CN217493717U - Automatic chamfering machine for processing splitting prism - Google Patents

Abstract

The utility model discloses an automatic chamfering machine of beam splitting prism processing usefulness, including base, front and back slide mechanism, rotary mechanism, fixed establishment, side-to-side slide mechanism and chamfer mechanism, the symmetrical rigid coupling of front and back both sides of the upper surface of base has the riser, front and back slide mechanism sets up between the riser, rotary mechanism sets up the top at front and back slide mechanism, fixed establishment sets up the top at rotary mechanism, the symmetrical rigid coupling of upper surface left and right sides of base has the backup pad, side-to-side slide mechanism sets up between the top of backup pad, side-to-side slide mechanism's below fixed mounting has the lift cylinder, chamfer mechanism passes through lift cylinder and side-to-side slide mechanism fixed connection; the beneficial effects of the utility model are that, the utility model discloses can carry out the chamfer to the edge of different angles on the beam splitter prism and polish, need not to change other auxiliary members to accelerated the efficiency of chamfer, the fixed establishment of setting can have better stability when beam splitter prism polishes.

Description

Automatic chamfering machine for processing splitting prism

Technical Field

The utility model relates to a prism processing technology field, concretely relates to automatic beveler of beam splitting prism processing usefulness.

Background

Prism, a transparent object enclosed by two intersecting planes that are not parallel to each other, for splitting or dispersing light beams. The prism is a polyhedron made of transparent materials (such as glass, crystal and the like). The method is widely applied to optical instruments. The prism can be divided into several kinds according to its properties and uses. For example, in spectroscopy instruments, a "dispersive prism" which decomposes the composite light into a spectrum, more commonly an equilateral triangular prism; in the instruments such as periscope, binocular etc., the direction of light is changed to adjust the imaging position, which is called as "total reflection prism", a right-angle prism is generally adopted, and in the prism production process, each edge of the prism is usually required to be chamfered to remove the corresponding sharp edge.

For example, a prism chamfering device disclosed in patent with publication number CN211916356U relates to the technical field of optical prism chamfering equipment. The grinding machine comprises a grinding disc and a grinding disc driving device, wherein the grinding disc comprises a grinding disc horizontally arranged and a main machine body used for driving the grinding disc to rotate; the grinding disc grinding machine also comprises a supporting table, wherein supporting legs with adjustable heights are arranged at the bottom of the supporting table, a working area which is communicated up and down is arranged in the middle of the supporting table, the supporting table is arranged at the top of the main machine body, and the grinding disc is positioned in the working area; and the left cross beam and the right cross beam are arranged in the working area on the supporting table in parallel, a left leaning body and a right leaning body are respectively arranged on opposite sides of the left cross beam and the right cross beam, and the leaning bodies on opposite sides of the left leaning body and the right leaning body are matched in a V-shaped included angle mode so as to be used for supporting the prism to be processed. The utility model discloses a set up height-adjustable's brace table to the volume of putting down of edge when changing the prism edging, and then change the edging grinding volume, can be applicable to the processing of different prisms, different specification edging, and easy operation, it is efficient.

Exist among the above-mentioned technical scheme, need make a round trip to change the difference when carrying out the chamfer of different angles to the prism and control the body, use very inconvenient, need artifical manual fixing when adding man-hour to the prism simultaneously, and then increased workman's the amount of labour.

Therefore, it is necessary to provide an automatic chamfering machine for processing a splitting prism to solve the above-mentioned technical problems.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides an automatic beveler of beam splitting prism processing usefulness, the utility model discloses a realize through following technical scheme.

