Multi-axis numerical control rotary table

Abstract

The utility model relates to the technical field of machining, in particular to a multi-axis numerical control rotary table which can adjust angles of workpieces on a plurality of stations in two directions, achieves complex and accurate machining and is small in limitation. Comprising a base, a rotary table and a first motor, the rotary table is rotationally installed on the base, and the first motor is installed on the base; the device further comprises a plurality of workbenches, a plurality of rotating shafts, a plurality of sliding rails, a plurality of chucks and an angle adjusting mechanism, the rotating shafts are arranged in the middles of the workbenches, the workbenches are rotationally installed on the rotary table through the rotating shafts correspondingly, the workbenches are arranged side by side along the output axis of the first motor, and the rotating shafts are perpendicular to the output shaft of the first motor. Sliding rails are installed on the multiple workbenches, the multiple sliding rails are perpendicular to an output shaft of the first motor, two chucks are installed on each sliding rail in a relatively sliding mode, an angle adjusting mechanism is installed on the rotary table, and the angle adjusting mechanism drives the multiple workbenches to synchronously rotate around the multiple rotary shafts respectively.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of machining, in particular to a multi-axis numerical control rotary table. BACKGROUND

[0002] The multi-axis numerical control rotary table is an add-on accessory arranged on the original machine tool, which can further expand the machining range of the original machine tool and enable it to complete more complex machining tasks. The use of the multi-axis numerical control rotary table can increase the degree of freedom of the workpiece during machining, improve machining precision and efficiency.

[0003] The prior art disclosed in Chinese utility model patent CN222221777U proposes a multi-station numerical control four-axis rotary table. The rotary table is cooperated with the several flat mouthed clamp bases on the bridge plate and the movable clamp body. This enables multiple parts to be clamped and batch processed during one machining process, reducing the frequency of installing and dismounting workpieces. The production efficiency of the numerical control four-axis rotary table is improved. Meanwhile, the several flat mouthed clamp bases are integrally formed on the bridge plate, so that the dimensional accuracy and positional accuracy of the flat mouthed clamp bases are consistent, reducing the influence of the clamps on the parts, and improving the practicability of the numerical control four-axis rotary table.

[0004] However, the multiple stations of the above-mentioned prior art can only rotate with the bridge plate around the drive shaft of the rotary table, and cannot rotate around the axis perpendicular to the drive shaft, resulting in a limited range of angle adjustment, and the multiple workpieces on the multiple stations cannot be adjusted in a more flexible manner, which is not conducive to achieving complex and accurate machining, and has great limitations. UTILITY MODEL CONTENTS

[0005] To solve the above technical problems, the utility model provides a multi-axis numerical control rotary table which can adjust the angle of the workpieces on the multiple stations in two directions, achieve complex and accurate machining, and has small limitations.

[0006] The utility model discloses a multi -shaft numerical control rotary table, including base, rotary table and motor no.

[0007] Preferably, the angle adjusting mechanism comprises a plurality of worm gears, a worm and a motor two, the plurality of worm gears are concentrically installed on the plurality of shafts respectively, the worm is rotatably installed on the rotary table, the worm is parallel to the output shaft of the motor one, the worm is engaged with the plurality of worm gears, the motor two is installed on the rotary table, and the output shaft of the motor two is in transmission connection with the worm.

[0008] Preferably, it further includes a top block, a push rod, a wedge block and a push cylinder one, the bottom of the rotating table is provided with a sliding groove parallel to the output shaft of the motor one, a plurality of vertical sliding grooves are arranged on the bottom of the rotating table, the plurality of vertical sliding grooves are communicated with the sliding groove, the plurality of vertical sliding grooves are respectively located below the plurality of workbenches, the plurality of top blocks are respectively and slidably installed in the plurality of vertical sliding grooves, the lower end surface of the plurality of top blocks is a slope, the push rod is slidably installed in the sliding groove of the rotating table, a plurality of wedge blocks are installed on the push rod, the upper end surface of the wedge block is provided with a slope matched with the lower end surface of the top block, the plurality of wedge blocks are respectively and slidably connected with the lower end surfaces of the plurality of top blocks, the push cylinder one is installed on the rotating table, and the piston rod of the push cylinder one is in transmission connection with the push rod; when the angles of the plurality of workbenches need to be adjusted, the piston rod of the push cylinder one drives the push rod to move along the sliding groove, so that the push rod drives the plurality of wedge blocks to move away from the plurality of top blocks, the plurality of top blocks are retracted towards the bottom of the rotating table, the plurality of top blocks are separated from the plurality of workbenches, at this time, the plurality of workbenches can be adjusted in angle, and after the angle adjustment of the plurality of workbenches is completed, the piston rod of the push cylinder one drives the push rod to move along the sliding groove and return, so that the push rod drives the plurality of wedge blocks to move close to the plurality of top blocks, the plurality of top blocks are extended outwards towards the bottom of the rotating table, and the plurality of top blocks press and lock the plurality of workbenches respectively, thereby improving the stability of workpieces on the plurality of workbenches.

