CN220201409U - Automatic oiling conveying mechanism of filling machine - Google Patents

Abstract

The utility model relates to the technical field of lubricating liquid production, in particular to an automatic oiling and conveying mechanism of a filling machine, which comprises a machine body, a filling structure and a positioning and conveying structure, wherein the filling structure comprises a fixed plate, a supporting rod, a mounting seat and a filling nozzle; the positioning and conveying structure comprises a filling area, a sealing cover area, a positioning frame and a driving piece, wherein the filling area is also provided with a filling plate and a weighing sensor; the positioning frame is arranged on the machine body through the driving piece; the positioning frame comprises a positioning plate, a central plate and a moving plate; the moving plate is kept to be adjustable left and right through the sliding piece and the positioning plate so as to adapt to oil barrels with different specifications and sizes; the driving piece is configured to adjust the positioning frame to adapt to the size of the oil drum and keep the filling nozzle consistent with the upper center and the lower center of the oil drum, and drive the filled oil drum to move from the canning area to the capping area. The oil filling device is reasonable in structural design, operation steps are saved, automatic and efficient filling and conveying are realized, secondary repeated filling is avoided, and oil filling production efficiency is improved.

Description

Automatic oiling conveying mechanism of filling machine

Technical Field

The utility model relates to the technical field of oil production and lubricating oil filling, in particular to an automatic oiling and conveying mechanism of a filling machine.

Background

Lubricating oil is a technology intensive product and is a complex mixture of hydrocarbon compounds, and mainly plays roles of lubrication, cooling, rust prevention, cleaning, sealing, buffering and the like. In the oil production process of lubricating oil and the like, the filling link is particularly complex, and the efficiency of mass production of lubricating oil, antifreezing solution and the like is determined. The traditional filling machine is simple in structure, the height of the filling nozzle is not adjustable, and the function is single. Namely, a manual auxiliary operation mode is adopted, and the working procedures comprise the following steps: the worker takes the oil drum to wait for filling of the previous oil drum, and places the oil drum to be filled on one side of the workbench; then the filled oil drum is moved to the next working procedure; finally, the oil barrel to be filled is obliquely aligned with the oil nozzle to be placed in the filling area, the whole operation mode is time-consuming and labor-consuming, and the working personnel are required to be careful, so that the oil filling errors are avoided. The traditional oil filling machine has the advantages that the number of filling oil barrels per day in a workshop is 30-40, and the operation efficiency of oil production and filling is severely restricted.

Furthermore, the oil filling machine in the prior art is not intelligent enough; namely, the phenomenon of secondary repeated filling is extremely easy to occur in the oil filling process of a factory workshop. When carrying out fluid filling operation to the oil drum, the staff is through trampling oiling switch control fluid oiling, because tiger is great or maloperation, very easily tramples the oiling switch again when not placing new oil drum after the fluid filling, and the fluid filling machine can annotate again this moment, causes fluid large tracts of land to spray, can not only pollute staff's clothes and mesa clean and tidy, and the workstation clearance is very troublesome moreover, takes time 30-50min at least, wastes time and energy, greatly reduced fluid production filling's efficiency and security.

Disclosure of Invention

In order to solve the defects and the shortcomings of the prior art in oil filling, the utility model provides the automatic oiling and conveying mechanism of the filling machine, which has the advantages of reasonable structural design, operation step saving, automatic and efficient filling and conveying, secondary repeated filling prevention and oil filling production efficiency improvement.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the automatic oiling and conveying mechanism of the filling machine comprises a machine body, a filling structure and a positioning and conveying structure, wherein the machine body is distributed left and right, and a workbench distributed left and right is also vertically arranged at the lower part of the machine body; the filling structure comprises a fixed plate, a supporting rod, a mounting seat and a filling nozzle; the fixed plates are distributed left and right and are arranged in the machine body in a vertically movable way through the moving part; the support rod is arranged on the fixing plate through a connecting rod and is positioned on the outer side of the machine body, and the support rod is parallel to the fixing plate; the mounting seat is arranged on the supporting rod in a left-right movable manner; the filling nozzle is fixedly arranged on the mounting seat and is connected with an external oil source through a filling pipe; the mounting seat, the filling nozzle and the oil filling pipe are at least one group which is installed in an adapting way;

