阅读说明：本技术 一种行程末端缓冲的锁紧油缸结构 (Locking oil cylinder structure with stroke end buffering function ) 是由 王建忠 王军 朱诗广 于 2020-08-10 设计创作，主要内容包括：本发明公开了一种行程末端缓冲的锁紧油缸结构,包括油压缸本体,油压缸本体的工作缸体内部开设有挤压仓,工作缸体的一侧开设有回压仓,回压仓中插入有挤压杆,挤压仓的内壁上固定安装有减速机构,工作缸体顶端的两侧皆安装有一组防护机构,挤压杆外侧的工作缸体一侧开设有清洁机构,回压仓内壁上开设有缓冲机构。本发明利用油从挤压槽中流出挤压使得挤压杆的速度降低,减小了挤压杆的撞击力,避免刀具受损；利用清洁环刀对挤压杆上的废料进行清理,利用海绵圈套对挤压杆表面的灰尘进行刮取,避免灰尘堆积在密封套处,使得装置不易受到灰尘入侵。(The invention discloses a locking oil cylinder structure with stroke end buffering, which comprises an oil pressure cylinder body, wherein an extrusion bin is arranged inside a working cylinder body of the oil pressure cylinder body, a back pressure bin is arranged on one side of the working cylinder body, an extrusion rod is inserted into the back pressure bin, a speed reducing mechanism is fixedly arranged on the inner wall of the extrusion bin, a group of protection mechanisms are arranged on two sides of the top end of the working cylinder body, a cleaning mechanism is arranged on one side of the working cylinder body outside the extrusion rod, and a buffering mechanism is arranged on the inner wall of the back pressure bin. According to the invention, the extrusion is performed by using the oil flowing out of the extrusion groove, so that the speed of the extrusion rod is reduced, the impact force of the extrusion rod is reduced, and the cutter is prevented from being damaged; the waste on the extrusion rod is cleaned by the aid of the cleaning ring cutter, dust on the surface of the extrusion rod is scraped by the aid of the sponge ring sleeve, and the dust is prevented from being accumulated in a sealing sleeve, so that the device is not easy to invade by the dust.)

1. The utility model provides a locking hydro-cylinder structure of end of stroke buffering, includes oil hydraulic cylinder body (1), its characterized in that: the oil hydraulic cylinder body (1) comprises a working cylinder body (110), an extrusion bin (111) is arranged inside the working cylinder body (110), a back pressure bin (112) is arranged on one side of the working cylinder body (110), an extrusion rod (113) is inserted into the back pressure bin (112), a baffle (114) is sleeved on the extrusion rod (113), a first sealing ring (115) is sleeved on the baffle (114), and the first sealing ring (115) is tightly attached to the inner wall of the back pressure bin (112); a pressure gauge (116) is sleeved in a through hole formed in one end of the working cylinder body (110), one side of the pressure gauge (116) is connected with an electromagnetic valve (117) through a lead, and the electromagnetic valve (117) is sleeved on the working cylinder body (110); the oil inlets on two sides of the top end of the working cylinder body (110) are sleeved with conversion heads (118), the front surface of the working cylinder body (110) is fixedly provided with a stabilizer bar (119), a through hole formed in one side of the working cylinder body (110) is sleeved with a sealing sleeve (120), and the inner wall of the extrusion bin (111) is fixedly provided with a speed reducing mechanism (2); the speed reducing mechanism (2) comprises a blocking sleeve (210), the blocking sleeve (210) is connected to the inner wall of the extrusion bin (111), an oil pushing plate (211) is arranged on one side of the blocking sleeve (210), a second sealing ring (212) is sleeved on the oil pushing plate (211), and the second sealing ring (212) is tightly attached to the inner wall of the extrusion bin (111); an extrusion groove (214) is formed in the oil pushing plate (211), a short rod (213) is fixedly mounted on the inner wall of the extrusion groove (214), a push rod (215) is inserted into a through groove formed in the short rod (213), clamping rods (216) are fixedly mounted at the upper end and the lower end of the push rod (215), and a pushing plate (217) is fixedly mounted on one side of the push rod (215); the bottom end of the push plate (217) is fixedly provided with a compression spring (218), one end of the compression spring (218) is connected to the short rod (213), one side of the compression spring (218) is provided with an arc-shaped groove (219), one side of the oil pushing plate (211) is fixedly provided with two sliding mechanisms (3), and the number of the sliding mechanisms (3) is two; a set of protection machanism (4) are all installed to the both sides on working cylinder body (110) top, and the quantity of every protection machanism (4) of group is two, clean mechanism (5) have been seted up to working cylinder body (110) one side in the extrusion stem (113) outside, buffer gear (6) have been seted up on back pressure storehouse (112) inner wall of baffle (114) one side, and the quantity of buffer gear (6) is two.