[0009] Preferably, it further includes a plurality of protection tables, the plurality of protection tables are installed on the bottom of the rotating table, the plurality of protection tables are respectively located below the plurality of workbenches, the upper end surface of the plurality of protection tables is arc-shaped, and the plurality of protection tables are in sliding contact with the lower parts of the plurality of workbenches; the plurality of protection tables are arranged to reduce residual machining debris on the bottom of the plurality of workbenches and reduce the abrasion of the plurality of workbenches.

[0010] Preferably, it further includes a plurality of spacers, the spacers are installed on the opposite surfaces of the two chucks located on the same workbench; the plurality of spacers are arranged to improve the clamping reliability of workpieces.

[0011] Preferably, it further includes a plurality of driving assemblies, the plurality of driving assemblies are respectively installed on the workbenches, the driving assemblies drive the chucks to move along the sliding rails, the driving assembly includes a lead screw one, a component motor one, a lead screw two and a stepping motor two, the lead screw one and the lead screw two are rotatably installed on the workbench, the component motor one and the stepping motor two are installed on the workbench, the lead screw one and the lead screw two are parallel to the sliding rails, the output shaft of the component motor one is in transmission connection with the lead screw one, the output shaft of the stepping motor two is in transmission connection with the lead screw two, the lead screw one is in transmission connection with one chuck through a lead screw nut, and the lead screw two is in transmission connection with the other chuck through a lead screw nut; the component motor one drives the lead screw one to rotate, the stepping motor two drives the lead screw two to rotate, so that the lead screw one drives one chuck to move along the sliding rail through the lead screw nut, the lead screw two drives the other chuck to move along the sliding rail through the lead screw nut, and the two chucks clamp workpieces or adjust the positions of the workpieces, thereby being good in practicability.

[0012] Preferably, further comprising gear one, gear two, hydraulic cylinder two and gear three, gear one is concentrically installed on screw rod one, gear two is concentrically installed on screw rod two, hydraulic cylinder two is installed on the rotary table through the support, gear three is concentrically rotatably installed on the piston rod of hydraulic cylinder two, gear three is engaged with gear one and gear two, the piston rod of hydraulic cylinder two drives gear three to simultaneously disengage from gear one and gear two, so that screw rod one and screw rod two rotate respectively, thereby driving the two chucks to move along the slide rails respectively, the piston rod of hydraulic cylinder two drives gear three to simultaneously engage with gear one and gear two, at this time, component motor one or screw rod two operates, so that screw rod one and screw rod two rotate synchronously, thereby enabling the two chucks to synchronously move along the slide rails, so that the two chucks keep the clamping force on the workpiece while adjusting the position of the workpiece, and the utility is good.

[0013] Compared with the prior art, the utility model has the advantages that: during work, multiple workpieces are respectively clamped between multiple chucks on multiple worktables, motor one drives the rotary table to rotate on the base, thereby adjusting the multiple workpieces to rotate around the output shaft of motor one, enabling the multiple workpieces to synchronously perform longitudinal angle adjustment, the angle adjusting mechanism synchronously drives multiple worktables to synchronously rotate around multiple rotating shafts, enabling the multiple workpieces to synchronously perform transverse angle adjustment, realizing angle adjustment in two directions of the multiple workpieces, enabling the multiple workpieces on multiple workstations to perform more flexible angle adjustment, and being beneficial to realize complex and accurate machining, and having small limitation. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the structure schematic diagram of the utility model;

[0015] Figure 2 It is the front cut structure schematic diagram of the utility model;

[0016] Figure 3 It is the structure schematic diagram of the utility model in the exploded state;

[0017] Figure 4 It is the exploded structure schematic diagram of the structure such as rotary table, motor one, top block, push rod, wedge block, push cylinder one and protection platform;

[0018] Figure 5 It is the structure schematic diagram of the structure such as worktable, rotating shaft, slide rail and driving assembly.