the positioning and conveying structure comprises a filling area, a sealing cover area, a positioning frame and a driving piece, wherein the filling area and the sealing cover area are respectively arranged on the left side and the right side of the workbench, and the filling area is also provided with a filling plate and a weighing sensor arranged at the bottom end of the filling plate; the positioning frame is arranged on the machine body through the driving piece; the positioning frame comprises a positioning plate, a central plate and a moving plate; the positioning plate is connected with the connecting arm, and the central plate is arranged in the center of the positioning plate and has a thickness of 5mm; the movable plates are two symmetrically distributed left and right, and each movable plate is kept to be adjustable left and right through a sliding piece and a positioning plate so as to be suitable for oil barrels with different specifications and sizes; the driving piece is configured to adjust the size of the positioning frame to be matched with the oil drum, keep the upper center and the lower center of the filling nozzle consistent with the upper center and the lower center of the oil drum, and drive the filled oil drum to move from the canning area to the sealing area.

Preferably: the moving part comprises a driving motor, a driving screw and a fixed block; the driving motor is arranged on the machine body through a bracket, the fixed block is arranged on the machine body and positioned above the driving motor, one end of the driving screw rod is connected with the driving motor, and the other end of the driving screw rod is arranged on the fixed block in a relatively rotatable manner; the fixed plate is arranged on the driving screw rod, and the fixed plate and the driving screw rod can rotate relatively.

Further preferably: a pedal switch is also arranged at the bottom end of the machine body; the left side of the front of the machine body is also provided with a control switch, and the right side of the front of the machine body is also provided with a storage chamber which is provided with a sealing cover; the storage chamber is arranged corresponding to the sealing cover area.

Further preferably: the oil filling pipe is also provided with a pneumatic valve which is respectively and electrically connected with the control switch, the pedal switch and the weighing sensor, and the pneumatic valve is forcibly closed after the oil drum is filled.

Further preferably: the driving piece comprises a first cylinder, a driving seat, a second cylinder and a connecting arm; the first cylinders are arranged on the machine body in a left-right distribution manner; the driving seat is arranged on the machine body and is connected with the first air cylinder so as to drive the driving seat to move left and right relative to the machine body; the second cylinders are arranged on the driving seat in a front-back distribution mode, one end of the connecting arm is connected with the second cylinders, and the other end of the connecting arm is connected with the locating frame.

Further preferably: the sliding piece comprises a sliding plate, a sliding groove and a fastening bolt; the sliding plate is arranged on the moving plate, and the sliding plate and the moving plate are integrally formed; the sliding grooves are formed in the positioning plate in a left-right distribution mode, and the fastening bolts penetrate through the sliding plate and the sliding grooves and keep the sliding plate fastened with the positioning plate.

Compared with the prior art, the utility model has the advantages that: the intelligent quantitative filling machine is reasonable in structural design, the filling area and the sealing area are intelligently divided and arranged on the workbench, and the weighing sensor is arranged in the filling area to perform weight detection, so that the effects of preventing wrong oil drum taking and secondary filling are achieved, and the intelligent quantitative filling is achieved; when the weighing sensor in the filling area detects that the preset value is reached, the third pneumatic valve connected with the filling nozzle is forcibly closed, and even if a worker presses the pedal switch for the second time, the third pneumatic valve still keeps closed, so that the problem of waste of oil spraying caused by the secondary filling of the worker is avoided;