2. The locking cylinder structure with stroke end buffering function as claimed in claim 1, wherein: and a rubber pad (121) is fixedly arranged on one side of the extrusion rod (113).

3. The locking cylinder structure with stroke end buffering function as claimed in claim 1, wherein: slide mechanism (3) include slide bar (312), slide bar (312) are connected on pushing away oil board (211), spout (311) have been seted up on the inner wall of working cylinder body (110), and slide bar (312) slidable mounting in spout (311), it has drain tank (310) to open in slide bar (312).

4. The locking cylinder structure with stroke end buffering function as claimed in claim 1, wherein: protection machanism (4) are including solid fixed cylinder (410), gu fixed cylinder (410) are connected on working cylinder body (110), gu be equipped with pull rod (411) on fixed cylinder (410), lead screw (412) have been inserted in the screw hole of seting up on pull rod (411), arc splint (413) have been cup jointed through the pivot to one side of lead screw (412), anti-skidding line (414) have been seted up to one side of arc splint (413).

5. The locking cylinder structure with stroke end buffering function as claimed in claim 4, wherein: the top end of the fixed cylinder (410) is provided with a telescopic groove (417), the pull rod (411) is inserted into the telescopic groove (417), the pull rod (411) is provided with an insertion groove (415), the number of the insertion grooves (415) is two or three, the two sides of the fixed cylinder (410) are provided with fixing grooves (418), two limiting rods (416) are inserted into the fixing grooves (418), and the insertion grooves (415) are penetrated by the limiting rods (416).

6. The locking cylinder structure with stroke end buffering function as claimed in claim 1, wherein: the cleaning mechanism (5) comprises an adsorption groove (512), the adsorption groove (512) is formed in the working cylinder body (110), a cleaning ring cutter (510) is arranged on one side of the adsorption groove (512), the cleaning ring cutter (510) penetrates through the extrusion rod (113), a sponge ring sleeve (511) is sleeved on one side of the cleaning ring cutter (510), and the inner surface of the sponge ring sleeve (511) is in close contact with the outer surface of the extrusion rod (113).

7. The locking cylinder structure with stroke end buffering function as claimed in claim 6, wherein: fixed mounting has second magnetite (514) on the inner wall of absorption groove (512), one side fixed mounting of clean cutting ring (510) has first magnetite (513).

8. The locking cylinder structure with stroke end buffering function as claimed in claim 1, wherein: buffer gear (6) include dashpot (610), on the inner wall in return pressure storehouse (112) was seted up in dashpot (610), fixed mounting has buffer spring (611) on the inner wall of dashpot (610), one side fixed mounting of buffer spring (611) has buffer board (612), one side fixed mounting of buffer board (612) has rubber slab (613).

Technical Field

The invention relates to the technical field of oil cylinders, in particular to a locking oil cylinder structure with a stroke end buffering function.

Background

The hydraulic control is a control mode that pressurized liquid is used as control signal transmission, a control system formed by hydraulic technology is called as a hydraulic control system, and modern processing production gradually approaches to full mechanization, so that the hydraulic technology cannot be separated. For example, an oil cylinder is generally selected to be locked by an existing servo tool rest, but the locking force of the oil cylinder used by the existing servo tool rest is large, the impact during locking is also large, the damage of a blade is easily caused, the locking speed of the oil cylinder is obviously reduced due to the adoption of a slow oil feeding mode, the tool changing speed of the servo tool rest is seriously influenced, and therefore a locking oil cylinder structure with a stroke end buffering function needs to be designed.

Disclosure of Invention

The invention aims to provide a locking oil cylinder structure with a stroke tail end buffer, which aims to solve the problems that the locking force of an oil cylinder used by the conventional servo tool rest in the background art is large, the impact is large during locking, the blade is easy to damage, the locking speed of the oil cylinder is obviously reduced due to the adoption of a slow oil feeding mode, and the tool changing speed of the servo tool rest is seriously influenced.

