CN221581763U

CN221581763U - Rolling device for closing up plunger

Info

Publication number: CN221581763U
Application number: CN202323539117.0U
Authority: CN
Inventors: 王梅
Original assignee: Jingzhou Yiska Petroleum Equipment Co ltd
Current assignee: Jingzhou Yiska Petroleum Equipment Co ltd
Priority date: 2023-12-25
Filing date: 2023-12-25
Publication date: 2024-08-23
Anticipated expiration: 2033-12-25

Abstract

The utility model relates to the technical field of plunger assembly processing and discloses a rolling device for plunger closing, which comprises a workbench, four supporting legs, a working box, a lifting mechanism, a driving mechanism, a pressing mechanism and a cooling mechanism, wherein the four supporting legs are fixedly arranged at the bottom of the workbench and are symmetrically distributed in pairs, the working box is fixedly arranged at the top of the workbench, the lifting mechanism is arranged on the working box, the lifting box is arranged on the lifting mechanism, the lifting mechanism is used for controlling the lifting box to move up and down, the driving mechanism is arranged on the lifting box, and the plunger assembly is arranged on the driving mechanism. The utility model has the following advantages and effects: can step up fixedly and adjust from top to bottom to the plunger subassembly to conveniently carry out the roll extrusion operation to the plunger subassembly, can also carry out cooling to the plunger subassembly in the roll extrusion process and four roll extrusion wheels, avoid the high temperature to destroy the physical properties of plunger subassembly, promote the quality of plunger subassembly roll extrusion.

Description

Rolling device for closing up plunger

Technical Field

The utility model relates to the technical field of plunger assembly machining, in particular to a rolling device for plunger necking.

Background

The swash plate type plunger pump is an important power element in a hydraulic system, and the oil suction and oil discharge process of the pump is mainly realized by pushing the plunger to reciprocate through a swash plate. The plunger assembly consisting of the plunger and the sliding shoe is a main component of the plunger pump, and the closing-in quality between the plunger and the sliding shoe directly influences the performance and the service life of the plunger pump. The traditional necking process adopts a manual impact method, a necking tool is required to be manufactured, and a pincers worker adopts a knocking method to deform the part necking part during necking, so that the purpose of necking is achieved. At present, a half die closing-in process and a plurality of groups of rolling wheel closing-in processes are generally adopted for closing-in of the plunger assembly, but the half die closing-in process requires a multi-stage die, so that locking phenomenon is easy to occur, the production efficiency is low, and the plunger assembly is required to be rolled loose by a roller, so that the plunger assembly is not suitable for mass production; the closing-in process of the rolling wheels needs to accurately adjust the positions of the rolling wheels, the precision is difficult to adjust, the process is complicated, the repeated precision is poor, the plunger play after closing-in cannot meet the requirement, the sliding shoe and the plunger are poor in rotation flexibility, and the volume cannot be too small due to the fact that the rolling wheels bear large pressure, so that the closing-in process is not suitable for closing-in of a plunger component of a miniature plunger pump.

In the prior art, chinese patent publication No. CN218191910U discloses a rolling device for closing up a plunger assembly, which comprises a rolling mechanism, wherein the rolling mechanism comprises a roller frame, the front end of the roller frame is provided with a U-shaped groove, two groups of positioning pins which are parallel to each other are arranged in the U-shaped groove, and the bottoms of the positioning pins are fixedly connected with the roller frame; the outside cover of locating pin is equipped with the rolling wheel for the side of roll extrusion plunger subassembly closes up, and the cover is equipped with antifriction bearing between locating pin and the rolling wheel. The device needs control rolling mechanism to rotate when closing up to the plunger subassembly, and rolling mechanism's quick rotation has the potential safety hazard to operating personnel to rolling wheel and plunger can generate heat and send out scalding in high-speed friction, influence the physical properties of plunger.

Therefore, it is necessary to design a rolling device for closing up the plunger, which is safe to operate and can cool down the rolling wheel and the plunger.

Disclosure of utility model

The utility model aims to provide a rolling device for closing up a plunger, which has the effects of safe operation and capability of cooling a rolling wheel and the plunger.

