CN212601173U - Automatic feeding mechanism of round bar end face flat grinding chamfering machine - Google Patents

Abstract

The utility model discloses an automatic feed mechanism of round bar terminal surface flat grinding beveler, branch including two sets of intervals setting, install the angle adjusting device on branch, be located the length adjusting device who is connected between two sets of branches and with angle adjusting device, the lower silo of slope installation on length adjusting device, install storage case and the switching device of neighbouring storage case below silo of silo upper end under, the silo includes that the interval is installed on length adjusting device and two sets of supporting seats that set up relatively and install respectively on two sets of supporting seats and be used for carrying two sets of guide rails of round bar, the bottom of storage case is provided with the opening, switching device can open or close the opening. The utility model discloses a silo carries the round bar in with the storage box down and carries out terminal surface mill flat and chamfer processing to the beveler in, has realized the automatic feed function of beveler, and factor of safety is high, and feed mode is stable, and is easy and simple to handle, staff's low in labor strength, work efficiency is high.

Description

Automatic feeding mechanism of round bar end face flat grinding chamfering machine

Technical Field

The utility model relates to a beveler technical field, concretely relates to automatic feed mechanism of round bar terminal surface flat grinding beveler.

Background

The chamfering machine is a small-sized precision machine tool which is specially used for manufacturing dies, hardware machinery, machine tool, hydraulic parts, valves and the like, chamfering of textile machinery, milling, planing and the like. The rapid chamfering by adopting a machine is a trend of development of the mechanical industry. The round bar chamfering machine overcomes the processing defects of the existing mechanical and electric tools, has the advantages of convenience, rapidness and accuracy, and is the best choice for chamfering and cutting metal objects at present. However, in the prior art, the feeding process of the round bar chamfering machine needs to be manually completed, and for workpieces with small weight, workers need to manually feed and position the round bar chamfering machine, so that the operation process is dangerous, the safety coefficient is low, the labor intensity is high, the working efficiency is not high, and for workpieces with heavy weight, the conveying tools such as a trolley and a crane need to be used, so that the occupied space is large, the working environment is disordered, and the working efficiency is low.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an automatic feed mechanism of round bar terminal surface flat grinding beveler realizes the automatic feeding function of round bar beveler, improves work efficiency.

To achieve the purpose, the utility model adopts the following technical proposal:

the automatic feeding mechanism comprises two groups of supporting rods arranged at intervals, an angle adjusting device arranged on the supporting rods, a length adjusting device positioned between the two groups of supporting rods and connected with the angle adjusting device, a discharging groove obliquely arranged on the length adjusting device through a first connecting piece, a storage box arranged at the upper end of the discharging groove and an opening and closing device arranged below the discharging groove and close to the storage box, wherein the discharging groove comprises two groups of supporting seats arranged on the length adjusting device at intervals and oppositely and two groups of guide rails respectively arranged on the two groups of supporting seats and used for conveying round bars, the distance between the two groups of guide rails is smaller than the length of the round bars, the distance between the two groups of supporting seats is larger than the length of the round bars, and the bottom end of the storage box is provided with an opening, the opening and closing device can open or close the opening, the angle adjusting device can adjust the inclination angle of the blanking groove, and the length adjusting device can adjust the distance between the two groups of supporting seats.

As an optimal scheme of an automatic feeding mechanism of a round bar end face flat grinding chamfering machine, each group of guide rails comprises a pressing part guide rail and a supporting guide rail which are arranged on the supporting seat at an upper and lower interval, the distance between the supporting guide rail and the pressing part guide rail is the same as the diameter of a round bar, the supporting guide rail extends to one end, away from the supporting seat, of the storage box along the length direction of the supporting seat, and the pressing part guide rail extends to one end, close to the supporting seat, of the storage box along the length direction of the supporting seat.

As an optimal scheme of an automatic feeding mechanism of a round bar end face flat grinding chamfering machine, each group of the supporting rods comprises first supporting rods and second supporting rods, the first supporting rods and the second supporting rods are arranged along the length direction of the lower trough at intervals, the angle adjusting device comprises first connecting blocks arranged on the first supporting rods, second connecting blocks connected with the first connecting blocks through first pin joint shafts, third connecting blocks arranged on the second supporting rods and fourth connecting blocks connected with the third connecting blocks through second pin joint shafts, and the second connecting blocks and the fourth connecting blocks are all connected with the length adjusting device.

As an optimal scheme of an automatic feeding mechanism of the round bar end face flat grinding chamfering machine, the first connecting piece comprises a plurality of sliding seats which are respectively installed on the outer sides of the two groups of supporting seats, and the sliding seats are arranged at intervals along the length direction of the supporting seats.

As an optimal scheme of an automatic feeding mechanism of a round bar end face flat grinding chamfering machine, the length adjusting device comprises a first positioning rod, a second positioning rod and a driving device, the first positioning rod is connected with the second connecting block through the sliding seat, the second positioning rod is connected with the fourth connecting block through the sliding seat, the supporting seat is connected with the driving device, the driving device is used for driving the supporting seat to move in the length direction of the first positioning rod and the second positioning rod so as to adjust the distance between the two supporting seats.

As an optimal scheme of an automatic feeding mechanism of a round bar end face flat grinding chamfering machine, the driving device comprises a first fixing seat, a lead screw and a hand wheel, wherein the first fixing seat is sleeved on the first positioning rod and the second positioning rod respectively, the lead screw is located between the first positioning rod and the second positioning rod and penetrates through the first fixing seat and is connected with the sliding seat in a transmission mode, and the hand wheel is installed at one end, far away from the supporting seat, of the lead screw.

The automatic feeding mechanism of the round bar end face flat grinding chamfering machine further comprises a locking device, and the locking device is installed on one side, close to the hand wheel, of the first fixing seat and connected with the screw rod.

As an optimal scheme of an automatic feeding mechanism of a round bar end face flat grinding chamfering machine, the opening and closing device comprises a storage box opening, two groups of cylinders below the supporting seat and two inserting rods arranged on the two groups of cylinders respectively, the supporting seat corresponds to the position of each inserting rod, a first through hole is formed in the position of each supporting guide rail corresponding to the first through hole, and the cylinders can drive the inserting rods to sequentially pass through the first through holes and the second through holes to move upwards to the openings of the storage box.

As a preferred scheme of an automatic feeding mechanism of a round bar end face flat grinding chamfering machine, the supporting seat comprises a first supporting plate and a second supporting plate, the first supporting plate is perpendicular to the first positioning rod and the second positioning rod, the first supporting plate is arranged on the sliding seat, the second supporting plate is perpendicularly connected with the first supporting plate, the supporting guide rail is arranged on the first supporting plate, and the pressing piece guide rail is arranged on the second supporting plate through a second connecting piece.

As a preferred scheme of an automatic feeding mechanism of a round bar end face flat grinding chamfering machine, the second connecting piece comprises a plurality of second fixing seats installed on the second supporting plate at intervals, a screw rod sequentially penetrating through the second fixing seats and the pressing piece guide rail and locked through a first nut, a spring and a second nut, the spring and the second nut are located between the second fixing seats and the pressing piece guide rail, the spring is sleeved on the screw rod, and the second nut is located below the spring and in threaded connection with the screw rod.

The utility model has the advantages that: the utility model adopts the blanking groove to convey the round bar stock in the stock box to the round bar stock end surface flat grinding chamfering machine for end surface flat grinding and chamfering, wherein the angle adjusting device can adjust the inclination angle of the blanking groove and further adjust the speed of the round bar stock automatically sliding down, the length adjusting device can adjust the distance between two groups of supporting seats to adapt to the round bar stocks with different lengths, and the distance between the pressing piece guide rail and the supporting guide rail is adjusted by the spring and the nut on the screw rod to adapt to the round bar stocks with different diameters, thereby improving the applicability of the automatic feeding mechanism, and the switching device can cut off or communicate the stock box and the blanking groove by controlling the lifting of the inserted bar, thereby controlling the switching of the automatic feeding mechanism, the structure is simple, the operation is convenient, the utility model realizes the automatic feeding function of the round bar stock chamfering machine, and the manual feeding positioning of staff is not needed, the safety factor is high, the feeding mode is stable, the operation is simple and convenient, the labor intensity of workers is reduced, and the working efficiency is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below. It is obvious that the drawings described below are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be obtained from these drawings without inventive effort.

Fig. 1 is a schematic structural view of an automatic feeding mechanism of a round bar end face flat grinding chamfering machine according to an embodiment of the present invention.

Fig. 2 is a top view of an automatic feeding mechanism of a round bar end face flat grinding chamfering machine according to an embodiment of the present invention.

Fig. 3 is a front view of an automatic feeding mechanism of a round bar end face flat grinding chamfering machine according to an embodiment of the present invention.

Fig. 4 is a rear view of an automatic feeding mechanism of a round bar end face flat grinding chamfering machine according to an embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a closing device according to an embodiment of the present invention.

Fig. 6 is a schematic structural diagram of a second connecting member according to an embodiment of the present invention.

In fig. 1 to 6:

1. a strut; 11. a first support bar; 12. a second support bar;

2. an angle adjusting device; 21. a first connection block; 22. a second connecting block; 23. a third connecting block; 24. a fourth connecting block;

3. a length adjustment device; 31. a first positioning rod; 32. a second positioning rod; 33. a drive device; 331. a first fixed seat; 332. a screw rod; 333. a hand wheel;

4. a first connecting member;

5. a discharging groove; 51. a supporting seat; 511. a first support plate; 512. a second support plate; 513. a second connecting member; 5131. a second fixed seat; 5132. a first nut; 5133. a screw; 5134. a spring; 5135. a second nut; 52. a guide rail; 521. a pressing member guide rail; 522. supporting the guide rail;

6. a material storage box;

7. an opening and closing device; 71. a cylinder; 72. inserting a rod;

8. and (4) a locking device.

Detailed Description

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "inner", "outer", etc. are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not indicated or implied that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are used only for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms will be understood by those skilled in the art according to the specific circumstances.

In the description of the present invention, unless otherwise explicitly specified or limited, the term "connected" or the like, if appearing to indicate a connection relationship between the components, is to be understood broadly, for example, as being either a fixed connection, a detachable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through one or more other components or may be in an interactive relationship with one another. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1 to 4, an automatic feeding mechanism of a round bar end surface flat grinding chamfering machine according to an embodiment of the present invention includes two sets of support rods 1 arranged at an interval, an angle adjusting device 2 installed on the support rods 1, a length adjusting device 3 located between the two sets of support rods 1 and connected to the angle adjusting device 2, a discharging chute 5 obliquely installed on the length adjusting device 3 through a first connecting member 4, a storage tank 6 installed at an upper end of the discharging chute 5, and an opening and closing device 7 installed below the discharging chute 5 adjacent to the storage tank 6, wherein the discharging chute 5 includes two sets of support seats 51 installed at an interval on the length adjusting device 3 and oppositely arranged, and two sets of guide rails 52 installed on the two sets of support seats 51 respectively for conveying round bars, a distance between the two sets of guide rails 52 is smaller than a length of a round bar, and a distance between the two sets of support seats 51 is larger than the length of the round, the opening and closing device 7 can open or close the opening.

This embodiment adopts silo 5 to carry the round bar in the storage case 6 to carry out the terminal surface and grind flat and chamfer processing in the round bar terminal surface flat grinding beveler down, wherein the inclination of silo 5 and then the automatic speed that glides of adjustment round bar can be adjusted down to angle adjusting device 2, length adjusting device 3 can adjust the distance between two sets of supporting seats 51 in order to adapt to the round bar of different length, thereby improve automatic feed mechanism's suitability, and switching device 7 feeds in through storage case 6 and silo 5 through cutting off or intercommunication and control automatic feed mechanism's switching, moreover, the steam generator is simple in structure, and convenient for operation, this embodiment has realized the automatic feed function of round bar terminal surface flat grinding beveler, it fixes a position to need not staff's manual material loading, the factor of safety is high, and the feeding mode is stable, and is easy and simple to handle, the labor intensity of staff has been reduced, and the work.

As a preferred embodiment of the utility model, every group guide rail 52 is including installing on supporting seat 51 and casting die guide rail 521 and the supporting rail 522 that the interval set up from top to bottom, distance between supporting rail 522 and the casting die guide rail 521 is the same with the diameter of round bar, supporting rail 522 extends to the one end that supporting seat 51 was kept away from to storage tank 6 along the length direction of supporting seat 51, casting die guide rail 521 extends to the one end that storage tank 6 is close to supporting seat 51 along the length direction of supporting seat 51, round bar falls to the back from the opening of feed chute 5 and gets into along casting die guide rail 521 free gliding to round bar terminal surface flat grinding beveler, and the distance between supporting rail 522 and the casting die guide rail 521 just satisfies a round bar and passes through, prevent a plurality of round bar from appearing and get into round bar terminal surface flat grinding beveler simultaneously.

In this embodiment, each set of support rods 1 includes a first support rod 11 and a second support rod 12 spaced along the length direction of the feeding chute 5, the angle adjusting device 2 includes a first connecting block 21 installed on the first support rod 11, a second connecting block 22 connected to the first connecting block 21 via a first pivot shaft, a third connecting block 23 installed on the second support rod 12, and a fourth connecting block 24 connected to the third connecting block 23 via a second pivot shaft, both the second connecting block 22 and the fourth connecting block 24 are connected to the length adjusting device 3, the second connecting block 22 can rotate relative to the first connecting block 21, the fourth connecting block 24 can rotate relative to the third connecting block 23, when the second connecting block 22 and the fourth connecting block 24 rotate, the position of the feeding chute 5 on the length adjusting device 3 changes accordingly, in this embodiment, the inclination angle of the feeding chute 5 can be adjusted, further adjusting the blanking speed of the round bar stock.

In this embodiment, the first connecting member 4 includes a plurality of sliders respectively mounted on the outer sides of the two sets of supporting seats 51, and the sliders are disposed at intervals along the length direction of the supporting seats 51.

In this embodiment, the length adjustment device 3 includes a first positioning rod 31 passing through the sliding seat and connected to the two second connection blocks 22, a second positioning rod 32 passing through the sliding seat and connected to the two fourth connection blocks 24, and a driving device 33 connected to the supporting seat 51 through the sliding seat and sleeved on the first positioning rod 31 and the second positioning rod 32, respectively, the sliding seat can slide on the first positioning rod 31 and the second positioning rod 32, and the driving device 33 can drive the supporting seat 51 to move along the length direction of the first positioning rod 31 and the second positioning rod 32 to adjust the distance between the two sets of supporting seats 51.

In this embodiment, the driving device 33 includes a first fixing seat 331 respectively sleeved on the first positioning rod 31 and the second positioning rod 32, a screw rod 332 located between the first positioning rod 31 and the second positioning rod 32 and passing through the first fixing seat 331 to be in transmission connection with the sliding seat, and a hand wheel 333 installed at one end of the screw rod 332 far away from the supporting seat 51, in this embodiment, a group of supporting seats 51 far away from the hand wheel 333 is fixed, and a group of supporting seats 51 close to the hand wheel 333 moves along the screw rod 332 under the driving action of manually rotating the hand wheel 333, so as to adjust the distance between the two groups of supporting seats 51 to adapt to round bars with different lengths, and the distance between the two groups of supporting seats 51 is smaller than the length of.

The automatic feeding mechanism of the round bar end face flat grinding chamfering machine in the embodiment further comprises a locking device 8, the locking device 8 is installed on one side, close to the hand wheel 333, of the first fixing seat 331 and connected with the screw rod 332, and after the supporting seat 51 is driven by the screw rod 332 to move to a specified position, the locking device 8 can clamp the screw rod 332 to prevent movement, so that the stability of the automatic feeding mechanism in the feeding process is ensured.

As shown in fig. 5, the opening and closing device 7 includes two sets of air cylinders 71 located below the opening of the storage box 6 and installed below the two sets of supporting seats 51, and two insertion rods 72 respectively installed on the two sets of air cylinders 71, wherein a first through hole is opened at a position of the supporting seat 51 corresponding to the insertion rod 72, a second through hole is opened at a position of the supporting rail 522 corresponding to the first through hole, and the air cylinders 71 can drive the insertion rods 72 to move upwards to the opening of the storage box 6 sequentially through the first through hole and the second through hole. The opening and closing device 7 in this embodiment can drive the insertion rod 72 to ascend and descend by the control cylinder 71 so as to partition or communicate the storage box 6 and the feed chute 5, thereby controlling the opening and closing of the automatic feeding mechanism.

In this embodiment, the supporting seat 51 includes a first supporting plate 511 mounted on the sliding seat perpendicular to the first positioning rod 31 and the second positioning rod 32, and a second supporting plate 512 vertically connected to the first supporting plate 511, a supporting rail 522 is mounted on the first supporting plate 511, a pressing member rail 521 is mounted on the second supporting plate 512 through a second connecting member 513, and the distance between the two second supporting plates 512 is greater than the length of the round bar.

As shown in fig. 6, the second connecting member 513 includes a plurality of second fixing seats 5131 installed at intervals on the second support plate 512, a screw 5133 sequentially passing through the second fixing seats 5131 and the pressing member guide rail 521 and locked by a first nut 5132, a spring 5134 and a second nut 5135 located between the second fixing seats 5131 and the pressing member guide rail 521, the spring 5134 being sleeved on the screw 5133, the second nut 5135 being located below the spring 5134 and being spirally connected with the screw 5133, the distance between the pressing member guide rail 521 and the support guide rail 522 being adjustable by the spring 5134 on the screw 5133, the first nut 5132 and the second nut 5135, and the second nut 5135 being screwed to press the spring 5134 to adjust the height of the pressing member guide rail 521, and then being locked by the first nut 5132, so as to adapt to round bars with different diameters.

It should be understood that the above-described embodiments are merely illustrative of the preferred embodiments of the present invention and the technical principles thereof. It will be understood by those skilled in the art that various modifications, equivalents, changes, and the like can be made to the present invention. However, these modifications are within the scope of the present invention as long as they do not depart from the spirit of the present invention. In addition, certain terms used in the specification and claims of the present application are not limiting, but are used merely for convenience of description.

Claims (10)

1. An automatic feeding mechanism of a round bar end face flat grinding chamfering machine is characterized by comprising two groups of supporting rods (1) arranged at intervals, an angle adjusting device (2) arranged on the supporting rods (1), a length adjusting device (3) positioned between the two groups of supporting rods (1) and connected with the angle adjusting device (2), a lower trough (5) obliquely arranged on the length adjusting device (3) through a first connecting piece (4), a storage box (6) arranged at the upper end of the lower trough (5) and an opening and closing device (7) adjacent to the storage box (6) and arranged below the lower trough (5), wherein the lower trough (5) comprises two groups of supporting seats (51) which are arranged on the length adjusting device (3) at intervals and are oppositely arranged and two groups of guide rails (52) which are respectively arranged on the two groups of supporting seats (51) and are used for conveying round bars, the distance between the two groups of guide rails (52) is smaller than the length of the round bar, the distance between the two groups of supporting seats (51) is larger than the length of the round bar, an opening is formed in the bottom end of the storage box (6), the opening can be opened or closed by the opening and closing device (7), the angle adjusting device (2) can adjust the inclination angle of the blanking groove (5), and the length adjusting device (3) can adjust the distance between the two groups of supporting seats (51).

2. The automatic feeding mechanism of the round bar end face flat grinding chamfering machine according to claim 1, wherein each set of guide rails (52) comprises a pressing piece guide rail (521) and a support guide rail (522) which are installed on the supporting seat (51) and are arranged at intervals up and down, the distance between the support guide rail (522) and the pressing piece guide rail (521) is the same as the diameter of the round bar, the support guide rail (522) extends to one end of the storage box (6) far away from the supporting seat (51) along the length direction of the supporting seat (51), and the pressing piece guide rail (521) extends to one end of the storage box (6) near the supporting seat (51) along the length direction of the supporting seat (51).

3. The automatic feeding mechanism of the round bar end face flat grinding chamfering machine according to claim 2, wherein each group of the supporting rods (1) comprises a first supporting rod (11) and a second supporting rod (12) which are arranged at intervals along the length direction of the blanking groove (5), the angle adjusting device (2) comprises a first connecting block (21) installed on the first supporting rod (11), a second connecting block (22) connected with the first connecting block (21) through a first pivot shaft, a third connecting block (23) installed on the second supporting rod (12) and a fourth connecting block (24) connected with the third connecting block (23) through a second pivot shaft, and the second connecting block (22) and the fourth connecting block (24) are both connected with the length adjusting device (3).

4. The automatic feeding mechanism of the round bar end face flat grinding chamfering machine according to claim 3, wherein said first connecting member (4) comprises a plurality of sliding seats respectively installed at the outer sides of two sets of said supporting seats (51), said sliding seats being arranged at intervals along the length direction of said supporting seats (51).

5. The automatic feeding mechanism of the round bar end face flat grinding chamfering machine according to claim 4, wherein the length adjusting device (3) comprises a first positioning rod (31) passing through the sliding seat and connected with the two second connecting blocks (22) respectively, a second positioning rod (32) passing through the sliding seat and connected with the two fourth connecting blocks (24) respectively, and a driving device (33) connected with the supporting seat (51) through the sliding seat and sleeved on the first positioning rod (31) and the second positioning rod (32) respectively, the driving device (33) can drive the supporting seat (51) to move along the length direction of the first positioning rod (31) and the second positioning rod (32) to adjust the distance between the two groups of the supporting seats (51).

6. The automatic feeding mechanism of the round bar end face flat grinding chamfering machine according to claim 5, wherein the driving device (33) comprises a first fixing seat (331) respectively sleeved on the first positioning rod (31) and the second positioning rod (32), a screw rod (332) located between the first positioning rod (31) and the second positioning rod (32) and passing through the first fixing seat (331) to be in transmission connection with the sliding seat, and a hand wheel (333) installed at one end of the screw rod (332) far away from the supporting seat (51).

7. The automatic feeding mechanism of the round bar end face flat grinding and chamfering machine according to claim 6, characterized by further comprising a locking device (8), wherein the locking device (8) is installed on one side of the first fixing seat (331) close to the hand wheel (333) and connected with the screw rod (332).

8. The automatic feeding mechanism of the round bar end face flat grinding chamfering machine according to claim 2, characterized in that the opening and closing device (7) comprises two sets of cylinders (71) which are located below the opening of the storage box (6) and mounted below two sets of supporting seats (51) and two insert rods (72) which are respectively mounted on the two sets of cylinders (71), a first through hole is formed in the position of the supporting seat (51) corresponding to the insert rod (72), a second through hole is formed in the position of the supporting guide rail (522) corresponding to the first through hole, and the cylinder (71) can drive the insert rod (72) to sequentially pass through the first through hole and the second through hole and move upwards to the opening of the storage box (6).

9. The automatic feeding mechanism of the round bar end face flat grinding chamfering machine according to claim 5, wherein said supporting base (51) comprises a first supporting plate (511) mounted on said slide perpendicularly to said first positioning rod (31) and said second positioning rod (32) and a second supporting plate (512) perpendicularly connected to said first supporting plate (511), said supporting rail (522) is mounted on said first supporting plate (511), and said pressing member rail (521) is mounted on said second supporting plate (512) by a second connecting member (513).

10. The automatic feeding mechanism of the round bar end face flat grinding and chamfering machine as claimed in claim 9, wherein said second connecting member (513) comprises a plurality of second fixing seats (5131) mounted on said second supporting plate (512) at intervals, a screw (5133) sequentially passing through said second fixing seats (5131) and said pressing piece guide rail (521) and locked by a first nut (5132), a spring (5134) and a second nut (5135) between said second fixing seats (5131) and said pressing piece guide rail (521), said spring (5134) being sleeved on said screw (5133), said second nut (5135) being located below said spring (5134) and being screw-connected with said screw (5133).

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