In order to achieve the purpose, the invention provides the following technical scheme: a locking oil cylinder structure with stroke end buffering comprises an oil cylinder body, wherein the oil cylinder body comprises a working cylinder body, an extrusion bin is arranged inside the working cylinder body, a back pressure bin is arranged on one side of the working cylinder body, an extrusion rod is inserted into the back pressure bin, a baffle is sleeved on the extrusion rod, a first sealing ring is sleeved on the baffle, the inner walls of the first sealing ring and the back pressure bin are tightly attached, a pressure gauge is sleeved in a through hole formed in one end of the working cylinder body, one side of the pressure gauge is connected with an electromagnetic valve through a lead, the electromagnetic valve is sleeved on the working cylinder body, conversion heads are sleeved in oil inlets on two sides of the top end of the working cylinder body, a stabilizing rod is fixedly arranged in the front of the working cylinder body, a sealing sleeve is sleeved in a through hole formed in one side of the working cylinder body, and a speed reducing mechanism is fixedly arranged on the inner, the speed reducing mechanism comprises a blocking sleeve, the blocking sleeve is connected to the inner wall of the extrusion bin, an oil pushing plate is arranged on one side of the blocking sleeve, a second sealing ring is sleeved on the oil pushing plate and tightly attached to the inner wall of the extrusion bin, an extrusion groove is formed in the oil pushing plate, a short rod is fixedly mounted on the inner wall of the extrusion groove, a push rod is inserted into a through groove formed in the short rod, clamping rods are fixedly mounted at the upper end and the lower end of the push rod, a push plate is fixedly mounted on one side of the push rod, a compression spring is fixedly mounted at the bottom end of the push plate, one end of the compression spring is connected to the short rod, an arc-shaped groove is formed in one side of the compression spring, sliding mechanisms are fixedly mounted on one side of the oil pushing plate, the number of the sliding mechanisms is two, a group of protection mechanisms is mounted on two sides of the top end of the working cylinder body, and the number of each group, the cleaning mechanism is arranged on one side of the working cylinder body on the outer side of the extrusion rod, the buffer mechanisms are arranged on the inner wall of the back pressure bin on one side of the baffle, and the number of the buffer mechanisms is two.

Preferably, a rubber pad is fixedly mounted on one side of the extrusion rod.

Preferably, slide mechanism includes the slide bar, the slide bar connection is on pushing away the oiled-plate, the spout has been seted up on the inner wall of work cylinder body, and slide bar slidable mounting is in the spout, the play liquid tank has been seted up in the slide bar.

Preferably, the protection mechanism comprises a fixed cylinder, the fixed cylinder is connected to the working cylinder body, a pull rod is arranged on the fixed cylinder, a screw rod is inserted into a threaded hole formed in the pull rod, an arc-shaped clamping plate is sleeved on one side of the screw rod through a rotating shaft, and anti-skid grains are formed in one side of the arc-shaped clamping plate.

Preferably, the top end of the fixed cylinder is provided with a telescopic groove, the pull rod is inserted into the telescopic groove, the pull rod is provided with slots, the number of the slots is two or three, the two sides of the fixed cylinder are provided with fixed slots, the two fixed slots are provided with limit rods, and the slots are penetrated by the limit rods.

Preferably, the cleaning mechanism comprises an adsorption groove, the adsorption groove is formed in the working cylinder body, a cleaning ring cutter is arranged on one side of the adsorption groove and is penetrated through by the extrusion rod, a sponge ring sleeve is sleeved on one side of the cleaning ring cutter, and the inner surface of the sponge ring sleeve is in close contact with the outer surface of the extrusion rod.

Preferably, a second magnet is fixedly mounted on the inner wall of the adsorption groove, and a first magnet is fixedly mounted on one side of the cleaning cutting ring.

Preferably, buffer gear includes the dashpot, the dashpot is seted up on the inner wall in back pressure storehouse, fixed mounting has buffer spring on the inner wall of dashpot, one side fixed mounting of buffer spring has the buffer board, one side fixed mounting of buffer board has the rubber slab.

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

1. through setting up reduction gears, manometer, solenoid valve, utilize to push away the extrusion of oil board and make the stripper bar advance fast, utilize oil to flow out the extrusion from extrusion groove simultaneously and make the speed of stripper bar reduce at the stroke end to make the stripper bar can slow down before contacting the cutter soon, reduced the instantaneous pressure that the stripper bar struck the cutter, avoided leading to the cutter impaired because assaulting greatly, can not influence tool changing speed too much simultaneously.

2. Through setting up lead screw, pull rod, arc splint and anti-skidding line, can carry out the centre gripping protection to income oil pipe that this device used, avoid leading to into oil pipe because the crookedness of going into oil pipe and work cylinder body is too high and damages for the security performance of this device has obtained the enhancement, and utilizes the controllability of lead screw can protect the income oil pipe of different widths, has promoted the suitability of this device.