[0019] Marked in the drawing: 1, base; 2, rotary table; 3, motor one; 4, worktable; 5, rotating shaft; 6, slide rail; 7, chuck; 8, worm gear; 9, worm; 10, motor two; 11, top block; 12, push rod; 13, wedge block; 14, push cylinder one; 15, protection platform; 16, gasket; 17, screw rod one; 18, component motor one; 19, screw rod two; 20, stepping motor two; 21, gear one; 22, gear two; 23, hydraulic cylinder two; 24, gear three. Detailed Implementation

[0020] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. This utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of this utility model more thorough and complete. Example 1

[0021] like Figures 1 to 5 As shown, a multi-axis CNC rotary table includes a base 1, a rotary table 2, and a motor 3. The rotary table 2 is rotatably mounted on the base 1, and the motor 3 is mounted on the base 1. The output shaft of the motor 3 is connected to the rotary table 2 via a transmission. It also includes multiple worktables 4, multiple rotating shafts 5, multiple slide rails 6, multiple chucks 7, and an angle adjustment mechanism. Each of the multiple worktables 4 has a rotating shaft 5 located in the center. The multiple worktables 4 are rotatably mounted on the rotary table 2 via multiple rotating shafts 5. The multiple worktables 4 are arranged side-by-side along the output axis of the motor 3. The multiple rotating shafts 5 are connected to the output axis of the motor 3 via a transmission. The output shafts are arranged vertically, and multiple worktables 4 are equipped with slide rails 6. These slide rails 6 are perpendicular to the output shaft of motor 3. Two chucks 7 are slidably mounted on each slide rail 6. An angle-adjusting mechanism is installed on the turntable 2, driving the multiple worktables 4 to rotate synchronously around multiple rotating shafts 5. The angle-adjusting mechanism includes multiple worm gears 8, a worm 9, and a motor 10. The multiple worm gears 8 are concentrically mounted on the multiple rotating shafts 5, and the worm 9 is rotatably mounted on the turntable 2. The worm 9 is parallel to the output shaft of motor 3 and meshes with the multiple worm gears 8. Motor 2 10 is mounted on turntable 2, and the output shaft of motor 2 10 is connected to worm gear 9 for transmission. It also includes top block 11, push rod 12, wedge block 13, and push cylinder 14. The bottom of turntable 2 is provided with a slide groove parallel to the output shaft of motor 1 3. Multiple vertical slide grooves are provided at the bottom of turntable 2, and these vertical slide grooves are connected to each other. These vertical slide grooves are located below multiple worktables 4. Multiple top blocks 11 are slidably mounted in the multiple vertical slide grooves, and the lower end face of each top block 11 is inclined. Push rod 12 is slidably mounted in the slide groove of turntable 2. Multiple wedges 13 are installed on the turntable 2. The upper end face of the wedges 13 is provided with an inclined surface that matches the lower end face of the top block 11. The multiple wedges 13 are slidably connected to the lower end faces of the multiple top blocks 11 respectively. Push cylinder 14 is installed on the turntable 2. The piston rod of push cylinder 14 is connected to push rod 12 in a transmission manner. It also includes multiple protective platforms 15. Multiple protective platforms 15 are installed on the bottom of the turntable 2. The multiple protective platforms 15 are located below the multiple worktables 4 respectively. The upper end face of the multiple protective platforms 15 is arc-shaped. The multiple protective platforms 15 are in slidable contact with the lower part of the multiple worktables 4.