The technical aim of the utility model is realized by the following technical scheme: the utility model provides a rolling press device for plunger binding off, comprises a workbench, four supporting legs, the work box, the lift box, elevating system, actuating mechanism, pressing mechanism and cooling body, four equal fixed mounting of supporting legs are in the bottom of work box and be two liang symmetric distribution, work box fixed mounting is at the top of work box, elevating system sets up on the work box, the lift box sets up on elevating system, elevating system is used for controlling the lift box and reciprocates, actuating mechanism sets up on the lift box, the plunger subassembly sets up on actuating mechanism, actuating mechanism is used for controlling the plunger subassembly and rotates, pressing mechanism and cooling body all set up on the work box, pressing mechanism is used for extruding the plunger subassembly, cooling body is used for cooling down the plunger subassembly.

Through adopting above-mentioned technical scheme, can step up the fixing to plunger subassembly to control plunger subassembly and go on about position adjustment and rotation, promote the precision of roll extrusion, can also carry out cooling to plunger subassembly and rolling wheel through cooling body, guarantee the quality of plunger subassembly roll extrusion.

The utility model is further provided with: the lifting mechanism comprises a first motor, a locating plate, a screw rod and a lifting block, wherein the first motor and the locating plate are fixedly installed on the left inner wall of the working box, the locating plate is located above the first motor, the screw rod is fixedly installed at the output shaft end of the first motor, the top end of the screw rod rotates to penetrate through the locating plate and is rotationally connected with the top inner wall of the working box, the lifting block is installed on the screw rod in a threaded mode, and the lifting box is fixedly installed on the right side of the lifting block.

Through adopting above-mentioned technical scheme, can control the plunger subassembly and carry out upper and lower position adjustment, promote the precision of plunger subassembly roll extrusion.

The utility model is further provided with: the left side inner wall of the working box is provided with a limit groove above the locating plate, and the left side of the lifting block is slidably arranged in the limit groove.

By adopting the technical scheme, the stability of the up-and-down movement of the plunger assembly can be improved.

The utility model is further provided with: the driving mechanism comprises a second motor and a three-jaw chuck, the second motor is fixedly arranged on the left inner wall of the lifting box, the three-jaw chuck is fixedly sleeved at the output shaft end of the second motor, the plunger assembly is detachably arranged on the three-jaw chuck, and the right end of the plunger assembly extends out of the lifting box.

Through adopting above-mentioned technical scheme, can step up the fixed to the plunger subassembly to the convenient control plunger subassembly rotates.

The utility model is further provided with: the lifting box is internally and fixedly provided with a rotating ring, the annular inner wall of the rotating ring is fixedly connected with the three-jaw chuck, and the lifting box is provided with a key hole.

Through adopting above-mentioned technical scheme, can support the rotation of three-jaw chuck, promote plunger subassembly pivoted stability.

The utility model is further provided with: the pressing mechanism comprises two hydraulic rods, two supporting seats and four rolling wheels, wherein the two hydraulic rods are respectively and fixedly installed on the top of the workbench and the top inner wall of the working box, the two hydraulic rods are symmetrically distributed and are located on the right side of the lifting box, the two supporting seats are respectively and detachably installed on one sides of the two hydraulic rods, which are close to each other, the four rolling wheels are respectively and rotatably installed on the two supporting seats and are symmetrically distributed in pairs, and the four rolling wheels are of a round table structure and have smooth sides.

By adopting the technical scheme, the plunger assembly can be controlled to be extruded by the four rolling wheels.

The utility model is further provided with: the cooling mechanism comprises a fixing plate, a water tank, an exhaust fan, an air inlet pipe, a filter box, an exhaust pipe, an air outlet pipe and an air outlet cover, wherein the fixing plate is fixedly arranged on the inner wall of the right side of the working box, the water tank and the exhaust fan are fixedly arranged at the top of the fixing plate, the exhaust fan is positioned on the left side of the water tank, the air inlet pipe is fixedly arranged at the air inlet end of the exhaust fan, one end of the air inlet pipe, which is far away from the exhaust fan, extends out of the working box, the filter box is detachably arranged at one end of the air inlet pipe, which is located outside the working box, the exhaust pipe is fixedly arranged at the exhaust end of the exhaust fan, one end, which is far away from the exhaust fan, extends to the position below the cooling liquid level in the water tank, the air outlet pipe is fixedly arranged on the left side of the water tank, and the air outlet cover is fixedly arranged at the left end of the air outlet pipe and positioned on the right side of the plunger assembly.

