Precision machining center of connecting ring for chain

Abstract

The invention relates to the technical field of machining centers, and discloses a precision machining center of a connecting ring for a chain, which solves the problem that the table top of the machining center is disordered due to the fact that drilling chips on the table top cannot be cleaned and collected simultaneously after the connecting ring is drilled by the existing precision machining center of the connecting ring for the chain. A movable door is hinged to the front portion of the workbench, a mounting frame is fixedly mounted on the rear side of the top of the workbench, a hydraulic cylinder is fixedly mounted on the top of the mounting frame, the transmission end of the hydraulic cylinder extends into the mounting frame and is fixedly provided with a mounting strip, and a drilling machine is fixedly mounted in the middle of the bottom of the mounting strip. Sliding sleeves are fixedly mounted at the two ends of the middle of the mounting strip correspondingly, and sliding rods are inserted into the two sliding sleeves correspondingly. According to the precision machining center of the connecting ring for the chain, after drilling of the connecting ring is completed, drilling chippings on the table top can be cleaned and collected at the same time, the table top of the machining center is prevented from being disordered, and next use is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of machining centers, in particular to a precision machining center for a connecting ring for a chain. Background Art

[0002] The precision machining center for chain connecting rings is a high-precision facility or workshop dedicated to machining chain connecting rings; this precision machining center is usually equipped with advanced machining equipment and processes to ensure the machining accuracy and quality of the connecting rings; the precision machining center uses high-precision machine tools and processes to ensure that the size, shape and position accuracy of the connecting rings meet the design requirements; this is crucial to the overall performance and stability of the chain, because the accuracy of the connecting rings directly affects the transmission efficiency and life of the chain; in the precision machining center, the connecting rings will undergo a strict processing, testing and quality control process; this includes not only the detection of size and shape, but also material properties, surface Through these processes, it can be ensured that the connecting ring has excellent properties such as high strength, high wear resistance and high corrosion resistance; precision machining centers are usually equipped with advanced production management systems, which can optimize and manage the production process; this includes management of production planning, raw material procurement, processing schedule, quality control, etc.; by optimizing the production process, production efficiency can be improved, production costs can be reduced, thereby enhancing the competitiveness of the enterprise; after the precision machining center of the existing chain connecting ring completes the drilling of the connecting ring, the drilling debris on the table cannot be cleaned and collected at the same time, which causes the table of the machining center to be messy, affecting the next use. Summary of the invention

[0003] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a precision machining center for connecting rings for chains, which effectively solves the problem that after the existing precision machining center for connecting rings for chains in the above background technology completes the drilling of the connecting rings, it cannot clean and collect the drilling debris on the table at the same time, thereby causing the table of the machining center to be cluttered.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a precision machining center for a connecting ring for a chain, comprising a workbench, a movable door is hinged on the front part of the workbench, a mounting frame is fixedly installed on the rear side of the top of the workbench, a hydraulic cylinder is fixedly installed on the top of the mounting frame, a transmission end of the hydraulic cylinder extends to the interior of the mounting frame and a mounting strip is fixedly installed, a drilling machine is fixedly installed on the middle part of the bottom of the mounting strip, sliding sleeves are fixedly installed on both ends of the middle part of the mounting strip, sliding rods are inserted in the interior of the two sliding sleeves, and the tops of the two sliding rods are fixedly connected to the inner top of the mounting frame, and two blanking plates are symmetrically installed on the upper part of the interior of the workbench through two rotation axes. A collecting frame is provided at the inner bottom of the workbench, and pusher plates are provided on the upper parts of the two blanking plates. A transmission assembly is provided at the lower part of the mounting strip, and the transmission assembly is transmission-connected to the two blanking plates. When the hydraulic cylinder is running, power is output to the mounting bar, so that the mounting bar drives the two blanking plates to rotate downward through the transmission assembly and moves the two pusher plates.

