CN118848689A - A casting machining device convenient for fixing castings - Google Patents

Abstract

The invention discloses a casting machining device convenient for fixing castings, and relates to the technical field of casting machining; the device comprises a processing table, wherein a workpiece table is arranged on the upper surface of the processing table, two fixing plates are fixedly arranged on the upper surface of the workpiece table, first hydraulic cylinders are arranged on opposite sides of the two fixing plates, jackets are fixedly arranged at piston ends of the two first hydraulic cylinders, a fixing frame is fixedly arranged on the upper surface of the processing table, and a second hydraulic cylinder is fixedly arranged at one end of the fixing frame; according to the invention, the tubular casting is clamped by the mutual approaching of the two jackets, and the tubular casting intermittently moves horizontally and intermittently rotates towards one side of the polishing machine by the cooperation of the feeding mechanism and the rotating mechanism, so that the surface of the tubular casting is comprehensively polished by the polishing wheel of the polishing machine, the automatic feeding in the polishing process of the tubular casting is conveniently realized, and the polishing convenience and the polishing efficiency of the tubular casting are effectively improved.

Description

A casting machining device convenient for fixing castings

Technical Field

The invention relates to the technical field of casting processing, in particular to a casting machining device which is convenient for fixing castings.

Background Art

Castings are metal objects obtained by various casting methods, that is, the smelted liquid metal is poured into a pre-prepared mold by pouring, injection, suction or other casting methods, and after cooling and subsequent processing such as grinding, the resulting object has a certain shape, size and performance;

Before finishing the casting, the casting needs to be rough machined. Machining generally includes cutting, turning, drilling, deburring and polishing. However, the casting machining equipment in the prior art still has some defects when polishing tubular castings:

1. Although the casting machining equipment in the prior art is equipped with various clamps to fix the tubular castings during machining, it is inconvenient to automatically push and flip the tubular castings during machining. If comprehensive polishing is required, the operator needs to manually adjust the position and angle of the tubular castings in a stopped state, which makes the polishing of the tubular castings inconvenient and the polishing efficiency of the tubular castings low.

2. At the same time, it is inconvenient to collect and process the particles and debris generated during the polishing process of the casting machining equipment in the prior art, which makes the cleaning of the workshop environment inconvenient and easy to be inhaled by the operators;

In view of the above problems, the inventor proposes a casting machining device that is convenient for fixing castings to solve the above problems.

Summary of the invention

In order to solve the above problems, the object of the present invention is to provide a casting machining device which is convenient for fixing the casting.

In order to solve the above technical problems, the present invention adopts the following technical solutions: a casting machining device which is convenient for fixing castings, comprising a machining table, a workpiece table is provided on the upper surface of the machining table, two fixed plates are fixedly installed on the upper surface of the workpiece table, first hydraulic cylinders are provided on opposite sides of the two fixed plates, and jackets are fixedly installed on the piston ends of the two first hydraulic cylinders, a fixed frame is fixedly installed on the upper surface of the machining table, a second hydraulic cylinder is fixedly installed on one end of the fixed frame, a grinder is fixedly installed on the piston end of the second hydraulic cylinder, a dust removal assembly is provided on the workpiece table, a feeding mechanism is provided between the machining table and the workpiece table, and a rotating mechanism is provided between the machining table and the two first hydraulic cylinders.

Preferably, the dust removal assembly includes two dust-proof plates, a conical collecting groove is opened on the upper surface of the workpiece table, one end of the two dust-proof plates is fixedly installed on the bottom wall of the conical collecting groove, and a number of evenly distributed dust exhaust branch pipes are fixedly installed on the side wall of the conical collecting groove, and a dust exhaust pipe is fixedly installed on one end of the number of dust exhaust branch pipes.

Preferably, the two dust-proof plates are arranged obliquely above the conical collecting trough.

Preferably, the feeding mechanism includes two first frame plates, the two first frame plates are fixedly mounted on the upper surface of the processing table, the two first frame plates are rotatably mounted with first rotating shafts, one end of the two first rotating shafts are fixedly mounted with transmission wheels, a transmission belt is installed between the two transmission wheels, one end of the transmission belt is fixedly mounted with a driving rod, and one end of the driving rod is fixedly connected to the lower surface of the workpiece table.

Preferably, a transmission gear is fixedly installed on the other end of one of the first rotating shafts, a first rotating rod is rotatably installed on the two first frame plates, a first synchronous wheel is fixedly installed on one end of the two first rotating rods, a first synchronous belt is installed for transmission between the two first synchronous wheels, and a plurality of evenly distributed teeth are fixedly installed on one end of the first synchronous belt.

Preferably, a servo motor is fixedly mounted on one side of the processing table, and a driving output end of the servo motor is fixedly connected to the other end of one of the first rotating rods.

Preferably, the rotating mechanism includes two second rotating shafts, one end of which is rotatably connected to a fixed plate, one end of which is fixedly connected to one end of a first hydraulic cylinder, two second frame plates are fixedly mounted on the upper surface of the workpiece table, a second rotating rod is rotatably mounted between the two second frame plates, second synchronous wheels are fixedly mounted on both ends of the second rotating rod and the other ends of the two second rotating shafts, and a second synchronous belt is transmission-installed between two adjacent second synchronous wheels.

Preferably, a first transmission rod is rotatably mounted on one end of the workpiece platform, and first bevel gears are fixedly mounted on one end of the first transmission rod and one end of the second rotation rod, and the two first bevel gears are meshed with each other.

Preferably, a second transmission rod is rotatably mounted on the lower surface of the workpiece table, and second bevel gears are fixedly mounted on the middle part of the second transmission rod and the other end of the first transmission rod, and the two second bevel gears are meshed with each other. A passive gear is fixedly mounted on one end of the second transmission rod, and a toothed plate is fixedly mounted on the upper surface of the processing table, and the toothed plate is meshedly connected with the passive gear.

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

1. In the present invention, the tubular casting is clamped by bringing two jackets close to each other, and the feeding mechanism and the rotating mechanism cooperate to make the tubular casting intermittently move horizontally and rotate intermittently toward one side of the polishing machine, and the grinding wheel of the polishing machine performs comprehensive polishing on the surface of the tubular casting, thereby conveniently realizing automatic feeding during the polishing process of the tubular casting, thereby effectively improving the convenience and efficiency of polishing of the tubular casting;

2. In the present invention, by connecting the pipe of the external dust suction device to the end of the dust exhaust pipe, the particles and debris generated by grinding and polishing fall on the inclined surface of the dustproof plate and fall into the conical collecting trough along the inclined surface. The dust suction device sucks the particles and debris in the conical collecting trough through the dust exhaust pipe and the dust exhaust branch pipe to avoid the particles and debris from splashing, thereby improving the convenience of cleaning the workshop environment and preventing the particles and debris from being inhaled by the operators.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

FIG. 1 is a schematic diagram of the overall structure of a casting machining device for fixing a casting according to the present invention.

FIG. 2 is another overall structural schematic diagram of a casting machining device for facilitating the fixing of castings according to the present invention.

FIG. 3 is a schematic diagram of the connection structure between the dust removal assembly and the workpiece table of the present invention.

FIG. 4 is a schematic diagram showing the cross section of the workpiece table and the connection structure of the feeding mechanism and the rotating mechanism of the present invention.

FIG. 5 is an enlarged schematic diagram of portion A in FIG. 4 of the present invention.

FIG. 6 is an enlarged schematic diagram of portion B in FIG. 4 of the present invention.

In the figure: 1, processing table; 11, workpiece table; 121, fixed plate; 12, first hydraulic cylinder; 13, jacket; 14, fixed frame; 15, second hydraulic cylinder; 16, polishing machine; 2, dust removal assembly; 21, dust plate; 22, conical collecting trough; 23, dust exhaust branch pipe; 24, dust exhaust pipe; 3, feeding mechanism; 31, first frame plate; 32, first rotating shaft; 33, transmission wheel; 34, transmission belt; 35, driving rod; 36, side plate; 37, guide Groove; 38, guide block; 39, transmission gear; 4, first rotating rod; 41, first synchronous wheel; 42, first synchronous belt; 43, teeth; 44, servo motor; 5, rotating mechanism; 51, second rotating shaft; 52, second frame plate; 53, second rotating rod; 54, second synchronous wheel; 55, second synchronous belt; 56, first transmission rod; 57, first bevel gear; 58, second transmission rod; 59, second bevel gear; 6, passive gear; 61, tooth plate.

DETAILED DESCRIPTION

The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Embodiment: As shown in Figures 1-6, the present invention provides a casting machining device that is convenient for fixing castings, including a machining table 1, a workpiece table 11 is provided on the upper surface of the machining table 1, two fixed plates 121 are fixedly installed on the upper surface of the workpiece table 11, first hydraulic cylinders 12 are provided on opposite sides of the two fixed plates 121, and jackets 13 are fixedly installed on the piston ends of the two first hydraulic cylinders 12. By arranging the first hydraulic cylinders 12 and the jackets 13, when the tubular casting to be machined is placed between the two jackets 13, by starting the first hydraulic cylinder 12, the piston end of the first hydraulic cylinder 12 extends, so that the two jackets 13 can be sleeved with the end parts of the tubular casting, thereby clamping the tubular casting, a fixed frame 14 is fixedly installed on the upper surface of the machining table 1, a second hydraulic cylinder 15 is fixedly installed on one end of the fixed frame 14, and a polisher 16 is fixedly installed on the piston end of the second hydraulic cylinder 15. By arranging the second hydraulic cylinder 15 and the polisher 16, when the second When the second hydraulic cylinder 15 is working, the second hydraulic cylinder 15 can push the grinder 16 to descend vertically. When the grinding wheel of the grinder 16 contacts the outer wall of the tubular casting, the surface of the tubular casting can be grinded and polished. This is the prior art and will not be elaborated here. A dust removal component 2 is provided on the workpiece table 11, a feeding mechanism 3 is provided between the processing table 1 and the workpiece table 11, and a rotating mechanism 5 is provided between the processing table 1 and the two first hydraulic cylinders 12. By providing the dust removal component 2, the dust removal component 2 can process the particles and debris generated during the grinding and polishing of the tubular casting to avoid the particles and debris from splashing. By providing the feeding mechanism 3, the feeding mechanism 3 can make the clamped tubular workpiece intermittently move horizontally toward one side of the grinder 16. By providing the rotating mechanism 5, the rotating mechanism 5 can make the tubular casting rotate during the intermittent movement, thereby realizing comprehensive grinding and polishing of the tubular casting and improving the convenience and efficiency of grinding and polishing of the tubular casting.

The dust removal assembly 2 includes two dust-proof plates 21. A conical collecting groove 22 is provided on the upper surface of the workpiece table 11. One end of the two dust-proof plates 21 is fixedly installed on the bottom wall of the conical collecting groove 22. The two dust-proof plates 21 are inclinedly arranged above the conical collecting groove 22. A number of evenly distributed dust exhaust branch pipes 23 are fixedly installed on the side walls of the conical collecting groove 22. A dust exhaust pipe 24 is fixedly installed on one end of the number of dust exhaust branch pipes 23. By setting two inclined dust-proof plates 21, the dust-proof plates 21 can guide the particles and debris generated during the grinding and polishing process, so that the particles and debris fall into the conical collecting groove 22 along the inclined surface of the dust-proof plates 21. When the external dust suction device is connected to the end of the dust exhaust pipe 24, the external dust suction device can suck the particles and debris in the conical collecting groove 22 through the dust exhaust pipe 24 and the dust exhaust branch pipe 23 to achieve dust removal.

The feeding mechanism 3 includes two first frame plates 31, and the two first frame plates 31 are fixedly installed on the upper surface of the processing table 1. The first rotating shafts 32 are rotatably installed on the two first frame plates 31, and one end of the two first rotating shafts 32 is fixedly installed with a transmission wheel 33. A transmission belt 34 is installed between the two transmission wheels 33, and a driving rod 35 is fixedly installed at one end of the transmission belt 34. One end of the driving rod 35 is fixedly connected to the lower surface of the workpiece table 11. By driving one of the first rotating shafts 32 to rotate, the two first rotating shafts 32 transmit the transmission belt 34 through the two transmission wheels 33. The transmission belt 34 can make the driving rod 35 move horizontally, and the driving rod 35 can make the workpiece table 11 move horizontally, so that the tubular casting between the two jackets 13 moves horizontally synchronously.