Through adopting above-mentioned technical scheme, can carry out cooling to the air of suction, and then spout the cold wind to rolling plunger subassembly and four rolling wheels, avoid the physical properties of high influence plunger subassembly of temperature.

The utility model is further provided with: a refrigerating plate is fixedly arranged on the inner wall of the bottom of the water tank, a copper sheet is fixedly arranged at one end of the exhaust pipe positioned in the water tank, and a plurality of air holes distributed in an annular array are formed in the copper sheet.

Through adopting above-mentioned technical scheme, can disperse the exhaust air current into a large amount of bubbles, increase with the area of contact of coolant liquid, promote the cooling efficiency of air current.

The utility model is further provided with: the temperature sensor positioned at the rear side of the plunger assembly is fixedly installed on the inner wall of the rear side of the working box, the temperature display screen is fixedly installed on the outer wall of the front side of the working box, and the air outlet is formed in the right side of the working box.

Through adopting above-mentioned technical scheme, can directly perceived connect the temperature of plunger subassembly and four rolling wheels, and then select whether to carry out the cooling operation.

The utility model is further provided with: the front side of the working box is provided with an access hole positioned below the temperature display screen, a box door is rotatably arranged on the access hole, and an observation window is arranged on the box door.

By adopting the technical scheme, the rolling progress of the plunger assembly can be conveniently monitored.

The beneficial effects of the utility model are as follows:

1. According to the utility model, the lifting mechanism consisting of the first motor, the locating plate, the screw rod and the lifting block is utilized, so that the height of the plunger assembly can be conveniently adjusted, and the rolling operation is conveniently carried out.

2. The utility model can clamp and fix the plunger assembly and roll the right end of the plunger assembly by utilizing the combined action of the second motor, the three-jaw chuck, the two hydraulic rods, the two supporting seats and the four rolling wheels.

3. According to the utility model, by utilizing the combined action of the fixing plate, the water tank, the exhaust fan, the air inlet pipe, the filter box, the exhaust pipe, the air outlet cover, the refrigerating plate and the copper sheet, the plunger assembly and the four rolling wheels in the rolling process can be cooled, so that the physical properties of the plunger assembly are prevented from being damaged by high temperature, and the rolling quality of the plunger assembly is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic perspective view of the present embodiment.

Fig. 2 is a schematic diagram of a front sectional structure of the present embodiment.

Fig. 3 is an enlarged schematic view of the portion a in fig. 2.

In the figure, 1, a workbench; 2. support legs; 3. a working box; 4. a lifting box; 5. a first motor; 6. a positioning plate; 7. a screw; 8. a lifting block; 9. a limit groove; 10. a second motor; 11. a three-jaw chuck; 12. a rotating ring; 13. a key hole; 14. a hydraulic rod; 15. a support base; 16. a rolling wheel; 17. a fixing plate; 18. a water tank; 19. an exhaust fan; 20. an air inlet pipe; 21. a filter box; 22. an exhaust pipe; 23. an air outlet pipe; 24. an air outlet cover; 25. a refrigeration plate; 26. copper sheets; 27. a temperature sensor; 28. a temperature display screen; 29. an air outlet; 30. a box door.

Detailed Description

The technical scheme of the present utility model will be clearly and completely described in connection with specific embodiments. It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model.