[0005] Preferably, the transmission assembly includes two connecting rods, the two connecting rods are fixedly mounted at the two ends of the lower side of the mounting bar, racks are fixedly mounted at the bottom of the two connecting rods, the two racks are plugged into the two sides inside the workbench, vertical sliders are fixedly mounted on the sides of the two racks away from each other, vertical slide grooves are provided on the inner walls on both sides of the workbench, and the two vertical sliders are slidably mounted inside the two vertical slide grooves.

[0006] Preferably, the front sides of the racks are meshed with lower gears, the sides of the two lower gears that are away from each other are rotatably connected to the inner walls of both sides of the workbench through positioning shaft seats, the sides of the two lower gears that are close to each other are fixedly installed with rotating shafts, bearings are rotatably installed on the surfaces of the two rotating shafts, the bottoms of the two bearings are fixedly connected to the inner bottom of the workbench through fixing rods, and the ends of the two rotating shafts that are close to each other are fixedly installed with active bevel gears.

[0007] Preferably, the lower part of the active bevel gear surface is meshedly connected with a driven bevel gear, the bottom of the driven bevel gear is rotatably connected to the inner bottom of the workbench through a rotating shaft seat, and the tops of the two driven bevel gears are fixedly mounted with a turntable through a rotating rod.

[0008] Preferably, a transmission pin is rotatably mounted on one side of the upper portion of the turntable, a moving bar is sleeved on the surface of the two transmission pins, and a transmission bar is rotatably mounted on the middle portion of the top of the two moving bars.

[0009] Preferably, both ends of the two moving bars are fixedly installed with limit blocks, the front and rear inner walls of the workbench are respectively provided with two limit grooves, and the four limit blocks are respectively slidably installed inside the four limit grooves.

[0010] Preferably, the tops of the two transmission bars are rotatably connected to the bottoms of the two blanking plates respectively, and the middle parts of the two blanking plates away from each other are fixedly installed with shaft sleeves, and shaft rods are rotatably installed inside the two shaft sleeves, and threaded rods are fixedly installed at the ends of the two shaft rods close to each other, and the ends of the two threaded rods close to each other are rotatably connected to the inner walls of the two blanking plates respectively, and threaded sleeves are threadedly connected to the surfaces of the two threaded rods, and L-shaped rods are fixedly installed on both sides of the two threaded sleeves, and the upper ends of the two adjacent L-shaped rods are respectively fixedly connected to the two pushing plates.

[0011] Preferably, the ends of the two shafts that are away from each other are fixedly installed with upper gears, one side of the two upper gears is meshingly connected with a semicircular gear ring, the bottom of the two semicircular gear rings are fixedly installed with fixed seats, and both ends of the two fixed seats are fixedly connected to the inside of the workbench.

[0012] Preferably, a transverse slide block is fixedly installed at the bottom of the threaded sleeve, and a transverse slide groove is opened at the inner bottom of the two blanking plates, and the two transverse slide blocks are slidably installed inside the two transverse slide grooves respectively.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] (1) During operation, after drilling a hole in the connecting ring, the operator starts the hydraulic cylinder to drive the mounting bar upward, which drives the drilling machine upward and resets. When the mounting bar moves, it drives the two sliding sleeves to slide along the surfaces of the two sliding rods, thereby increasing the stability of the mounting bar when it moves. When the mounting bar moves upward, it drives the two racks upward through the two connecting rods. When the two racks move, they drive the vertical sliders to slide inside the vertical sliding grooves, thereby increasing the stability of the two racks when they move. When the two racks move upward, they drive the two lower gears to rotate along the two positioning shaft seats. When the two lower gears rotate, they drive the two rotating shafts to rotate inside the two bearings.

[0015] When the two rotating shafts rotate, the two driven bevel gears are driven to rotate along the two rotating shaft seats through the two active bevel gears. When the two driven bevel gears rotate, the turntable is driven to rotate through the rotating rod. When the turntable rotates, the two moving bars are driven to move back and forth through the transmission pin. When the two moving bars move, the limit blocks are driven to slide inside the limit grooves, thereby increasing the stability of the two moving bars when they move. When the two moving bars move back and forth, the two unloading plates are pulled by the transmission bars to rotate downward along the two rotating shafts, thereby causing the debris on the two unloading plates to fall.

[0016] (2) When the two feeder plates rotate downward, they both drive the upper gear to rotate along the semicircular gear ring. When the two upper gears rotate, they both drive the shaft rod to rotate inside the shaft sleeve. When the shaft rod rotates, it drives the two threaded sleeves to move toward each other through the threaded rod. Since the thread pitch of the two threaded rods is large, the two threaded sleeves move very quickly. When the two threaded sleeves move, they both drive the horizontal slider to slide inside the horizontal slide groove, which increases the stability of the two threaded sleeves when they move. When the two threaded sleeves move toward each other, they both drive the push plate through the L-shaped rod to scrape off the debris stuck on the two feeder plates, so that the metal debris can quickly and effectively fall to the inside of the collection frame for collection;

[0017] (3) After the precision machining center of the chain connecting ring completes the drilling of the connecting ring, the drilling debris on the table can be cleaned and collected at the same time, so as to avoid the table of the machining center from being cluttered and ensure the next use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0019] In the attached picture:

[0020] Figure 1 It is a front structural schematic diagram of a precision machining center for a connecting ring for a chain of the present invention;

[0021] Figure 2 It is a schematic diagram of the internal structure of the workbench of the present invention;

[0022] Figure 3 It is a front sectional structural schematic diagram of a precision machining center for a connecting ring for a chain of the present invention;

[0023] Figure 4 For the present invention Figure 2 The enlarged structural diagram of the middle workbench;

[0024] Figure 5 For the present invention Figure 3 The enlarged structural diagram of the middle workbench;

[0025] Figure 6 For the present invention Figure 5 The enlarged structural diagram at A in the middle;

[0026] Figure 7 For the present invention Figure 5 The enlarged structural diagram at B in the middle;

[0027] In the figure: 1, workbench; 2, movable door; 3, mounting frame; 4, mounting bar; 5, drilling machine; 6, hydraulic cylinder; 7, sliding sleeve; 8, sliding rod; 9, unloading plate; 10, pushing plate; 11, collecting frame; 12, connecting rod; 13, rack; 14, vertical slide block; 15, vertical slide groove; 16, lower gear; 17, positioning shaft seat; 18, rotating shaft; 19, bearing; 20, fixing rod; 21, driving bevel gear; 2 2. Driven bevel gear; 23. Rotating shaft seat; 24. Rotating rod; 25. Turntable; 26. Transmission pin; 27. Moving bar; 28. Limit block; 29. ​​Limit groove; 30. Transmission bar; 31. Bushing; 32. Shaft; 33. Threaded rod; 34. Threaded sleeve; 35. Horizontal slider; 36. Horizontal slide groove; 37. L-shaped rod; 38. Upper gear; 39. Semicircular gear ring; 40. Fixed seat; 41. Rotating shaft. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] Embodiment 1, by Figures 1 to 7 The present invention comprises a workbench 1, a movable door 2 is hingedly connected to the front of the workbench 1, a mounting frame 3 is fixedly installed on the rear side of the top of the workbench 1, a hydraulic cylinder 6 is fixedly installed on the top of the mounting frame 3, a transmission end of the hydraulic cylinder 6 extends to the inside of the mounting frame 3 and a mounting bar 4 is fixedly installed, a drilling machine 5 is fixedly installed in the middle of the bottom of the mounting bar 4, sliding sleeves 7 are fixedly installed at both ends of the middle of the mounting bar 4, sliding rods 8 are inserted in the inside of the two sliding sleeves 7, and the tops of the two sliding rods 8 are fixedly connected to the inner top of the mounting frame 3, and two blanking plates 9 are symmetrically rotated and installed on the upper part of the interior of the workbench 1 through two rotating shafts 41, a collecting frame 11 is provided at the inner bottom of the workbench 1, and push plates 10 are provided on the upper parts of the two blanking plates 9, and a transmission assembly is provided at the lower part of the mounting bar 4, which is transmission-connected to the two blanking plates 9, and the hydraulic cylinder 6 outputs power to the mounting bar 4 when it is running, so that the mounting bar 4 drives the two blanking plates 9 to rotate downward through the transmission assembly and moves the two push plates 10.