[0022] In operation, the plurality of workpieces are clamped between the plurality of chucks 7 on the plurality of worktables 4, the motor 1 3 drives the rotary table 2 to rotate on the base 1, so as to adjust the plurality of workpieces to rotate around the output shaft of the motor 1 3, so that the plurality of workpieces synchronously perform longitudinal angle adjustment, the piston rod of the push cylinder 1 4 drives the push rod 1 2 to move along the sliding groove, so that the push rod 1 2 drives the plurality of wedges 1 3 to move away from the plurality of jacks 1 1 respectively, so that the plurality of jacks 1 1 shrink towards the bottom of the rotary table 2, so that the plurality of jacks 1 1 are separated from the plurality of worktables 4 respectively, at this time, the plurality of worktables 4 can be adjusted in angle, the motor 1 0 drives the worm 9 to rotate, the worm 9 engages to drive the plurality of worm gears 8 to rotate, the plurality of worm gears 8 drive the plurality of shafts 5 and the plurality of worktables 4 to rotate synchronously respectively, so as to adjust the horizontal angle of the plurality of workpieces, after the angle adjustment of the plurality of worktables 4 is completed, the piston rod of the push cylinder 1 4 drives the push rod 1 2 to move back along the sliding groove, so that the push rod 1 2 drives the plurality of wedges 1 3 to move close to the plurality of jacks 1 1 respectively, so that the plurality of jacks 1 1 extend outwards towards the bottom of the rotary table 2, so that the plurality of jacks 1 1 press and lock the plurality of worktables 4 respectively, so as to improve the stability of the workpieces on the plurality of worktables 4, so as to realize angle adjustment in two directions of the plurality of workpieces, so as to make the plurality of workpieces on the plurality of workstations to perform more flexible angle adjustment, which is beneficial to realize complex and precise machining.

[0023] The plurality of protection tables 1 5 are arranged to reduce the residual machining debris on the bottom of the plurality of worktables 4, so as to reduce the abrasion of the plurality of worktables 4. Embodiment 2

[0024] As Figure 1 , Figure 2 , Figure 3 and Figure 5As shown, based on the embodiment 1, further comprising a plurality of spacers 16, the spacers 16 are installed on the opposite sides of the two chucks 7 on the same workbench 4; further comprising a plurality of driving assemblies, the driving assemblies are respectively installed on the workbench 4, the driving assemblies drive the chucks 7 to move along the slide rails 6, the driving assemblies comprise a first screw rod 17, a first component motor 18, a second screw rod 19 and a second stepping motor 20, the first screw rod 17 and the second screw rod 19 are rotationally installed on the workbench 4, the first component motor 18 and the second stepping motor 20 are installed on the workbench 4, the first screw rod 17 and the second screw rod 19 are parallel to the slide rails 6, the output shaft of the first component motor 18 is in transmission connection with the first screw rod 17, the output shaft of the second stepping motor 20 is in transmission connection with the second screw rod 19, the first screw rod 17 is in transmission connection with one of the chucks 7 through a screw rod nut, the second screw rod 19 is in transmission connection with the other of the chucks 7 through a screw rod nut; further comprising a gear one 21, a gear two 22, a hydraulic cylinder two 23 and a gear three 24, the gear one 21 is concentrically installed on the first screw rod 17, the gear two 22 is concentrically installed on the second screw rod 19, the hydraulic cylinder two 23 is installed on the rotary table 2 through a support, the gear three 24 is rotationally installed on the piston rod of the hydraulic cylinder two 23, the gear three 24 is in meshing with the gear one 21 and the gear two 22.

[0025] The piston rod of the hydraulic cylinder two 23 drives the gear three 24 to simultaneously disengage from the gear one 21 and the gear two 22, so that the first screw rod 17 and the second screw rod 19 are respectively rotated, thereby driving the two chucks 7 to respectively move along the slide rails 6, the first component motor 18 drives the first screw rod 17 to rotate, the second stepping motor 20 drives the second screw rod 19 to rotate, so that the first screw rod 17 drives one of the chucks 7 to move along the slide rails 6 through the screw rod nut, so that the second screw rod 19 drives the other of the chucks 7 to move along the slide rails 6 through the screw rod nut, so that the two chucks 7 clamp the workpiece or adjust the position of the workpiece, and the clamping reliability of the workpiece is improved through the installation of the plurality of spacers 16;

[0026] The piston rod of the hydraulic cylinder two 23 drives the gear three 24 to simultaneously mesh with the gear one 21 and the gear two 22, at this time the first component motor 18 or the second screw rod 19 operates, so that the first screw rod 17 and the second screw rod 19 are synchronously rotated, thereby driving the two chucks 7 to synchronously move along the slide rails 6, so that the two chucks 7 maintain the clamping force of the workpiece while adjusting the position of the workpiece.