Referring to fig. 1, 2 and 3, the utility model provides a rolling device for closing up a plunger, comprising a workbench 1, four supporting legs 2, a working box 3, a lifting box 4, a lifting mechanism, a driving mechanism, a pressing mechanism and a cooling mechanism, wherein the four supporting legs 2 are fixedly arranged at the bottom of the workbench 1 and are symmetrically distributed in pairs, the working box 3 is fixedly arranged at the top of the workbench 1, the working box 3 can effectively protect operators and reduce noise pollution, the front side of the working box 3 is provided with an access hole positioned below a temperature display screen 28, a box door 30 is rotatably arranged on the access hole, an observation window is arranged on the box door 30, a temperature sensor 27 positioned at the rear side of a plunger assembly is fixedly arranged on the inner wall of the rear side of the working box 3, a temperature display screen 28 is fixedly arranged on the outer wall of the front side of the working box 3, through utilizing the combined action of temperature-sensing ware 27 and temperature display 28, can directly perceivedly connect the temperature of plunger subassembly and four rolling wheels, and then whether select to cool down the operation, gas outlet 29 has been seted up on the right side of working box 3, elevating system sets up on working box 3, lifting box 4 sets up on elevating system, lifting box 4 is used for driving the plunger subassembly and removes, elevating system is used for controlling lifting box 4 and reciprocates, actuating mechanism sets up on lifting box 4, the plunger subassembly sets up on actuating mechanism, actuating mechanism is used for controlling the plunger subassembly and rotates, pressing mechanism and cooling body all set up on working box 3, pressing mechanism is used for extrudeing the plunger subassembly, cooling body is used for carrying out the cooling down to the plunger subassembly, specifically, cooling body includes fixed plate 17, water tank 18, air exhauster 19, air-supply line 20, filter box 21, exhaust pipe 22-, an air outlet pipe 23 and an air outlet cover 24, a fixing plate 17 is fixedly arranged on the right inner wall of the working box 3, a water tank 18 and an exhaust fan 19 are fixedly arranged at the top of the fixing plate 17, the exhaust fan 19 is positioned at the left side of the water tank 18, an air inlet pipe 20 is fixedly arranged at the air inlet end of the exhaust fan 19, one end of the air inlet pipe 20 far away from the exhaust fan 19 extends to the outside of the working box 3, a filter box 21 is detachably arranged at one end of the air inlet pipe 20 positioned at the outside of the working box 3, the filter box 21 is used for filtering dust impurities in the air, an exhaust pipe 22 is fixedly arranged at the exhaust end of the exhaust fan 19, one end of the exhaust pipe 22 far away from the exhaust fan 19 extends to the position below the cooling liquid level in the water tank 18, the air outlet pipe 23 is fixedly arranged on the left side of the water tank 18, the air outlet cover 24 is fixedly arranged at the left end of the air outlet pipe 23 and positioned on the right side of the plunger assembly, the air outlet cover 24 is used for expanding the coverage range of cool air, the four rolling wheels 16 are cooled, the refrigerating plate 25 is fixedly arranged on the inner wall of the bottom of the water tank 18, the copper sheet 26 is fixedly arranged at one end of the air outlet pipe 22 positioned in the water tank 18, a plurality of air holes distributed in an annular array are formed in the copper sheet 26, the air holes are used for dispersing discharged air flow into a large number of air bubbles, the contact area with cooling liquid is increased, and the cooling efficiency of the air flow is improved.

Specifically, the pressing mechanism includes two hydraulic stems 14, two supporting seats 15 and four rolling wheels 16, two hydraulic stems 14 are respectively fixed mounting on the top of workstation 1 and the top inner wall of workstation 3, two hydraulic stems 14 are symmetrical distribution and all are located the right side of lift box 4, two supporting seats 15 demountable mounting respectively are on the one side that two hydraulic stems 14 are close to each other, four rolling wheels 16 are respectively rotate and install on two supporting seats 15 and are two liang symmetric distributions, four rolling wheels 16 are round platform shape structure and side smooth, actuating mechanism includes second motor 10 and three jaw chuck 11, second motor 10 fixed mounting is on the left side inner wall of lift box 4, second motor 10 is used for driving three jaw chuck 11 to rotate, three jaw chuck 11 fixed sleeve is established at the output axle head of second motor 10, three jaw chuck 11 is used for pressing from both sides tightly fixed to the plunger subassembly, the plunger subassembly is dismantled and is installed on three jaw chuck 11, the right-hand member of plunger subassembly extends to outside lift box 4, fixed mounting has rotation ring 12 in the lift box 4, three jaw chuck 11 is used for holding down the annular chuck 12 to rotate ring 12, three jaw chuck 11 is used for holding down the key hole 13 to the three jaw chuck 11, three jaw chuck 13 are connected with the key hole, three jaw chuck 13 are seted up to the key.