[0030] During operation, after drilling a hole in the connecting ring, the operator starts the hydraulic cylinder 6 to drive the mounting bar 4 to move upward, and the mounting bar 4 drives the drilling machine 5 to move upward and reset when moving upward. When the mounting bar 4 moves, it drives the two sliding sleeves 7 to slide along the surfaces of the two sliding rods 8, thereby increasing the stability of the mounting bar 4 when moving upward. When the mounting bar 4 moves upward, it drives the transmission assembly to operate through the two connecting rods 12. When the transmission assembly operates, it pulls the two blanking plates 9 to rotate downward along the two rotating shafts 41, so that the debris on the two blanking plates 9 falls off;

[0031] When the transmission component is running, it will also drive the push plate 10 to scrape off the debris stuck on the two unloading plates 9, so that the metal debris can quickly and effectively fall into the collection frame 11 for collection; after the precision machining center of the chain connecting ring completes the drilling of the connecting ring, the drilling debris on the table can be cleaned and collected at the same time, avoiding clutter on the table of the machining center and ensuring the next use.

[0032] Embodiment 2, on the basis of embodiment 1, the transmission assembly includes two connecting rods 12, the two connecting rods 12 are fixedly mounted at the two ends of the lower side of the mounting bar 4, the bottoms of the two connecting rods 12 are fixedly mounted with racks 13, the two racks 13 are plugged into the two sides of the inside of the workbench 1, the sides of the two racks 13 away from each other are fixedly mounted with vertical sliders 14, the inner walls of both sides of the workbench 1 are provided with vertical slide grooves 15, the two vertical sliders 14 are slidably mounted inside the two vertical slide grooves 15; the front sides of the racks 13 are meshedly connected with lower gears 16, the sides of the two lower gears 16 away from each other are rotatably connected to the inner walls of both sides of the workbench 1 through positioning shaft seats 17, the sides of the two lower gears 16 close to each other are fixedly mounted with rotating shafts 18, the surfaces of the two rotating shafts 18 are rotatably mounted with bearings 19, and the bottoms of the two bearings 19 are rotated by The fixed rod 20 is fixedly connected to the inner bottom of the workbench 1, and the ends of the two rotating shafts 18 close to each other are fixedly installed with a driving bevel gear 21; the lower part of the surface of the driving bevel gear 21 is meshed and connected with a driven bevel gear 22, and the bottom of the driven bevel gear 22 is rotatably connected to the inner bottom of the workbench 1 through a rotating shaft seat 23, and the top of the two driven bevel gears 22 is fixedly installed with a turntable 25 through a rotating rod 24; a transmission pin 26 is rotatably installed on one side of the upper part of the turntable 25, and the surfaces of the two transmission pins 26 are sleeved with moving bars 27, and the middle part of the top of the two moving bars 27 is rotatably installed with a transmission bar 30; both ends of the two moving bars 27 are fixedly installed with limit blocks 28, and the inner walls on the front and rear sides of the workbench 1 are respectively provided with two limit grooves 29, and the four limit blocks 28 are respectively slidably installed in the inside of the four limit grooves 29.

[0033] When the mounting bar 4 moves upward, the two racks 13 are driven to move upward through the two connecting rods 12. When the two racks 13 move, they drive the vertical slider 14 to slide inside the vertical slide groove 15, which increases the stability of the two racks 13 when they move. When the two racks 13 move upward, they drive the two lower gears 16 to rotate along the two positioning shaft seats 17. When the two lower gears 16 rotate, they drive the two rotating shafts 18 to rotate inside the two bearings 19.

[0034] When the two rotating shafts 18 rotate, the two driven bevel gears 22 will be driven to rotate along the two rotating shaft seats 23 through the two active bevel gears 21. When the two driven bevel gears 22 rotate, they will drive the turntable 25 to rotate through the rotating rod 24. When the turntable 25 rotates, it will drive the two moving bars 27 to move back and forth through the transmission pin 26. When the two moving bars 27 move, they will drive the limit blocks 28 to slide inside the limit grooves 29, thereby increasing the stability of the two moving bars 27 when moving. When the two moving bars 27 move back and forth, they will pull the transmission bar 30 to move.