A side plate 36 is fixedly installed on the upper surface of the processing table 1, and a guide groove 37 is opened on one side of the side plate 36. A guide block 38 is slidably installed at one end of the guide groove 37. One side of the guide block 38 is fixedly connected to one side of the workpiece table 11. By setting the guide groove 37 and the guide block 38, the guide block 38 slides horizontally along the inner wall of the guide groove 37, so that the workpiece table 11 can keep moving in the horizontal direction.

A transmission gear 39 is fixedly installed on the other end of one of the first rotating shafts 32, and a first rotating rod 4 is rotatably installed on the two first frame plates 31. A first synchronous wheel 41 is fixedly installed on one end of the two first rotating rods 4. A first synchronous belt 42 is transmission-installed between the two first synchronous wheels 41, and a plurality of uniformly distributed teeth 43 are fixedly installed on one end of the first synchronous belt 42. By setting the transmission gear 39, when the transmission gear 39 rotates, the transmission gear 39 can rotate the first rotating shaft 32, and by driving one of the first rotating rods 4 to rotate, the two first rotating rods 4 can transmit the first synchronous belt 42 through the two first synchronous wheels 41, and the first synchronous belt 42 can make the teeth 43 move in a circle. When the teeth 43 mesh with the transmission gear 39, the teeth 43 can rotate the transmission gear 39, and when the teeth 43 disengage from the transmission gear 39, the transmission gear 39 stops rotating.

A servo motor 44 is fixedly installed on one side of the processing table 1, and the driving output end of the servo motor 44 is fixedly connected to the other end of one of the first rotating rods 4. By turning on the servo motor 44, the driving shaft of the servo motor 44 can rotate the first rotating rod 4.

The rotating mechanism 5 includes two second rotating shafts 51, one end of which is rotatably connected to a fixed plate 121, one end of which is fixedly connected to one end of a first hydraulic cylinder 12, two second frame plates 52 are fixedly installed on the upper surface of the workpiece table 11, a second rotating rod 53 is rotatably installed between the two second frame plates 52, both ends of the second rotating rod 53 and the other ends of the two second rotating shafts 51 are fixedly installed with second synchronous wheels 54, wherein a second synchronous belt 55 is transmission-installed between two adjacent second synchronous wheels 54, by driving the second rotating rod 53 to rotate, the second rotating rod 53 can rotate the second rotating shaft 51 through the second synchronous wheel 54 and the second synchronous belt 55, the second rotating shaft 51 can be rotated through the first hydraulic cylinder 12, and the first hydraulic cylinder 12 can synchronously rotate the tubular casting through the jacket 13.

A first transmission rod 56 is rotatably mounted at one end of the workpiece table 11, and a first bevel gear 57 is fixedly mounted at one end of the first transmission rod 56 and one end of the second rotating rod 53. The two first bevel gears 57 are meshed with each other. By driving the first transmission rod 56 to rotate, the first transmission rod 56 can rotate the second rotating rod 53 through the two first bevel gears 57.

A second transmission rod 58 is rotatably installed on the lower surface of the workpiece table 11, and a second bevel gear 59 is fixedly installed on the middle part of the second transmission rod 58 and the other end of the first transmission rod 56. The two second bevel gears 59 are meshed with each other. A passive gear 6 is fixedly installed on one end of the second transmission rod 58. A toothed plate 61 is fixedly installed on the upper surface of the processing table 1, and the toothed plate 61 is meshed and connected with the passive gear 6. When the workpiece table 11 moves horizontally, the second transmission rod 58, the second bevel gear 59, and the passive gear 6 move horizontally synchronously, the toothed plate 61 can rotate the passive gear 6, the passive gear 6 can rotate the second transmission rod 58, and the second transmission rod 58 can rotate the first transmission rod 56 through the two second bevel gears 59.