Specifically, elevating system includes first motor 5, locating plate 6, screw rod 7 and lifter 8, first motor 5 and equal fixed mounting of locating plate 6 are on the left side inner wall of work box 3, locating plate 6 is located the top of first motor 5, first motor 5 is used for driving screw rod 7 and rotates, it is to be noted that first motor 5 is positive and negative rotation motor, screw rod 7 fixed mounting is at the output axle head of first motor 5, screw rod 7 is used for driving lifter 8 and reciprocates, the top rotation of screw rod 7 runs through locating plate 6 and rotates with the top inner wall of work box 3 to be connected, lifter 8 screw thread is installed on screw rod 7, lifter 4 fixed mounting is on the right side of lifter 8, the spacing groove 9 that is located the locating plate 6 top is seted up on the left side inner wall of work box 3, the left side of lifter 8 is slided and is installed in spacing groove 9, upward and downward movement to lifter 8 can be guided and restrained through utilizing spacing groove 9.

In this embodiment, a control switch is installed on the working box 3, and the first motor 5, the second motor 10, the two hydraulic rods 14, the exhaust fan 19 refrigerating plate 25 and the control switch are electrically connected with an external power line sequentially through wires to form a loop, and the control switch can respectively control the start and stop operations of the first motor 5, the second motor 10, the two hydraulic rods 14 and the exhaust fan 19 refrigerating plate 25.

Through the structure, the rolling device for closing the plunger can tightly fasten and fix the plunger assembly and adjust the plunger assembly up and down, is convenient for rolling the plunger assembly, can cool down the plunger assembly and the four rolling wheels 16 in the rolling process, avoids damaging the physical property of the plunger assembly by high temperature, improves the rolling quality of the plunger assembly, opens the box door 30, firstly adjusts the three-jaw chuck 11 through the key hole 13 and tightens and fixes the plunger assembly, controls the first motor 5 to rotate positively according to the distance between the four rolling wheels 16, drives the screw rod 7 to rotate, drives the lifting block 8 to move downwards to enable the right end of the plunger assembly to be positioned in the middle of the four rolling wheels 16, closes the first motor 5, controls the second motor 10 to operate, the second motor 10 drives the three-jaw chuck 11 to rotate, and then drive the plunger assembly to rotate, control two hydraulic stems 14 to stretch, two hydraulic stems 14 promote four rolling wheels 16 and be close to the right-hand member to the plunger assembly and extrude, reach the purpose to the plunger assembly roll extrusion, through observing the temperature of the plunger assembly that shows on the temperature display screen 28, when the temperature is too high, control refrigeration board 25 and air exhauster 19 operation, air exhauster 19 extraction outside air and pressurization delivery are in blast pipe 22, the air current is dispersed into a large amount of bubbles and coolant liquid contact through a plurality of gas pockets, increase the cooling efficiency of air current, the coolant gas spouts plunger assembly and four rolling wheels 16 through the exhaust hood 24, can effectively avoid the destruction of high Wen Duizhu plunger assembly physical property, promote the quality of plunger assembly roll extrusion.

The rolling device for closing the plunger is described in detail. The principles and embodiments of the present utility model have been described herein with reference to specific examples, which are intended to be merely illustrative of the methods of the present utility model and their core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the utility model can be made without departing from the principles of the utility model and these modifications and adaptations are intended to be within the scope of the utility model as defined in the following claims.

Claims

1. A rolling press device for plunger binding off, its characterized in that includes workstation (1), four supporting legs (2), work box (3), lift box (4), elevating system, actuating mechanism, plunger subassembly, pressing mechanism and cooling body, four supporting legs (2) all fixed mounting are in the bottom of workstation (1) and are two liang symmetric distribution, work box (3) fixed mounting is in the top of workstation (1), elevating system sets up on work box (3), lift box (4) set up on the elevating system, elevating system is used for controlling lift box (4) and reciprocates, actuating mechanism sets up on lift box (4), the plunger subassembly sets up on the actuating mechanism, actuating mechanism is used for controlling the plunger subassembly and rotates, pressing mechanism and cooling body all set up on work box (3), pressing mechanism is used for extruding the plunger subassembly, cooling body is used for cooling down the plunger subassembly.