3. Through setting up clean cutting ring and sponge snare, utilize clean cutting ring to clear up adnexed waste material on the extrusion stem, utilize the sponge snare to scrape the adnexed dust in extrusion stem surface and get, avoid the dust to continuously pile up in seal cover department, can also prevent simultaneously that the extrusion stem probably brings the dust into back pressure storehouse in for this device is difficult for receiving the dust invasion.

Drawings

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

FIG. 2 is a schematic front view of the structure of the present invention;

FIG. 3 is a schematic sectional front view of the reduction mechanism according to the present invention;

FIG. 4 is a schematic sectional front view of the protection mechanism of the present invention;

FIG. 5 is a schematic top view of a lead screw structure according to the present invention;

FIG. 6 is a schematic sectional front view of the cleaning mechanism of the present invention;

FIG. 7 is a side view of the cleaning ring blade of the present invention;

fig. 8 is a schematic front sectional view of a buffering mechanism according to the present invention.

In the figure: 1. an oil hydraulic cylinder body; 110. a working cylinder body; 111. extruding the bin; 112. a back pressure bin; 113. an extrusion stem; 114. a baffle plate; 115. a first seal ring; 116. a pressure gauge; 117. an electromagnetic valve; 118. a conversion head; 119. a stabilizer bar; 120. sealing sleeves; 121. a rubber pad; 2. a speed reduction mechanism; 210. a blocking sleeve; 211. an oil pushing plate; 212. a second seal ring; 213. a short bar; 214. extruding a groove; 215. a push rod; 216. a position clamping rod; 217. pushing the plate; 218. a compression spring; 219. an arc-shaped slot; 3. a sliding mechanism; 310. a liquid outlet groove; 311. a chute; 312. a slide bar; 4. a protection mechanism; 410. a fixed cylinder; 411. a pull rod; 412. a screw rod; 413. an arc-shaped splint; 414. anti-skid lines; 415. a slot; 416. a limiting rod; 417. a telescopic groove; 418. fixing grooves; 5. a cleaning mechanism; 510. cleaning the cutting ring; 511. a sponge ring sleeve; 512. an adsorption tank; 513. a first magnet; 514. a second magnet; 6. a buffer mechanism; 610. a buffer tank; 611. a buffer spring; 612. a buffer plate; 613. a rubber plate.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the accompanying drawings, 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.

Referring to fig. 1-8, an embodiment of the present invention: the utility model provides a locking hydro-cylinder structure of end of stroke buffering, includes oil hydraulic cylinder body 1, and oil hydraulic cylinder body 1 includes working cylinder body 110, and extrusion storehouse 111 has been seted up to working cylinder body 110's inside, and back pressure storehouse 112 has been seted up to one side of working cylinder body 110, has inserted extrusion rod 113 in the back pressure storehouse 112, has cup jointed baffle 114 on the extrusion rod 113, has cup jointed first sealing washer 115 on the baffle 114, and the inner wall in first sealing washer 115 and back pressure storehouse 112 closely laminates. The pressure gauge 116 is sleeved in a through hole formed in one end of the working cylinder body 110, one side of the pressure gauge 116 is connected with the electromagnetic valve 117 through a lead, the electromagnetic valve 117 is sleeved on the working cylinder body 110, the switching heads 118 are sleeved in oil inlets on two sides of the top end of the working cylinder body 110, the stabilizer bar 119 is fixedly installed on the front side of the working cylinder body 110, and the sealing sleeve 120 is sleeved in the through hole formed in one side of the working cylinder body 110. The inner wall of the extrusion bin 111 is fixedly provided with a speed reducing mechanism 2, the speed reducing mechanism 2 comprises a blocking sleeve 210, the blocking sleeve 210 is connected to the inner wall of the extrusion bin 111, one side of the blocking sleeve 210 is provided with an oil pushing plate 211, the oil pushing plate 211 is sleeved with a second sealing ring 212, and the second sealing ring 212 is tightly attached to the inner wall of the extrusion bin 111; an extrusion groove 214 is formed in the oil pushing plate 211, a short rod 213 is fixedly mounted on the inner wall of the extrusion groove 214, and a push rod 215 is inserted into a through groove formed in the short rod 213; clamping rods 216 are fixedly mounted at the upper end and the lower end of the push rod 215, a push plate 217 is fixedly mounted on one side of the push rod 215, a compression spring 218 is fixedly mounted at the bottom end of the push plate 217, one end of the compression spring 218 is connected to the short rod 213, and an arc-shaped groove 219 is formed in one side of the compression spring 218. One side fixed mounting that pushes away oiled plate 211 has slide mechanism 3, and slide mechanism 3's quantity is two, and a set of protection machanism 4 is all installed to the both sides on working cylinder body 110 top, and the quantity of every group protection machanism 4 is two, and clean mechanism 5 has been seted up to working cylinder body 110 one side in the extrusion stem 113 outside, has seted up buffer gear 6 on the back pressure storehouse 112 inner wall of baffle 114 one side, and buffer gear 6's quantity is two. Extrusion that utilizes oil pushing plate 211 makes extrusion stem 113 advance fast, can make extrusion stem 113's speed reduce at the stroke end when oil flows out the extrusion from extrusion groove 214 to make extrusion stem 113 can slow down before touching the cutter soon, reduced extrusion stem 113 and strikeed the instantaneous pressure of cutter, avoided taking place because the too big circumstances that leads to the cutter impaired because the impact force, can not influence tool changing speed too much simultaneously.