[0035] Embodiment 3, on the basis of embodiment 2, the tops of the two transmission bars 30 are rotatably connected to the bottoms of the two blanking plates 9, respectively, the middle parts of the two blanking plates 9 away from each other are fixedly installed with a shaft sleeve 31, the interiors of the two shaft sleeves 31 are rotatably installed with shaft rods 32, the ends of the two shaft rods 32 close to each other are fixedly installed with threaded rods 33, the ends of the two threaded rods 33 close to each other are rotatably connected to the inner walls of the two blanking plates 9, the surfaces of the two threaded rods 33 are threadedly connected with threaded sleeves 34, and both sides of the two threaded sleeves 34 are fixedly installed with L-shaped rods 37 The upper ends of the two adjacent L-shaped rods 37 are fixedly connected to the two push plates 10 respectively; the ends of the two shafts 32 that are away from each other are fixedly installed with upper gears 38, and one side of the two upper gears 38 is meshed with a semicircular gear ring 39, and the bottoms of the two semicircular gear rings 39 are fixedly installed with fixed seats 40, and the two ends of the two fixed seats 40 are fixedly connected to the inside of the workbench 1; the bottom of the threaded sleeve 34 is fixedly installed with a horizontal slide block 35, and the inner bottoms of the two blanking plates 9 are provided with horizontal slide grooves 36, and the two horizontal slide blocks 35 are slidably installed in the inside of the two horizontal slide grooves 36 respectively.

[0036] When the two transmission bars 30 are pulled, they will pull the two unloading plates 9 to rotate downward along the two rotating shafts 41, so that the debris on the two unloading plates 9 will fall down. When the two unloading plates 9 rotate downward, they will drive the upper gear 38 to rotate along the semicircular gear ring 39. When the two upper gears 38 rotate, they will drive the shaft rod 32 to rotate inside the shaft sleeve 31. When the shaft rod 32 rotates, it will drive the two threaded sleeves 34 to move toward each other through the threaded rod 33. Since the thread pitch of the two threaded rods 33 is large, the two threaded sleeves 34 move very quickly. When the two threaded sleeves 34 move, they will drive the cross slide block 35 to slide inside the cross slide groove 36, which increases the stability of the two threaded sleeves 34 when moving. When the two threaded sleeves 34 move toward each other, they will drive the push plate 10 through the L-shaped rod 37 to scrape off the debris stuck on the two unloading plates 9.

[0037] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A precision machining center for a chain connecting ring, comprising a workbench (1), characterized in that: A movable door (2) is hingedly connected to the front of the workbench (1); a mounting frame (3) is fixedly installed on the rear side of the top of the workbench (1); a hydraulic cylinder (6) is fixedly installed on the top of the mounting frame (3); a driving end of the hydraulic cylinder (6) extends into the interior of the mounting frame (3) and is fixedly installed with a mounting bar (4); a drilling machine (5) is fixedly installed in the middle of the bottom of the mounting bar (4); sliding sleeves (7) are fixedly installed at both ends of the middle of the mounting bar (4); sliding rods (8) are inserted into the interior of the two sliding sleeves (7); the tops of the two sliding rods (8) are connected to the mounting frame (3). The inner top is fixedly connected, and two blanking plates (9) are symmetrically rotated and installed on the upper part of the workbench (1) through two rotating shafts (41). The inner bottom of the workbench (1) is provided with a collecting frame (11), and the upper parts of the two blanking plates (9) are both provided with push plates (10). The lower part of the mounting bar (4) is provided with a transmission component, and the transmission component is transmission-connected with the two blanking plates (9). When the hydraulic cylinder (6) is in operation, it outputs power to the mounting bar (4), so that the mounting bar (4) drives the two blanking plates (9) to rotate downward through the transmission component and moves the two push plates (10).