Working principle: When the tubular casting needs to be polished, the operator first places the tubular casting between the two jackets 13, and the tubular casting and the two jackets 13 are in a horizontal corresponding state, and then the two first hydraulic cylinders 12 are opened, and the piston ends of the two first hydraulic cylinders 12 are extended to push the two jackets 13 closer to each other, and the two ends of the tubular casting enter the two jackets 13 respectively and press tightly. At this time, the two jackets 13 clamp the tubular casting, and then the second hydraulic cylinder 15 is opened (in the subsequent polishing process, the piston end of the second hydraulic cylinder 15 cooperates to extend or contract), and the piston end of the second hydraulic cylinder 15 makes the grinder 16 descend vertically, so that the grinding wheel of the grinder 16 contacts the outer wall of the tubular casting;

Subsequently, the operator fixes the pipe of the external dust collection device at the end of the dust exhaust pipe 24, and turns on the servo motor 44. The driving shaft of the servo motor 44 rotates the corresponding first rotating rod 4. At this time, the two first rotating rods 4 transmit the first synchronous belt 42 through the two first synchronous wheels 41. The first synchronous belt 42 causes the plurality of teeth 43 to move in a circle. As the plurality of teeth 43 mesh with the transmission gear 39, the plurality of teeth 43 rotate the transmission gear 39. The transmission gear 39 rotates the corresponding first rotating shaft 32. At this time, the two first rotating shafts 32 transmit the transmission belt 34 through the two transmission wheels 33. The transmission belt 34 causes the driving rod 35 to move horizontally. The driving rod 35 causes the workpiece table 11 to move horizontally. The tubular casting on the workpiece table 11 moves horizontally synchronously. When the plurality of teeth 43 disengage from the transmission gear 39, the workpiece table 11 and the tubular casting stop moving horizontally. As the polishing machine 16 operates, the grinding wheel of the polishing machine 16 polishes and polishes the outer wall of the tubular casting.

During the horizontal movement of the workpiece table 11 and the tubular casting, the second transmission rod 58, the second bevel gear 59, and the driven gear 6 move horizontally synchronously with the workpiece table 11. At this time, the toothed plate 61 rotates the driven gear 6, and the driven gear 6 rotates the second transmission rod 58. The second transmission rod 58 rotates the first transmission rod 56 through the two second bevel gears 59. The first transmission rod 56 rotates the second rotating rod 53 through the two first bevel gears 57. The second rotating rod 53 rotates the two second rotating shafts 51 synchronously in the same direction through the four second synchronous wheels 54 and the two second synchronous belts 55. The two second rotating shafts 51 rotate the tubular casting synchronously through the two first hydraulic cylinders 12 and the two jackets 13. When the workpiece table 11 stops moving horizontally, the tubular casting stops rotating. With the intermittent rotation of the tubular casting, the grinding wheel of the grinder 16 performs comprehensive grinding and polishing on the surface of the tubular casting.

During the grinding and polishing process of the tubular casting, the particles and debris generated by the grinding and polishing fall on the inclined surfaces of the two dust-proof plates 21, and fall into the conical collecting trough 22 along the two inclined surfaces. As the external dust suction equipment operates, the external dust suction equipment sucks the particles and debris in the conical collecting trough 22 through the dust exhaust pipe 24 and multiple dust exhaust branch pipes 23 to prevent the particles and debris from splashing, thereby improving the convenience of cleaning the workshop environment and preventing the particles and debris from being inhaled by the operators.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims (10)