the positioning frame is further intelligently adjusted in width so as to adapt to oil barrels of different specifications and models, so that the initial positioning position of the oil barrels is guaranteed, meanwhile, in order to avoid oil spraying splashing, a driving motor, a driving screw and a fixing block are arranged to cooperate to drive the lifting of the filling nozzle, so that the safe and stable placement of the oil barrels is guaranteed, and the corresponding relation and the fitting degree between the filling nozzle and an inlet of the oil barrels are also guaranteed; on the basis of intelligent quantitative oil safe filling, the filled oil drum is driven to move to a filling area by the action of the driving piece, so that the operation steps of oil filling are saved, workers only need to take and put the drum, the operation is simple, the safety and reliability are improved from the traditional filling of 30-40 cases/day to the current 180-200 cases/day; greatly improves the operation efficiency of oil filling production; and guarantee that the one-time flexible motion cycle of cylinder equals the time sum of oil drum filling plus the locating rack removes to the time that the closing cap district resets from the filling district, so realized the purpose of automatic filling of fluid and carrying to the next process, lubricating oil production canning oiling efficiency is higher.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the utility model, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.

Fig. 1 is a perspective view of the overall structure of the present utility model.

Fig. 2 is an enlarged view of the a portion structure in fig. 1.

Fig. 3 is a perspective view of the moving member of the present utility model.

Fig. 4 is a perspective view of the driving member of the present utility model.

Fig. 5 is a schematic view of a positioning frame according to the present utility model.

Fig. 6 is a schematic structural view of the filling area of the present utility model.

In the figure: 1. a body; 2. filling structure; 3. positioning and conveying the structure; 4. a work table; 5. a fixing plate; 6. a support rod; 7. a mounting base; 8. a filling nozzle; 9. a moving member; 10. a connecting rod; 11. a filler tube; 12. a filling area; 13. a capping region; 14. a positioning frame; 15. a driving member; 16. filling plate; 17. a weighing sensor; 18. a positioning plate; 19. a center plate; 20. a moving plate; 21. a slider; 22. a driving motor; 23. driving a screw rod; 24. a fixed block; 25. a pedal switch; 26. a control switch; 27. a storage chamber; 28. a pneumatic valve; 29. a first cylinder; 30. a driving seat; 31. a second cylinder; 32. a connecting arm; 33. a slide plate; 34. a chute; 35. and (5) fastening the bolt.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. 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 be within the scope of the utility model.

It should be noted that in the present embodiment, relational terms such as "first" and "second" and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the phrase "comprising one does not exclude the presence of additional identical elements in a process, method, article, or apparatus that comprises an element, as may occur.

In the description of the present utility model, the terms "mounted," "connected," "coupled," and "provided" as may be used in a broad sense, e.g., as a fixed connection, as a removable connection, or as an integral connection, unless clearly indicated and defined otherwise; can be mechanically or electrically connected; either directly, indirectly through intermediaries, or in communication with the interior of the two elements. The specific meaning of the above terms in the present utility model can be understood by those skilled in the art in specific cases.

Examples: as shown in fig. 1-6:

an automatic oiling and conveying mechanism of a filling machine comprises a machine body 1, a filling structure 2 and a positioning and conveying structure 3, wherein the machine body 1 is distributed left and right, and a pedal switch 25 is further arranged at the bottom end of the machine body 1; the pedal switch is connected with the pneumatic valve, and staff holds two barrels with both hands, realizes pedal oiling through the pedal switch, labour saving and time saving. The left side of the front of the machine body 1 is also provided with a control switch 26, and the control switch comprises a one-key control button for forcedly commanding the equipment switch, a line changing operation button for changing and filling oil and a clear oil operation button for cleaning residual oil in the oil tank. The right side of the front of the machine body is also provided with a storage chamber 27 which is provided with a sealing cover, the depth of the storage chamber is 30-50cm, and 300 covers can be arranged at a time. The storage chamber 27 is arranged corresponding to the cover sealing area 13, and is designed in a reasonable area, so that the operation efficiency of oil filling is improved.