In this embodiment, a rubber pad 121 is fixedly installed on one side of the pressing rod 113, so that the impact force of the pressing rod 113 on the tool can be further reduced by using the characteristic that the rubber pad 121 is soft.

In this embodiment, the sliding mechanism 3 includes a sliding rod 312, the sliding rod 312 is connected to the oil pushing plate 211, a sliding slot 311 is formed in the inner wall of the working cylinder 110, the sliding rod 312 is slidably mounted in the sliding slot 311, a liquid outlet slot 310 is formed in the sliding rod 312, and the sliding rod 312 slides in the sliding slot 311, so that the oil pushing plate 211 is more stable in the forward process, and the arrangement of the liquid outlet slot 310 can make the sliding rod 312 more convenient for discharging hydraulic oil when entering the sliding slot 311.

In this embodiment, the protection mechanism 4 includes a fixed cylinder 410, the fixed cylinder 410 is connected to the operating cylinder body 110, a pull rod 411 is arranged on the fixed cylinder 410, a screw rod 412 is inserted into a threaded hole formed in the pull rod 411, an arc-shaped clamping plate 413 is sleeved on one side of the screw rod 412 through a rotating shaft, and anti-skid patterns 414 are formed on one side of the arc-shaped clamping plate 413. This design can carry out the centre gripping protection to the income oil pipe that this device used, avoids leading to into the oil pipe because of the crookedness of going into oil pipe and work cylinder body 110 is too high and damages, has strengthened the security performance of device, and utilizes the controllability of lead screw 412 to make protection machanism 4 can protect the income oil pipe of different widths, has promoted the suitability of device.

In this embodiment, the top end of the fixed cylinder 410 is provided with a telescopic groove 417, the pull rod 411 is inserted into the telescopic groove 417, the pull rod 411 is provided with slots 415, the number of the slots 415 is three, the two sides of the fixed cylinder 410 are provided with fixing grooves 418, the two fixing grooves 418 are provided with limiting rods 416, the slots 415 are penetrated by the limiting rods 416, different slots 415 can be utilized to match with the limiting rods 416 for limiting, the arc-shaped clamping plate 413 can clamp different positions of the oil inlet pipe with different widths, and the device can meet the conversion of clamping stress points with different widths.

In this embodiment, the cleaning mechanism 5 includes an adsorption groove 512, the adsorption groove 512 is provided on the working cylinder 110, a cleaning ring cutter 510 is provided on one side of the adsorption groove 512, the cleaning ring cutter 510 is penetrated by the extrusion rod 113, a sponge ring sleeve 511 is sleeved on one side of the cleaning ring cutter 510, and the inner surface of the sponge ring sleeve 511 is in close contact with the outer surface of the extrusion rod 113; utilize clean cutting ring 510 to clear up the adnexed waste material on the extrusion stem 113, utilize sponge snare 511 to scrape the adnexed dust in extrusion stem 113 surface simultaneously and get, avoid the dust to pile up in seal cover 120 department continuously, prevent simultaneously that extrusion stem 113 probably brings the dust into back pressure storehouse 112 for this device is inside to be difficult for sneaking into the dust.

In this embodiment, fixed mounting has second magnetite 514 on the inner wall of absorption groove 512, and one side fixed mounting of clean cutting ring 510 has first magnetite 513, and the absorption limiting displacement through first magnetite 513 and second magnetite 514 realizes dismantling the change fast to clean cutting ring 510 and sponge snare 511 for this device maintenance is more convenient.