An automatic chamfering machine for processing a beam splitter prism comprises a base, a front sliding mechanism, a rear sliding mechanism, a rotating mechanism, a fixing mechanism, a left sliding mechanism and a right sliding mechanism, wherein the front side and the rear side of the upper surface of the base are symmetrically and fixedly connected with vertical plates, the front sliding mechanism and the rear sliding mechanism are arranged between the vertical plates and are used for moving the beam splitter prism back and forth, the rotating mechanism is arranged at the top of the front sliding mechanism and the rear sliding mechanism, the rotating mechanism can enable the other side of the beam splitter prism to rotate to a processing position, the fixing mechanism is arranged at the top of the rotating mechanism and is symmetrically and leftwards arranged, the fixing mechanism clamps and fixes the beam splitter prism, the left side and the right side of the upper surface of the base are symmetrically and fixedly connected with supporting plates, the left sliding mechanism and the right sliding mechanism are arranged between the tops of the supporting plates, a lifting cylinder is fixedly arranged below the left sliding mechanism and the right sliding mechanism, and the chamfering mechanism are fixedly connected with the left sliding mechanism through the lifting cylinder, the distance between the chamfering mechanism and the light splitting prism can be adjusted by the left-right sliding mechanism and the lifting cylinder.

Preferably, front and back slide mechanism includes first sliding block, first drive screw and first driving motor, the rigid coupling has first track pole between the riser, and first track pole bilateral symmetry sets up, the first track pole sliding connection of the side about both ends and the corresponding of the left and right sides of first sliding block, first drive screw rotates to be connected between the riser that corresponds, set up the screw hole with first drive screw threaded connection on the first sliding block, first driving motor fixed mounting is on the preceding lateral wall of front side riser, first driving motor's output shaft head run through the riser and with first drive screw's front end fixed connection.

Preferably, rotary mechanism includes fixed disk, rolling disc and rotation motor, the top four corners department rigid coupling of first sliding block has four bracing pieces, the bottom of fixed disk and the equal fixed connection of head of each bracing piece, the rolling disc sets up directly over the fixed disk and sets up with the axle center, and the bottom center department rigid coupling of rolling disc has the connecting seat, rotation motor fixed mounting is in the bottom center department of fixed disk, the output shaft head that rotates the motor run through the top of fixed disk and with the bottom fixed connection of connecting seat.

Preferably, a plurality of support columns are uniformly and fixedly connected to the circumference of the top of the fixed disc, the top of each support column is rotatably connected with a roller, and an annular groove corresponding to each roller in sliding connection is formed in the bottom of the rotating disc.

Preferably, fixing mechanism includes fixing base and fixed cylinder, fixing base fixed connection is at the top of fixed disk to bilateral symmetry sets up, fixed cylinder fixed mounting is on the one side outer wall that the fixed seat was kept away from mutually, the piston rod head of fixed cylinder runs through fixing base and rigid coupling and has splint, the relative one side rigid coupling of splint has the slipmat.

Preferably, the side-to-side sliding mechanism includes second sliding block, second drive screw and second driving motor, the rigid coupling has second track pole between the backup pad, and second track pole longitudinal symmetry sets up, both ends and the front and back side second track pole sliding connection that corresponds around the second sliding block, second drive screw rotates to be connected between the backup pad that corresponds, the top rigid coupling of second sliding block has the drive block with second drive screw threaded connection, second driving motor fixed mounting is on the lateral wall of right side backup pad, second driving motor's output shaft head run through the backup pad and with second drive screw's right-hand member fixed connection.

Preferably, chamfering mechanism includes mounting panel, grinding motor and angle accommodate motor, the top of mounting panel and the piston rod head fixed connection of lift cylinder, bilateral symmetry rigid coupling has the connecting plate around the bottom of mounting panel, grinding motor rotates through the pivot of bilateral symmetry rigid coupling around and connects between the connecting plate that corresponds, grinding motor's output shaft head rigid coupling has the emery wheel, angle accommodate motor fixed mounting is on the lateral wall of front side connecting plate, angle accommodate motor's output shaft head run through the connecting plate and with the front side end fixed connection of front side pivot.

Preferably, the upper surface of mounting panel is preceding the back symmetry rigid coupling to have the slide bar, the top of slide bar runs through the top to the second sliding block, each slide bar and the second sliding block sliding connection that corresponds.

The utility model has the advantages that:

(1) the front-back sliding mechanism is convenient for the front-back movement of the beam splitter prism, so that the beam splitter prism moves back and forth on the grinding wheel, and the chamfering and polishing work of the edge of the beam splitter prism is finished.

(2) The angle of the grinding wheel arranged on the grinding motor can be adjusted through the arranged angle adjusting motor, so that the edges with different angles on the beam splitter prism can be chamfered and ground, other auxiliary parts do not need to be replaced, and chamfering efficiency is improved.

(3) Through the rotary mechanism and the fixing mechanism which are arranged, the next edge can be quickly rotated to a processing position after the edge chamfering on the same horizontal plane of the beam splitter prism is finished, and the chamfering polishing operation on the next edge is carried out, so that the chamfering polishing efficiency is improved, the fixing mechanism can have better stability when the beam splitter prism is polished, and the polishing precision is prevented from being reduced due to the movement of the beam splitter prism.

(4) The distance between the beam splitter prism and the grinding wheel on the fixing mechanism can be adjusted through the left-right sliding mechanism and the lifting cylinder, so that the chamfer is better polished, and the polished chamfer angle meets the use requirement.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some examples of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

FIG. 1: the utility model discloses a structure sketch map of an automatic chamfering machine for processing a beam splitter prism;

FIG. 2: the utility model discloses a front view of an automatic chamfering machine for processing a beam splitter prism;

FIG. 3: the utility model discloses a left side cross-sectional view of an automatic chamfering machine for processing a beam splitter prism;

FIG. 4: the utility model discloses the bottom structure schematic diagram of rolling disc.

The reference numbers are as follows:

1. a base; 11. a vertical plate; 12. a support plate;

2. a front-rear sliding mechanism; 21. a first slider; 22. a first drive screw; 23. a first drive motor; 24. a first track bar;

3. a rotation mechanism; 31. fixing the disc; 32. rotating the disc; 33. rotating the motor; 34. a support bar; 35. a connecting seat; 36. a support column; 37. a roller; 38. an annular groove;

4. a fixing mechanism; 41. a fixed seat; 42. fixing the air cylinder; 43. a splint; 44. a non-slip mat;

5. a left-right sliding mechanism; 51. a second slider; 52. a second drive screw; 53. a second drive motor; 54. a second track bar; 55. a drive block;

6. a chamfering mechanism; 61. mounting a plate; 62. polishing the motor; 63. an angle adjustment motor; 64. a connecting plate; 65. a rotating shaft; 66. a grinding wheel; 67. a slide bar;

7. and a lifting cylinder.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1-4, the present invention provides the following embodiments:

example one

An automatic chamfering machine for processing a beam splitter prism comprises a base 1, a front and back sliding mechanism 2, a rotating mechanism 3, a fixing mechanism 4, a left and right sliding mechanism 5 and a chamfering mechanism 6, wherein the front and back sides of the upper surface of the base 1 are symmetrically and fixedly connected with vertical plates 11, the front and back sliding mechanism 2 is arranged between the vertical plates 11, the front and back sliding mechanism 2 is used for the front and back movement of the beam splitter prism, the rotating mechanism 3 is arranged at the top of the front and back sliding mechanism 2, the rotating mechanism 3 can enable the other side of the beam splitter prism to rotate to a processing position, the fixing mechanism 4 is arranged at the top of the rotating mechanism 3 and is symmetrically arranged left and right, the fixing mechanism 4 clamps and fixes the beam splitter prism, the left and right sides of the upper surface of the base 1 are symmetrically and fixedly connected with supporting plates 12, the left and right sliding mechanism 5 is arranged between the tops of the supporting plates 12, and a lifting cylinder 7 is fixedly arranged below the left and right sliding mechanism 5, the chamfering mechanism 6 is fixedly connected with the left-right sliding mechanism 5 through the lifting cylinder 7, and the distance between the chamfering mechanism 6 and the beam splitting prism can be adjusted by the left-right sliding mechanism 5 and the lifting cylinder 7.

Further, the front-back sliding mechanism 2 comprises a first sliding block 21, a first driving screw 22 and a first driving motor 23, a first track rod 24 is fixedly connected between the vertical plates 11, the first track rods 24 are arranged in bilateral symmetry, the left and right ends of the first sliding block 21 are connected with the corresponding left and right first track rods 24 in a sliding manner, the first driving screw 22 is connected between the corresponding vertical plates 11 in a rotating manner, the first sliding block 21 is provided with a threaded hole in threaded connection with the first driving screw 22, the first driving motor 23 is fixedly arranged on the front side wall of the front vertical plate 11, the head part of an output shaft of the first driving motor 23 penetrates through the vertical plate 11 and is fixedly connected with the front end of the first driving screw 22, and the front and back movement of the beam splitter prism is realized through the arranged front and back sliding mechanism 2, therefore, the beam splitter prism moves back and forth on the chamfering mechanism 6, and chamfering and polishing work of the edge of the beam splitter prism is further completed.

Further, fixed establishment 4 includes fixing base 41 and fixed cylinder 42, fixing base 41 fixed connection is at the top of fixed disk 31, and bilateral symmetry sets up, fixed cylinder 42 fixed mounting is on the one side outer wall that fixing base 41 kept away from mutually, the piston rod head of fixed cylinder 42 runs through fixing base 41 and the rigid coupling has splint 43, splint 43's relative one side rigid coupling has slipmat 44, fixed establishment 4 can have better stability when beam splitting prism polishes, thereby avoid reducing the precision of polishing because of beam splitting prism's removal, the slipmat 44 of setting can prevent splint 43 to beam splitting prism's scratch, also can increase the frictional force to beam splitting prism simultaneously, and then increase fixed effect.

Further, the left-right sliding mechanism 5 comprises a second sliding block 51, a second driving screw 52 and a second driving motor 53, wherein second track rods 54 are fixedly connected between the support plates 12, the second track rods 54 are symmetrically arranged in front and back, the front end and the back end of the second sliding block 51 are slidably connected with the corresponding front-side and back-side second track rods 54, the second driving screw 52 is rotatably connected between the corresponding support plates 12, a driving block 55 in threaded connection with the second driving screw 52 is fixedly connected to the top of the second sliding block 51, the second driving motor 53 is fixedly arranged on the outer side wall of the right support plate 12, the head of an output shaft of the second driving motor 53 penetrates through the support plates 12 and is fixedly connected with the right end of the second driving screw 52, the distance between the light splitting prism on the fixing mechanism 4 and the chamfering mechanism 6 can be adjusted through the arranged left-right sliding mechanism 5, so as to polish the chamfer better, meanwhile, the polished chamfer angle meets the use requirement.

Further, the chamfering mechanism 6 comprises a mounting plate 61, a grinding motor 62 and an angle adjusting motor 63, the top of the mounting plate 61 is fixedly connected with the head of the piston rod of the lifting cylinder 7, the front side and the back side of the bottom of the mounting plate 61 are symmetrically and fixedly connected with connecting plates 64, the grinding motor 62 is rotatably connected between the corresponding connecting plates 64 through rotating shafts 65 which are symmetrically and fixedly connected with the front side and the back side, the head of an output shaft of the grinding motor 62 is fixedly connected with a grinding wheel 66, the angle adjusting motor 63 is fixedly mounted on the outer side wall of the front side connecting plate 64, the head of the output shaft of the angle adjusting motor 63 penetrates through the connecting plates 64 and is fixedly connected with the front side end of the front side rotating shaft 65, the angle of the grinding wheel 66 arranged on the grinding motor 62 can be adjusted by the arranged angle adjusting motor 63, thereby can carry out the chamfer to the edge of different angles on the beam splitting prism and polish, need not to change other auxiliary members to the efficiency of chamfer has been accelerated.

Furthermore, slide bars 67 are symmetrically and fixedly connected to the front and the back of the upper surface of the mounting plate 61, the tops of the slide bars 67 penetrate through the upper side of the second slide block 51, each slide bar 67 is slidably connected with the corresponding second slide block 51, and the chamfering mechanism 6 has better stability when chamfering the beam splitter prism through the arrangement of the slide bars 67.

The specific implementation manner of this embodiment is:

when the chamfer angle of the beam splitter prism is processed, the beam splitter prism is placed on the rotating disc 32 on the rotating mechanism 3, the fixed cylinder 42 is started, the piston rod of the fixed cylinder 42 extends out, so that the anti-skid pad 44 on the clamping plate 43 is contacted with the beam splitter prism, and then the clamping and fixing are carried out, the second driving motor 53 is started to rotate, the second driving motor 53 drives the second driving screw 52 to rotate, so that the driving block 55 in threaded connection with the second driving screw drives the second sliding block 51 to slide left and right on the second track rod 54, the piston rod of the lifting cylinder 7 is started to extend out, under the matching of the left and right sliding mechanism 5 and the lifting cylinder 7, the grinding wheel 66 on the grinding motor 62 is contacted with the edge to be processed on the beam splitter prism, the angle adjusting motor 63 is started, so that the grinding wheel 66 on the grinding motor 62 is adjusted to the required chamfer angle, the grinding motor 62 is started to rotate, thereby drive emery wheel 66 and rotate, start first driving motor 23, first driving motor 23 drives first drive screw 22 and rotates to drive threaded connection's first sliding block 21 and slide back and forth on first track pole 24, and then accomplish an edge chamfer processing on the beam splitter prism.

Example two

The difference from the first embodiment is that the following contents are also included:

the rotating mechanism 3 comprises a fixed disc 31, a rotating disc 32 and a rotating motor 33, four supporting rods 34 are fixedly connected to four corners of the top of the first sliding block 21, the bottom of the fixed disc 31 is fixedly connected with the heads of the supporting rods 34, the rotating disc 32 is arranged right above the fixed disc 31 and coaxially arranged, a connecting seat 35 is fixedly connected to the center of the bottom of the rotating disc 32, the rotating motor 33 is fixedly installed at the center of the bottom of the fixed disc 31, and the head of an output shaft of the rotating motor 33 penetrates through the top of the fixed disc 31 and is fixedly connected with the bottom of the connecting seat 35.

Further, the even rigid coupling of top circumference of fixed disk 31 has a plurality of support columns 36, and the top of each support column 36 all rotates and is connected with gyro wheel 37, and the bottom of rotating disk 32 is seted up and is corresponded each gyro wheel 37 sliding connection's ring channel 38, and the cooperation through support column 36, gyro wheel 37 and ring channel 38 can increase the stability of rotating disk 32, further prevented that rotating disk 32 atress slope leads to beam splitter prism's damage in the course of working.

In this embodiment:

after an edge chamfer on beam splitting prism coplanar is accomplished, start rotation motor 33, rotate motor 33 and drive rolling disc 32 and rotate to can rotate the processing position with the next edge of beam splitting prism, thereby the quick chamfer on next limit of carrying on operation of polishing, thereby improve chamfer efficiency of polishing.

The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments are not exhaustive and do not limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims (8)

1. The utility model provides an automatic beveler of beam splitting prism processing usefulness which characterized in that: comprises a base (1), a front sliding mechanism (2), a rear sliding mechanism (2), a rotating mechanism (3), a fixing mechanism (4), a left sliding mechanism (5) and a right sliding mechanism (6), wherein vertical plates (11) are symmetrically and fixedly connected with the front side and the rear side of the upper surface of the base (1), the front sliding mechanism (2) and the rear sliding mechanism (2) are arranged between the vertical plates (11), the front sliding mechanism (2) and the rear sliding mechanism (2) are used for moving a beam splitter prism back and forth, the rotating mechanism (3) is arranged at the top of the front sliding mechanism (2) and the rear sliding mechanism (3) can enable the other side of the beam splitter prism to rotate to a processing position, the fixing mechanism (4) is arranged at the top of the rotating mechanism (3) and is arranged in a left and right symmetrical mode, the fixing mechanism (4) clamps and fixes the beam splitter prism, supporting plates (12) are symmetrically and fixedly connected with the left side and right side of the upper surface of the base (1), the left sliding mechanism (5) is arranged between the tops of the supporting plates (12), the lower part fixed mounting of horizontal slide mechanism (5) has lift cylinder (7), chamfering mechanism (6) are through lift cylinder (7) and horizontal slide mechanism (5) fixed connection, horizontal slide mechanism (5) with the distance between adjustable chamfering mechanism (6) of lift cylinder (7) and the beam splitting prism.