[0027] As Figures 1 to 5As shown, the multi-shaft numerical control rotary table of the utility model, when working, firstly, the component motor one 18 drives the screw rod one 17 to rotate, the stepping motor two 20 drives the screw rod two 19 to rotate, so that the screw rod one 17 drives a chuck 7 to move along the slide rail 6 through the screw rod nut, so that the screw rod two 19 drives another chuck 7 to move along the slide rail 6 through the screw rod nut, so that the two chucks 7 clamp the workpiece, then the piston rod of the hydraulic cylinder two 23 acts to drive the gear three 24 to mesh with the gear one 21 and the gear two 22 at the same time, at this time, the component motor one 18 or the screw rod two 19 operates, so that the screw rod one 17 and the screw rod two 19 rotate synchronously, so that the two chucks 7 move synchronously along the slide rail 6, so that the two chucks 7 adjust the position of the workpiece while maintaining the clamping force of the workpiece, then the motor two 10 drives the worm 9 to rotate, the worm 9 meshes to drive a plurality of worm gears 8 to rotate, and the plurality of worm gears 8 drive a plurality of rotating shafts 5 and a plurality of worktables 4 to rotate synchronously, so as to adjust the horizontal angle of a plurality of workpieces, finally, the motor one 3 drives the rotary table 2 to rotate on the base 1, so as to adjust a plurality of workpieces to rotate around the output shaft of the motor one 3, so that a plurality of workpieces are synchronously adjusted in the longitudinal direction, the angle adjustment of a plurality of workpieces in two directions is realized, a plurality of workpieces on a plurality of stations are more flexible in angle adjustment, and complex and accurate mechanical processing can be carried out.

[0028] The main functions realized by the utility model are:

[0029] 1. The workpiece on a plurality of stations can be adjusted in two directions, complex and accurate mechanical processing is realized, and the limitation is small.

[0030] 2. The horizontal position of the workpiece can be flexibly adjusted.

[0031] 3. The plurality of worktables 4 can be pressed and locked, and the stability of the workpieces on the plurality of worktables 4 is improved.

[0032] The installation mode, connection mode or setting mode of the multi-shaft numerical control rotary table of the utility model are all common mechanical modes, as long as the beneficial effects can be achieved, they can be implemented; the base 1, the rotary table 2, the motor one 3, the rotating shaft 5, the slide rail 6, the chuck 7, the worm gear 8, the worm 9, the motor two 10, the push cylinder one 14, the gasket 16, the screw rod one 17, the component motor one 18, the screw rod two 19, the stepping motor two 20, the gear one 21, the gear two 22, the hydraulic cylinder two 23 and the gear three 24 of the multi-shaft numerical control rotary table of the utility model are purchased on the market, and the technical personnel in the industry only need to install and operate according to the attached instruction manual, without the technical personnel in the field having to pay creative labor.

[0033] All the technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more of the associated listed items.

[0034] The above is only the preferred embodiment of the present application, and it should be pointed out that for those skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, and these improvements and modifications should be considered as the protection scope of the present application.

Claims

1. A multi-axis numerical control rotary table, comprising a base (1), a rotary table (2) and a motor (3), the rotary table (2) is rotatably installed on the base (1), the motor (3) is installed on the base (1), and an output shaft of the motor (3) is in transmission connection with the rotary table (2); characterized in that, It also includes a plurality of workbenches (4), a plurality of rotating shafts (5), a plurality of sliding rails (6), a plurality of clamping heads (7) and an angle adjusting mechanism, the middle part of each of the plurality of workbenches (4) is provided with a rotating shaft (5), the plurality of workbenches (4) are respectively rotatably installed on the rotating table (2) through the plurality of rotating shafts (5), the plurality of workbenches (4) are arranged side by side along the output shaft of the motor one (3), the plurality of rotating shafts (5) are arranged perpendicularly to the output shaft of the motor one (3), the sliding rails (6) are installed on the plurality of workbenches (4), the plurality of sliding rails (6) are arranged perpendicularly to the output shaft of the motor one (3), two clamping heads (7) are respectively and slidably installed on the plurality of sliding rails (6), the angle adjusting mechanism is installed on the rotating table (2), and the angle adjusting mechanism drives the plurality of workbenches (4) to synchronously rotate around the plurality of rotating shafts (5).