2. A precision machining center for a chain connecting ring according to claim 1, characterized in that: The transmission assembly comprises two connecting rods (12), the two connecting rods (12) are fixedly mounted at the two ends of the lower side of the mounting bar (4), the bottoms of the two connecting rods (12) are fixedly mounted with racks (13), the two racks (13) are plugged into the two sides of the inside of the workbench (1), the two racks (13) are fixedly mounted with vertical slide blocks (14) on the sides away from each other, the inner walls of the two sides of the workbench (1) are provided with vertical slide grooves (15), and the two vertical slide blocks (14) are slidably mounted inside the two vertical slide grooves (15).

3. The precision machining center for a chain connecting ring according to claim 1, characterized in that: The front sides of the racks (13) are meshedly connected with lower gears (16); the sides of the two lower gears (16) that are away from each other are rotatably connected to the inner walls of the two sides of the workbench (1) through positioning shaft seats (17); the sides of the two lower gears (16) that are close to each other are fixedly installed with rotating shafts (18); the surfaces of the two rotating shafts (18) are rotatably installed with bearings (19); the bottoms of the two bearings (19) are fixedly connected to the inner bottom of the workbench (1) through fixing rods (20); and the ends of the two rotating shafts (18) that are close to each other are fixedly installed with active bevel gears (21).

4. A precision machining center for a chain connecting ring according to claim 3, characterized in that: The lower part of the surface of the active bevel gear (21) is meshedly connected with a driven bevel gear (22), the bottom of the driven bevel gear (22) is rotatably connected to the inner bottom of the workbench (1) through a rotating shaft seat (23), and the tops of the two driven bevel gears (22) are fixedly mounted with a rotating disk (25) through a rotating rod (24).

5. The precision machining center for a chain connecting ring according to claim 4, characterized in that: A transmission pin (26) is rotatably mounted on one side of the upper part of the rotating disk (25), a moving bar (27) is sleeved on the surface of the two transmission pins (26), and a transmission bar (30) is rotatably mounted in the middle of the top of the two moving bars (27).

6. A precision machining center for a chain connecting ring according to claim 5, characterized in that: Limit blocks (28) are fixedly installed at both ends of the two moving bars (27), and two limit slots (29) are respectively provided on the inner walls on both sides of the front and rear sides of the workbench (1), and the four limit blocks (28) are respectively slidably installed inside the four limit slots (29).

7. The precision machining center for a chain connecting ring according to claim 5, characterized in that: The tops of the two transmission bars (30) are rotatably connected to the bottoms of the two blanking plates (9), respectively; a shaft sleeve (31) is fixedly installed in the middle of the two blanking plates (9) on the side away from each other; a shaft rod (32) is rotatably installed inside the two shaft sleeves (31); a threaded rod (33) is fixedly installed at the ends of the two shaft rods (32) close to each other; the ends of the two threaded rods (33) close to each other are rotatably connected to the inner walls of the two blanking plates (9), the surfaces of the two threaded rods (33) are threadedly connected to threaded sleeves (34), and L-shaped rods (37) are fixedly installed on both sides of the two threaded sleeves (34); the upper ends of the two adjacent L-shaped rods (37) are fixedly connected to the two push plates (10), respectively.

8. The precision machining center for a chain connecting ring according to claim 7, characterized in that: An upper gear (38) is fixedly mounted on one end of the two shafts (32) that is away from each other, and a semicircular gear ring (39) is meshedly connected to one side of the two upper gears (38). A fixing seat (40) is fixedly mounted on the bottom of the two semicircular gear rings (39), and both ends of the two fixing seats (40) are fixedly connected to the inside of the workbench (1).

9. The precision machining center for a chain connecting ring according to claim 7, characterized in that: A horizontal slide block (35) is fixedly mounted on the bottom of the threaded sleeve (34), and a horizontal slide groove (36) is provided on the inner bottom of the two blanking plates (9). The two horizontal slide blocks (35) are respectively slidably mounted inside the two horizontal slide grooves (36).

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