A nipper as claimed in claim 5, wherein said guide portion (121) and channel portion (122) are formed in a spiral shape and arranged uniformly on the periphery of the side wall of said core (12).

7. A cutting nipper as claimed in claim 1, wherein said piston chamber (211) is provided with a plurality of reinforcing grooves (215) or reinforcing ribs, respectively, on the outside of said cylinder (21).

8. A cutting nipper as claimed in claim 5, wherein said oil pump unit (22) is provided with a driving means (3) on the outer end of the cylinder, said driving means (3) comprising:

the motor support (31) is fixed on the cylinder body (21) where the pump cavity (214) is located and is provided with a cam cavity (311) and a speed reduction cavity (312);

the driving motor (32) is arranged at the outer end of the motor support (31);

the speed reducer (33) is arranged in the speed reducing cavity (312) and is connected with the output end of the driving motor (32); and

and the camshaft (34) is installed in the cam cavity (311) and connected with the output end of the speed reducer (33) and is used for driving the plunger (221) of the oil pump assembly (22) to reciprocate.

9. A cutting nipper as claimed in claim 8, wherein said reducer (33) comprises:

an inner gear ring (331) mounted on a sidewall of the reduction chamber (312); and

at least one gear bracket (332), each gear bracket (332) is provided with a planetary gear set (333), the planetary gear set (333) is arranged on the inner gear ring (331), and the planetary gear set (333) is also meshed with the output end of the driving motor (32) or the output end of the previous gear bracket (332);

wherein the output end of the final gear bracket (332) is connected with the camshaft (34).

10. A cutting nipper as claimed in claim 8, wherein said cam shaft (34) comprises a first section (341), an eccentric section (342) and a second section (343), said first section (341) and second section (343) being coaxially arranged and respectively mounted on the motor mount (31) by means of a first bearing (35); the eccentric section (342) is eccentrically disposed between the first section (341) and the second section (343); the outer side of the eccentric section (342) is sleeved with a second bearing (36) connected with the plunger (221).

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