In this embodiment, the buffer mechanism 6 includes the buffer slot 610, the buffer slot 610 is opened on the inner wall of the back pressure chamber 112, a buffer spring 611 is fixedly installed on the inner wall of the buffer slot 610, a buffer plate 612 is fixedly installed on one side of the buffer spring 611, a rubber plate 613 is fixedly installed on one side of the buffer plate 612, and the elastic potential energy of the buffer spring 611 is utilized, so that when the extrusion rod 113 moves to the right, the extrusion rod cannot directly impact the inner wall of the back pressure chamber 112 due to oil pressure, and the damage probability of the baffle 114 is reduced to a certain extent.

The working principle is as follows: when the cleaning ring knife is used, whether the cleaning ring knife 510 and the sponge ring sleeve 511 need to be replaced or not is checked, if the cleaning ring knife 510 and the sponge ring sleeve 511 need to be replaced, the cleaning ring knife and the sponge ring sleeve are pulled out by hands, and at the moment, the adsorption limit relation between the first magnet 513 and the second magnet 514 is released; the cleaning ring cutter 510 and the sponge ring cover 511 can be taken out from one side of the pressing rod 113 and then replaced with a new one. Then, an oil pipe is connected into the two oil inlets of the device, and whether the switching head 118 is needed to carry out switching or not is determined by judging the width of the oil pipe. The stop lever 416 is then withdrawn from the slot 415 and the securing slot 418, the pull rod 411 is adjusted to the proper position, and the stop lever 416 is inserted back into the stop position. Then the screw rod 412 is rotated to enable the arc-shaped clamping plate 413 to move and be tightly clamped into the oil pipe, and the adjustment of other protection mechanisms 4 is completed in the same way.

During normal work, oil can enter into extrusion storehouse 111 from the right side oil inlet earlier to the extrusion pushes away oiled-plate 211 and makes its removal left, thereby extrudees the base oil that pushes away in oiled-plate 211 left side extrusion storehouse 111, makes its volume compression, thereby makes the stripper rod 113 remove to the left side. When the oil pushing plate 211 is extruded by newly-entered oil for a certain distance and then moves, the movement of the oil pushing plate is limited by the blocking sleeve 210, the newly-entered oil is uninterruptedly added into the extrusion bin 111, so that the pressure on the right side of the oil pushing plate 211 is gradually greater than the pressure on the left side, and the newly-entered oil pushes up the oil pushing plate 217 and then enters the extrusion bin 111 to continuously apply pressure on the extrusion rod 113 to move the extrusion rod. Since the pressurization of the new oil entering the left side of the extrusion chamber 111 from the extrusion groove 214 is significantly smaller than the pushing pressurization of the oil pushing plate 211, the extrusion rod 113 is slowed down in the final stroke, and the cutter is finally clamped. When the extrusion rod 113 needs to be reset, new oil is added from the left oil inlet, so that the volume of the oil in the back pressure chamber 112 is gradually increased, the baffle 114 is extruded, the extrusion rod 113 moves rightwards, the sponge ring sleeve 511 and the cleaning ring knife 510 rub the surface of the extrusion rod 113 in the moving process of the extrusion rod 113, the volume of the oil in the extrusion chamber 111 on the left side of the oil pushing plate 211 is compressed again when the extrusion rod 113 moves rightwards continuously, the oil pressure on the left side of the oil pushing plate 211 is larger than that on the right side, the extrusion plate 217 blocks the extrusion groove 214 and the oil pushing plate 211 moves rightwards, the sliding rod 312 is inserted into the sliding groove 311, the extruded oil in the sliding groove 311 is discharged from the oil outlet groove 310, the extrusion rod 113 moves rightwards continuously, and is firstly contacted with the rubber plate 613, and the action of force is reduced by the elastic potential energy of the buffer spring 611.

When the extrusion rod 113 moves rightwards, because part of the base oil on the left side of the oil pushing plate 211 is mixed with part of the newly-entered oil at the beginning of the stroke, the volume is increased, after the extrusion rod 113 extrudes in the return stroke, the pressure is increased when the oil pushing plate 211 cannot move rightwards any more, so that the pressure gauge 116 senses that the limited oil pressure value is abnormal, the electromagnetic valve 117 is opened, the extrusion rod 113 extrudes the redundant base oil, and the volume of the base oil is restored to the value before the stroke begins, namely, one complete action of the device.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive.