CN212122812U - Roller bearing bar cutting device of chain festival - Google Patents

Abstract

The utility model discloses a roller bar cutting device of chain link, wherein a vertical and horizontal running mechanism is arranged on a base, a clamping mechanical arm is arranged at the upper end of a vertical running plate of the vertical and horizontal running mechanism, a cutting device is arranged at one side of the clamping mechanical arm, and the operation of the vertical and horizontal running mechanism, the clamping mechanical arm and the cutting device is controlled by external high-pressure gas and circuit, the utility model finishes the cutting of clamping bar by the up-and-down movement of a cylinder control grinding wheel, the stretching of a solenoid valve control cylinder piston realizes the clamping and the releasing, the whole machine controls the electromagnet of each pneumatic reversing valve by PLC, the sequential cutting action process is finished by the driving of the cylinder, the follow-up advancing speed of a follow-up working table can also clamp a casting bar by the clamping mechanical arm to lead the casting bar to be synchronous with the casting bar, convenient modification, high productivity and the like.

Description

Roller bearing bar cutting device of chain festival

Technical Field

The utility model belongs to the technical field of a chain production equipment class technique and specifically relates to a roller bearing bar cutting device of chain festival.

Background

The initial raw materials of the connecting pins used between the sections of chains are all bar materials, the round bar material with larger diameter is a round bar material, the cylinder coil material with smaller diameter is cut into the length specified by the technology after being straightened, and then the bar materials are further processed by gold. When long-term bar stock is cut off, manual cutting is mostly carried out in a cutting machine mode, and the problem that the working efficiency of the cutting mode is low is that the processing cost is high and the man-machine configuration is more.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, an object of the utility model is to provide a roller bearing bar cutting device of chain festival, install walking mechanism with great ease on the base, the vertical running plate upper end installation of walking mechanism with great ease presss from both sides tight manipulator, and cutting device is established to one side of pressing from both sides tight manipulator, and the walking mechanism with great ease, the function of pressing from both sides tight manipulator and cutting device is moved by external high-pressure gas and circuit control, the utility model discloses reciprocate by cylinder control emery wheel and accomplish the cutting of tight bar of clamp, the flexible of solenoid valve control cylinder piston realizes pressing from both sides tightly and relaxs, and whole machine is by the electro-magnet of each pneumatic switching-over valve of PLC control, accomplishes the order cutting action process by cylinder drive, and the follow-up advancing speed of follow-up workstation also can press from both sides tight bar of clamp through pressing from both sides tight manipulator and make it, Convenient modification, high productivity and the like.

In order to achieve the above purpose, the technical scheme of the utility model is that: a roller bar cutting device of a chain link comprises a base, wherein a longitudinal and transverse traveling mechanism is mounted on the base, a clamping manipulator is mounted at the upper end of a longitudinal traveling plate of the longitudinal and transverse traveling mechanism, a cutting device is arranged on one side of the clamping manipulator, and the operation of the longitudinal and transverse traveling mechanism, the clamping manipulator and the cutting device is controlled by external high-pressure gas and a circuit to operate;

the longitudinal and transverse traveling mechanism on the base is provided with a first air cylinder, a telescopic rod at one end of the first air cylinder is connected with a fixed frame fixed at the right end of the base, the head part of the telescopic rod at the other end of the first air cylinder is provided with a first air cylinder connector, the first air cylinder connector is connected with a first lug seat, a fourth lug seat at the bottom of the transverse traveling plate is connected and fixed with a telescopic rod of the first air cylinder, two sides of the lower end of the transverse traveling plate are respectively provided with a slide block, the slide blocks are connected with a second bell-shaped guide rail at two sides of the upper end of the base in an embedded manner, two sides of the upper end of the transverse traveling plate are provided with a first linear guide rail vertical to the position of the slide block at the lower end of the longitudinal traveling plate, the middle position of the longitudinal traveling plate is provided with a second lug seat, the second air cylinder connector is connected and fixed with a third lug seat on the transverse, the transverse traveling plate is emptied relative to the transverse traveling plate and can move along the first linear guide rail under the driving of the second cylinder;

a shaft sleeve is arranged in the upper end of a fifth support of a cutting device arranged on a longitudinal and transverse travelling mechanism, a pin shaft penetrates into the shaft sleeve to connect a motor support, a motor is arranged on the motor support, one end of a second support is respectively arranged at two sides of the motor support and connected with the motor support and can swing in a pitching mode by taking the pin shaft as a reference, the other end of the second support is provided with a fourth support, a shaft is arranged in the fourth support, angular contact bearings are arranged at two ends of the shaft, an oil seal ring and a bearing end cover are arranged outside the angular contact bearings, a grinding wheel with a grinding wheel chuck arranged at two ends is arranged at one end of the shaft, a grinding wheel cover is fixed with four end surfaces of the supports and partially surrounds the grinding wheel, a first baffle plate is arranged outside the grinding wheel chuck at the outer side, the grinding wheel chuck and the grinding wheel are fixed with the shaft by fastening screws, a belt wheel is arranged at the other end of the shaft, the, the cylinder tailstock at the bottom of the cylinder III is connected with a first support, and the first support is fixed with the longitudinal walking plate;