In this embodiment, as shown in fig. 2: the filling structure 2 comprises a fixing plate 5, a supporting rod 6, a mounting seat 7 and a filling nozzle 8. The fixed plates 5 are distributed left and right and are arranged in the machine body 1 in a vertically movable manner through the moving parts 9. Wherein, as shown in fig. 3: the moving member 9 includes a driving motor 22, a driving screw 23, and a fixed block 24. The driving motor 22 is arranged on the machine body 1 through a bracket, the fixed block 24 is arranged on the machine body 1 and positioned above the driving motor 22, one end of the driving screw 23 is connected with the driving motor 22, and the other end of the driving screw is arranged on the fixed block 24 in a relatively rotatable manner; the fixed plate 5 is arranged on the driving screw rod 23, and the two are kept to rotate relatively. Thus, the driving motor is started, and the driving motor rotates forward to drive the driving screw rod to rotate clockwise, so that the fixing plate is driven to move upwards; otherwise, the fixing plate is driven to move downwards.

As shown in fig. 3: the supporting rods 6 are arranged on the fixing plate 5 through connecting rods 10 which are distributed in the front-back direction and are positioned on the outer side of the machine body 1, and the supporting rods 6 are parallel to the fixing plate 5; thus forming a three-in-one structure of the fixing plate, the connecting rod and the supporting rod. The mounting seat 7 is arranged on the supporting rod 6 in a left-right movable way; the support rod is provided with a sliding groove, the mounting seat is provided with a hole, and further the mounting seat and the support rod are fastened by adopting a mode that the fastening bolt penetrates through the mounting seat, meanwhile, the purpose of convenient position adjustment is achieved, and the purpose of filling oil barrels with different specifications and types in an adapting mode is achieved. The filling nozzles 8 are vertically and fixedly arranged on the mounting seat 7 in a distributed manner, and the input end of each filling nozzle 8 is connected with an external oil source through a filling pipe 11. And then through the forward and backward rotation of the driving motor, the fixing plate is driven to move up and down integrally, and the height of the filling nozzle is adjusted adaptively. The mounting seat 7, the filling nozzle 8 and the oil filling pipe 11 are at least one group which is installed in an adapting way; the pneumatic valve 28 is further arranged on the oil filling pipe 11, the pneumatic valve 28 is electrically connected with the control switch 26, the treading switch 25 and the weighing sensor 17 respectively, and after the oil drum is filled, the pneumatic valve 28 is forcibly closed, oil is not discharged even if the treading switch is pressed, so that the problem of secondary filling is avoided.

As shown in fig. 1: in this embodiment, the positioning and conveying structure 3 includes a filling area 12, a capping area 13, a positioning frame 14, and a driving member 15. The lower part of the machine body 1 is also vertically provided with a workbench 4 which is distributed left and right. The filling area 12 and the sealing area 13 are respectively arranged on the left side end face and the right side end face of the workbench 4, and the filling area 12 is also provided with a filling plate 16 and a weighing sensor 17 arranged at the bottom end of the filling plate 16; with particular reference to the structure shown in fig. 6. The position department that the workstation corresponds the filling district is equipped with the recess, and filling plate inlay card installs in the recess, and weighing sensor sets up in the supporting bulge of recess lateral wall for real-time detection filling plate is last object weight, promptly is the oil drum oil filling quantity, and real-time transmission control command signal gives pneumatic valve, carries out intelligent fluid ration filling, still avoids the secondary filling simultaneously.

In the embodiment, the control modes of the starting valve, the control switch and the pedal switch are automatic control realized through a PLC controller; the control circuit and the working principle of the PLC controller can be realized by simple programming by a person skilled in the art, and are common knowledge in the art, and the present application document is mainly used for protecting a mechanical device, so the present application does not explain the control manner and the circuit connection in detail.

In this embodiment, as shown in fig. 1: the positioning frame 14 is disposed on the machine body 1 through the driving member 15. Wherein, as shown in fig. 5: the positioning frame 14 includes a positioning plate 18, a center plate 19, and a moving plate 20. The positioning plate 18 is connected with the driving piece 15, the positioning plates are distributed left and right, and the center plates 19 are arranged in the center of the positioning plate 18 in a front-back distribution manner and have a thickness of 5mm; the purpose that so set up has not only played and has separated two card district of formation, is convenient for place the effect of oil drum, has still avoided weighing sensor's in the filling district left and right sides portion mutual influence simultaneously, improves fluid filling precision. The moving plates 20 are two symmetrically distributed on the positioning plate, and each moving plate 20 and the positioning plate 18 can be kept to be adjusted left and right through the sliding piece 21 so as to adapt to oil barrels with different specifications and sizes. Specifically, the slider 21 includes a slide plate 33, a slide groove 34, and a fastening bolt 35. The sliding plate 33 is disposed on the moving plate 20, and the two are integrally formed; the sliding grooves 34 are formed in the positioning plate 18 in a left-right distributed manner, and the fastening bolts 35 penetrate through the sliding plate 33 and the sliding grooves 34 and keep the sliding plate 33 fastened with the positioning plate 18.