2. A multi-axis CNC rotary table as claimed in claim 1, wherein, The angle adjusting mechanism includes a plurality of worm gears (8), a worm gear (9) and a motor two (10), the plurality of worm gears (8) are respectively and concentrically installed on the plurality of rotating shafts (5), the worm gear (9) is rotatably installed on the rotating table (2), the worm gear (9) is parallel to the output shaft of the motor one (3), the worm gear (9) is in meshing connection with the plurality of worm gears (8), and the motor two (10) is installed on the rotating table (2). The output shaft of the motor two (10) is in transmission connection with the worm gear (9).

3. A multi-axis CNC rotary table as claimed in claim 1, wherein, It also includes a plurality of top blocks (11), a push rod (12), a plurality of wedge blocks (13) and a push cylinder one (14), the bottom of the rotating table (2) is provided with a sliding groove parallel to the output shaft of the motor one (3), the bottom of the rotating table (2) is provided with a plurality of vertical sliding grooves, the plurality of vertical sliding grooves are in communication with the sliding groove, the plurality of vertical sliding grooves are respectively located below the plurality of workbenches (4), the plurality of top blocks (11) are respectively and slidably installed in the plurality of vertical sliding grooves, the lower end surface of each of the plurality of top blocks (11) is a slope, the push rod (12) is slidably installed in the sliding groove of the rotating table (2), the plurality of wedge blocks (13) are installed on the push rod (12), the upper end surface of each of the plurality of wedge blocks (13) is provided with a slope matched with the lower end surface of the top block (11), the plurality of wedge blocks (13) are respectively in sliding connection with the lower end surfaces of the plurality of top blocks (11), and the push cylinder one (14) is installed on the rotating table (2). The piston rod of the push cylinder one (14) is in transmission connection with the push rod (12).

4. A multi-axis CNC rotary table as claimed in claim 3, wherein, It also includes a plurality of protection tables (15), the plurality of protection tables (15) are installed on the bottom of the rotating table (2), the plurality of protection tables (15) are respectively located below the plurality of workbenches (4), the upper end surfaces of the plurality of protection tables (15) are arc-shaped, and the plurality of protection tables (15) are in sliding contact with the lower parts of the plurality of workbenches (4).

5. A multi-axis CNC rotary table as claimed in claim 1, wherein, It also includes a plurality of spacers (16), and the spacers (16) are installed on the opposite surfaces of the two clamping heads (7) located on the same workbench (4).

6. A multi-axis CNC rotary table as claimed in claim 1, wherein, Also include a plurality of drive components, a plurality of drive components are respectively installed on the workbench (4), drive assembly drive chuck (7) along the slide rail (6) movement, drive assembly includes screw one (17), component motor one (18), screw two (19) and stepper motor two (20), screw one (17) and screw two (19) are rotatably mounted on the workbench (4), component motor one (18) and stepper motor two (20) are installed on the workbench (4), screw one (17) and screw two (19) are parallel to the slide rail (6), the output shaft of component motor one (18) is in transmission connection with screw one (17), the output shaft of stepper motor two (20) is in transmission connection with screw two (19), screw one (17) and a chuck (7) are driven by screw nut, screw two (19) and another chuck (7) are driven by screw nut.

7. A multi-axis CNC rotary table as claimed in claim 6, wherein, Also include gear one (21), gear two (22), hydraulic cylinder two (23) and gear three (24), gear one (21) is concentrically installed on screw one (17), gear two (22) is concentrically installed on screw two (19), hydraulic cylinder two (23) is installed on the rotary table (2) through the support, gear three (24) is concentrically rotatably installed on the piston rod of hydraulic cylinder two (23), gear three (24) is engaged with gear one (21) and gear two (22).

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