2. A rolling device for closing in a plunger according to claim 1, wherein: the lifting mechanism comprises a first motor (5), a positioning plate (6), a screw rod (7) and a lifting block (8), wherein the first motor (5) and the positioning plate (6) are fixedly installed on the left inner wall of the working box (3), the positioning plate (6) is located above the first motor (5), the screw rod (7) is fixedly installed at the output shaft end of the first motor (5), the top end of the screw rod (7) rotates to penetrate through the positioning plate (6) and is rotationally connected with the top inner wall of the working box (3), the lifting block (8) is installed on the screw rod (7) in a threaded mode, and the lifting box (4) is fixedly installed on the right side of the lifting block (8).

3. A rolling device for closing in a plunger according to claim 2, wherein: a limiting groove (9) positioned above the positioning plate (6) is formed in the left inner wall of the working box (3), and the left side of the lifting block (8) is slidably installed in the limiting groove (9).

4. A rolling device for closing in a plunger according to claim 2, wherein: the driving mechanism comprises a second motor (10) and a three-jaw chuck (11), the second motor (10) is fixedly installed on the left inner wall of the lifting box (4), the three-jaw chuck (11) is fixedly sleeved at the output shaft end of the second motor (10), the plunger assembly is detachably installed on the three-jaw chuck (11), and the right end of the plunger assembly extends out of the lifting box (4).

5. The rolling device for closing in a plunger according to claim 4, wherein: the lifting box (4) is internally and fixedly provided with a rotating ring (12), the annular inner wall of the rotating ring (12) is fixedly connected with the three-jaw chuck (11), and the lifting box (4) is provided with a key hole (13).

6. The rolling device for closing in a plunger according to claim 5, wherein: the pressing mechanism comprises two hydraulic rods (14), two supporting seats (15) and four rolling wheels (16), wherein the two hydraulic rods (14) are respectively and fixedly installed on the top of the workbench (1) and the top inner wall of the working box (3), the two hydraulic rods (14) are symmetrically distributed and are located on the right side of the lifting box (4), the two supporting seats (15) are respectively and detachably installed on one sides, close to each other, of the two hydraulic rods (14), the four rolling wheels (16) are respectively and rotatably installed on the two supporting seats (15) and are symmetrically distributed in pairs, and the four rolling wheels (16) are of a round table-shaped structure and smooth in side face.

7. The rolling device for closing in a plunger according to claim 6, wherein: the cooling mechanism comprises a fixing plate (17), a water tank (18), an exhaust fan (19), an air inlet pipe (20), a filter box (21), an exhaust fan (22), an air outlet pipe (23) and an air outlet cover (24), wherein the fixing plate (17) is fixedly arranged on the inner wall of the right side of the working box (3), the water tank (18) and the exhaust fan (19) are fixedly arranged at the top of the fixing plate (17), the exhaust fan (19) is positioned on the left side of the water tank (18), the air inlet pipe (20) is fixedly arranged at the air inlet end of the exhaust fan (19), one end of the air inlet pipe (20) is far away from the exhaust fan (19) and extends to the outside of the working box (3), the filter box (21) is detachably arranged at one end of the air inlet pipe (20) which is positioned outside the working box (3), the exhaust fan (22) is fixedly arranged at the end of the exhaust fan (19), one end of the exhaust fan (22) is far away from the liquid surface of the water tank (18), the air outlet pipe (23) is fixedly arranged at the air outlet end of the water tank (23), and the air outlet pipe (23) is fixedly arranged at the left side of the air outlet pipe (23).

8. The rolling device for closing in a plunger according to claim 7, wherein: the cooling device is characterized in that a refrigerating plate (25) is fixedly arranged on the inner wall of the bottom of the water tank (18), a copper sheet (26) is fixedly arranged at one end of the exhaust pipe (22) positioned in the water tank (18), and a plurality of air holes distributed in an annular array are formed in the copper sheet (26).

9. The rolling device for closing in a plunger according to claim 7, wherein: the temperature sensor (27) located at the rear side of the plunger assembly is fixedly installed on the inner wall of the rear side of the working box (3), the temperature display screen (28) is fixedly installed on the outer wall of the front side of the working box (3), and the air outlet (29) is formed in the right side of the working box (3).

10. A rolling device for closing in a plunger according to claim 9, wherein: the front side of the working box (3) is provided with an access hole positioned below the temperature display screen (28), a box door (30) is rotatably arranged on the access hole, and an observation window is arranged on the box door (30).