As shown in fig. 4: in this embodiment, the driving member 15 is configured to adjust the size of the positioning frame 14 to be suitable for the oil tank, keep the vertical center of the filling nozzle 8 consistent with the vertical center of the oil tank (the center of the filling port is always at the center of the width of the tank body), and drive the filled oil tank to move from the canning area to the capping area 13. Specifically, the driving member 15 includes a first cylinder 29, a driving seat 30, a second cylinder 31, and a connecting arm 32. The first cylinders 29 are arranged on the machine body 1 in a left-right distributed manner; the driving seat 30 is disposed on the machine body 1 and connected to the first cylinder 29, so as to drive the driving seat 30 to move left and right relative to the machine body 1; the second cylinders 31 are disposed in the driving seat 30 in a front-rear distribution, and one ends of the connecting arms 32 are connected with the second cylinders 31, and the other ends are connected with the positioning plate 18. The front of the machine body is also provided with a through groove which is convenient for the connecting arm to move left and right and a through groove which is convenient for the connecting rod to move up and down. The purpose of this arrangement is to achieve a side-to-side and back-and-forth movement of the positioning frame. The left-right movement is used for conveying the filled oil drum to the next process. The first is to adjust the position of different oil drum sizes for the adaptation, but in order to reset conveniently.

The working process comprises the following steps: in the initial state, the staff needs to adapt and adjust the distance between the two movable plates and the central plate to adapt to the width of the oil drum, the positions of the corresponding two filling nozzles in the left-right direction are also adjusted according to the size of the oil drum, and the oil drum is placed in a filling area, so that the filling nozzles can enter an oil drum inlet when descending. Wherein the position of the barrel body is positioned by the clamping area (namely the area between the movable plate and the central plate) of the positioning frame.

The oil drum is filled with oil through the pedal switch and the pneumatic valve, and the weight is detected in real time through the weighing sensor. After the oil drum is filled with oil, the first cylinder is started to drive the locating rack and the oil drum to integrally move along the workbench, and the locating rack and the oil drum move from the filling area to the sealing area. Then the second cylinder starts, drives the locating rack shrink, avoids having to block with the oil drum when reseing. And next, the first cylinder is started again to drive the positioning frame to reset to the filling area, and the second cylinder is started again to drive the positioning frame to complete the resetting operation. When the oil is filled, the execution command level of the weighing sensor is greater than the execution command level of the trampling switch. The repeated large batch operation that can accomplish fluid filling production fast high efficiency like this, synchronous another staff station position closing cap district, through conveniently taking the closing cap in the storing is indoor to be covered dress, labour saving and time saving has avoided the staff to need all turn around at every turn when traditional operation take the problem that the closing cap is wasted time and energy.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (6)

1. An automatic oiling conveying mechanism of liquid filling machine, its characterized in that: the mechanism comprises a machine body (1), a filling structure (2) and a positioning conveying structure (3), wherein the machine body (1) is distributed left and right, and a workbench (4) distributed left and right is also vertically arranged at the lower part of the machine body (1); the filling structure (2) comprises a fixed plate (5), a supporting rod (6), a mounting seat (7) and a filling nozzle (8); the fixed plates (5) are distributed left and right and are arranged in the machine body (1) in a vertically movable manner through the moving parts (9); the supporting rod (6) is arranged on the fixing plate (5) through a connecting rod (10) and is positioned on the outer side of the machine body (1), and the supporting rod (6) is parallel to the fixing plate (5); the mounting seat (7) is arranged on the supporting rod (6) in a manner of being capable of moving left and right; the filling nozzle (8) is fixedly arranged on the mounting seat (7), and the filling nozzle (8) is connected with an external oil source through a filling pipe (11); the mounting seat (7), the filling nozzle (8) and the oil filling pipe (11) are at least one group which is installed in an adapting way;