1. A casting machining device for fixing castings, comprising a machining table (1), characterized in that: a workpiece table (11) is provided on the upper surface of the machining table (1), two fixing plates (121) are fixedly mounted on the upper surface of the workpiece table (11), first hydraulic cylinders (12) are provided on opposite sides of the two fixing plates (121), and jackets (13) are fixedly mounted on the piston ends of the two first hydraulic cylinders (12), a fixed frame (14) is fixedly mounted on the upper surface of the machining table (1), a second hydraulic cylinder (15) is fixedly mounted on one end of the fixed frame (14), and a polishing machine (16) is fixedly mounted on the piston end of the second hydraulic cylinder (15), a dust removal component (2) is provided on the workpiece table (11), a feeding mechanism (3) is provided between the machining table (1) and the workpiece table (11), and a rotating mechanism (5) is provided between the machining table (1) and the two first hydraulic cylinders (12). 2. A casting machining device that is convenient for fixing castings as described in claim 1, characterized in that the dust removal assembly (2) includes two dustproof plates (21), a conical collecting groove (22) is provided on the upper surface of the workpiece table (11), one end of the two dustproof plates (21) is fixedly installed on the bottom wall of the conical collecting groove (22), and a plurality of evenly distributed dust exhaust branch pipes (23) are fixedly installed on the side wall of the conical collecting groove (22), and a dust exhaust pipe (24) is fixedly installed on one end of the plurality of dust exhaust branch pipes (23). 3. A casting machining device for facilitating the fixing of castings as described in claim 2, characterized in that the two dust-proof plates (21) are arranged obliquely above the conical collecting trough (22). 4. A casting machining device that is convenient for fixing castings as described in claim 1, characterized in that the feeding mechanism (3) includes two first frame plates (31), the two first frame plates (31) are fixedly installed on the upper surface of the processing table (1), the two first frame plates (31) are rotatably mounted with a first rotating shaft (32), one end of the two first rotating shafts (32) are fixedly mounted with a transmission wheel (33), a transmission belt (34) is installed between the two transmission wheels (33), one end of the transmission belt (34) is fixedly mounted with a driving rod (35), and one end of the driving rod (35) is fixedly connected to the lower surface of the workpiece table (11). 5. A casting machining device that is convenient for fixing castings as described in claim 4, characterized in that a side plate (36) is fixedly installed on the upper surface of the processing table (1), a guide groove (37) is opened on one side of the side plate (36), a guide block (38) is slidably installed at one end of the guide groove (37), and one side of the guide block (38) is fixedly connected to one side of the workpiece table (11). 6. A casting machining device for fixing castings as described in claim 4, characterized in that a transmission gear (39) is fixedly installed on the other end of one of the first rotating shafts (32), first rotating rods (4) are rotatably installed on the two first frame plates (31), first synchronous wheels (41) are fixedly installed on one end of the two first rotating rods (4), a first synchronous belt (42) is installed for transmission between the two first synchronous wheels (41), and a plurality of evenly distributed teeth (43) are fixedly installed on one end of the first synchronous belt (42). 7. A casting machining device for facilitating the fixing of castings as described in claim 6, characterized in that a servo motor (44) is fixedly mounted on one side of the machining table (1), and a driving output end of the servo motor (44) is fixedly connected to the other end of one of the first rotating rods (4). 8. A casting machining device for fixing castings as described in claim 1, characterized in that the rotating mechanism (5) includes two second rotating shafts (51), one end of one of the second rotating shafts (51) is rotatably connected to a fixed plate (121), one end of one of the second rotating shafts (51) is fixedly connected to one end of a first hydraulic cylinder (12), two second frame plates (52) are fixedly installed on the upper surface of the workpiece table (11), a second rotating rod (53) is rotatably installed between the two second frame plates (52), second synchronous wheels (54) are fixedly installed at both ends of the second rotating rod (53) and the other ends of the two second rotating shafts (51), and a second synchronous belt (55) is installed for transmission between two adjacent second synchronous wheels (54). 9. A casting machining device for fixing castings as described in claim 8, characterized in that a first transmission rod (56) is rotatably mounted on one end of the workpiece table (11), and a first bevel gear (57) is fixedly mounted on one end of the first transmission rod (56) and one end of the second rotating rod (53), and the two first bevel gears (57) are meshed with each other. 10. A casting machining device that is convenient for fixing castings as described in claim 9, characterized in that a second transmission rod (58) is rotatably mounted on the lower surface of the workpiece table (11), a second bevel gear (59) is fixedly mounted on the middle part of the second transmission rod (58) and the other end of the first transmission rod (56), the two second bevel gears (59) are meshed with each other, a passive gear (6) is fixedly mounted on one end of the second transmission rod (58), a tooth plate (61) is fixedly mounted on the upper surface of the processing table (1), and the tooth plate (61) is meshedly connected with the passive gear (6).