2. The automatic chamfering machine for processing a splitting prism according to claim 1, wherein: front and back slide mechanism (2) include first sliding block (21), first drive screw (22) and first driving motor (23), the rigid coupling has first track pole (24) between riser (11), and first track pole (24) bilateral symmetry sets up, both ends and the first track pole (24) sliding connection of the side of controlling of corresponding about first sliding block (21), first drive screw (22) rotate to be connected between corresponding riser (11), set up the screw hole with first drive screw (22) threaded connection on first sliding block (21), first driving motor (23) fixed mounting is on the preceding lateral wall of front side riser (11), the output shaft head of first driving motor (23) run through riser (11) and with the front end fixed connection of first drive screw (22).

3. The automatic chamfering machine for processing the splitting prism according to claim 2, wherein: rotary mechanism (3) are including fixed disk (31), rolling disc (32) and rotation motor (33), the top four corners department rigid coupling of first sliding block (21) has four bracing pieces (34), the equal fixed connection of head of bottom and each bracing piece (34) of fixed disk (31), rolling disc (32) set up directly over fixed disk (31) and with the axle center setting, and the bottom center department rigid coupling of rolling disc (32) has connecting seat (35), rotation motor (33) fixed mounting is located at the bottom center of fixed disk (31), the output shaft head of rotation motor (33) run through the top of fixed disk (31) and with the bottom fixed connection of connecting seat (35).

4. The automatic chamfering machine for processing a splitting prism according to claim 3, wherein: the top circumference of fixed disk (31) is even rigid coupling has a plurality of support columns (36), and the top of each support column (36) all rotates and is connected with gyro wheel (37), ring channel (38) that correspond each gyro wheel (37) sliding connection are seted up to the bottom of rolling disc (32).

5. The automatic chamfering machine for processing a splitting prism according to claim 4, wherein: fixed establishment (4) include fixing base (41) and fixed cylinder (42), fixing base (41) fixed connection is at the top of fixed disk (31) to bilateral symmetry sets up, fixed cylinder (42) fixed mounting is on one side outer wall that fixing base (41) kept away from mutually, the piston rod head of fixed cylinder (42) runs through fixing base (41) and rigid coupling has splint (43), the relative one side rigid coupling of splint (43) has slipmat (44).

6. The automatic chamfering machine for processing a splitting prism according to claim 1, wherein: the utility model discloses a drive mechanism, including left and right slide mechanism (5), left and right slide mechanism (5) includes second sliding block (51), second drive screw (52) and second driving motor (53), the rigid coupling has second track pole (54) between backup pad (12), and second track pole (54) longitudinal symmetry sets up, both ends and the front and back side second track pole (54) sliding connection that corresponds around second sliding block (51), second drive screw (52) rotate to be connected between corresponding backup pad (12), the top rigid coupling of second sliding block (51) has drive block (55) with second drive screw (52) threaded connection, second driving motor (53) fixed mounting is on the lateral wall of right side backup pad (12), and the output shaft head of second driving motor (53) runs through backup pad (12) and with the right-hand member fixed connection of second drive screw (52).

7. The automatic chamfering machine for processing a splitting prism according to claim 1, wherein: chamfering mechanism (6) are including mounting panel (61), grinding motor (62) and angle accommodate motor (63), the top of mounting panel (61) and the piston rod head fixed connection of lift cylinder (7), bilateral symmetry rigid coupling has connecting plate (64) around the bottom of mounting panel (61), grinding motor (62) rotate through pivot (65) of bilateral symmetry rigid coupling around and connect between corresponding connecting plate (64), grinding motor (62)'s output shaft head rigid coupling has emery wheel (66), angle accommodate motor (63) fixed mounting is on the lateral wall of front side connecting plate (64), the output shaft head of angle accommodate motor (63) run through connecting plate (64) and with the front side pivot (65) the preceding side fixed connection.

8. The automatic chamfering machine for processing a splitting prism according to claim 7, wherein: the symmetry rigid coupling has slide bar (67) around the upper surface of mounting panel (61), the top of slide bar (67) runs through the top to second sliding block (51), each slide bar (67) and corresponding second sliding block (51) sliding connection.

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