the positioning and conveying structure (3) comprises a filling area (12), a sealing cover area (13), a positioning frame (14) and a driving piece (15), wherein the filling area (12) and the sealing cover area (13) are respectively arranged on the left side and the right side of the workbench (4), and the filling area (12) is also provided with a filling plate (16) and a weighing sensor (17) arranged at the bottom end of the filling plate (16); the positioning frame (14) is arranged on the machine body (1) through the driving piece (15); the positioning frame (14) comprises a positioning plate (18), a central plate (19) and a moving plate (20); the positioning plate (18) is connected with the driving piece (15), and the center plate (19) is vertically arranged in the center of the positioning plate (18) and has a thickness of 5mm; the number of the moving plates (20) is two symmetrically distributed left and right, and each moving plate (20) and the positioning plate (18) can be kept to be adjusted left and right through the sliding piece (21) so as to adapt to oil barrels with different specifications and sizes; the driving piece (15) is configured to be capable of adjusting the positioning frame (14) back and forth to adapt to the size of the oil drum, keeping the upper center and the lower center of the filling nozzle (8) consistent with the upper center and the lower center of the oil drum, and driving the filled oil drum to move from the filling area to the sealing cover area (13).

2. An automatic oiling and conveying mechanism of a filling machine as set forth in claim 1, wherein: the moving part (9) comprises a driving motor (22), a driving screw (23) and a fixed block (24); the driving motor (22) is arranged on the machine body (1) through a bracket, the fixed block (24) is arranged on the machine body (1) and is positioned above the driving motor (22), one end of the driving screw (23) is connected with the driving motor (22), and the other end of the driving screw is arranged on the fixed block (24) in a relatively rotatable manner; the fixed plate (5) is arranged on the driving screw rod (23) and can rotate relatively.

3. An automatic oiling and conveying mechanism of a filling machine as set forth in claim 2, wherein: a pedal switch (25) is arranged at the bottom end of the machine body (1); the left side of the front of the machine body (1) is also provided with a control switch (26), and the right side is also provided with a storage chamber (27) filled with a sealing cover; the storage chamber (27) is arranged corresponding to the sealing cover area (13).

4. A filling machine automatic oiling and conveying mechanism as set forth in claim 3, wherein: the oil filling pipe (11) is also provided with a pneumatic valve (28), the pneumatic valve (28) is respectively electrically connected with the control switch (26), the pedal switch (25) and the weighing sensor (17), and the pneumatic valve (28) is forcibly closed after the oil drum is filled.

5. An automatic oiling and conveying mechanism of a filling machine as set forth in claim 4, wherein: the driving piece (15) comprises a first air cylinder (29), a driving seat (30), a second air cylinder (31) and a connecting arm (32); the first cylinders (29) are arranged on the machine body (1) in a left-right distributed manner; the driving seat (30) is arranged on the machine body (1) and is connected with the first air cylinder (29) so as to drive the driving seat (30) to move left and right relative to the machine body (1); the second air cylinders (31) are arranged on the driving seat (30) in a front-back distributed mode, one ends of the connecting arms (32) are connected with the second air cylinders (31), and the other ends of the connecting arms are connected with the positioning plates (18).

6. An automatic oiling and conveying mechanism of a filling machine as set forth in claim 5, wherein: the sliding piece (21) comprises a sliding plate (33), a sliding groove (34) and a fastening bolt (35); the sliding plate (33) is arranged on the moving plate (20) and is integrally formed with the moving plate; the sliding grooves (34) are formed in the positioning plate (18) in a left-right distributed mode, and the fastening bolts (35) penetrate through the sliding plate (33) and the sliding grooves (34) and keep the sliding plate (33) fastened with the positioning plate (18).