a clamping manipulator arranged on the longitudinal and transverse traveling mechanism is arranged at one side of the cutting device, an open slot is arranged in a base II of the clamping manipulator, the bottom of the base II is fixed with a longitudinal traveling plate, a static arm is embedded in the open slot of the base II, an upper movable arm is arranged at the upper end of the open slot, a connecting block between the static arm and the upper movable arm is symmetrically connected with the open slot of the base II through a connecting shaft and is connected with the static arm and the upper movable arm to swing in an occlusion way by taking the connecting shaft as a base shaft, a cylinder IV is arranged at the upper end of the open slot of the base II, one end of the cylinder IV is fixed with the open slot of the base II through the connecting shaft, the other end of the cylinder IV is connected with a roller wheel placed on a supporting block, the roller wheel is connected with two connecting rods, the other ends of the connecting rods are respectively connected with the static arm and the, and a limiting block is arranged in the groove of the two fulcrum top blocks.

Further, a rotating shaft of the motor is connected with a belt wheel, and a first flat key is arranged in the connecting part.

The belt wheel and the shaft are connected through a key, the outer side surface of the belt wheel is provided with a baffle II, and the belt wheel and the shaft are fixed through fastening screws.

The utility model has the advantages that: the utility model discloses reciprocate by cylinder control emery wheel and accomplish the cutting of the tight bar of clamp, the flexible of solenoid valve control cylinder piston realizes pressing from both sides tightly and relaxs, whole machine is by the electro-magnet of each pneumatic reversing valve of PLC control, by the cylinder drive completion order cutting action process, the follow-up forward speed of follow-up workstation also can press from both sides tight casting stick through the clamp manipulator and make it synchronous with casting stick speed, and control is convenient, the stable performance, simple structure, and it is convenient to adjust, revise, advantages such as productivity ratio height.

Drawings

FIG. 1 is a schematic view of the present invention;

FIG. 2 is a top view of FIG. 1;

FIG. 3 is a left side view of FIG. 1;

FIG. 4 is a right side view of the clamping robot of FIG. 3;

FIG. 5 is a schematic view of the cross bar mechanism 1 of FIG. 1;

FIG. 6 is a top view of FIG. 5;

FIG. 7 is a left side view of FIG. 5;

FIG. 8 is an enlarged view taken along line A of FIG. 7;

FIG. 9 is a schematic view of the cutting apparatus of FIG. 1;

FIG. 10 is a left side view of FIG. 9;

FIG. 11 is a pneumatic schematic diagram of the present invention;

fig. 12 is a circuit connection diagram of the present invention.

In the figure: the device comprises a longitudinal and transverse traveling mechanism 1, a first cylinder joint 102, a first lug seat 103, a second lug seat 108, a slider 1010, a first linear guide rail 1011, a transverse traveling plate 1012, a first cylinder 1013, a second cylinder 1017, a third lug seat 1018, a fourth lug seat 1023, a second cylinder joint 1026, a fifth lug seat 1027, a pin shaft 1028, a first slider 1030, a second linear guide rail 1031, a longitudinal traveling plate 1032, a base 2, a cutting device 4, a first support 401, a third cylinder 402, a grinding wheel 403, a second support 404, a transmission belt 405, a third support 408, a first flat key 4013, a motor 4014, a motor support 4015, a positioning plate 4016, a cylinder tail seat 4018, a first pin shaft 4019, a shaft sleeve 4020, a first baffle 4024, a grinding wheel chuck 4025, a grinding wheel cover 4026, a fourth support 4030, a shaft 4031, a bearing end cover 4032, an oil seal ring 4033, a belt wheel 4, a key 4035, a fastening screw 4036, a second baffle 4037, an angular contact bearing 4038, a third cylinder joint 4039, a 4042, the support device comprises a support block 702, a connecting rod 703, a roller 704, a cylinder four 705, an upper movable arm 706, a fixed arm 7061, a fulcrum top block 707, a limiting block 708 and a clamping claw 709.

Detailed Description

The technical solution of the present invention is further specifically described below by way of examples and with reference to the accompanying drawings.

As shown in fig. 1 to 3, a roller bar cutting device for a chain link comprises a base 2, wherein a longitudinal and transverse traveling mechanism 1 is mounted on the base 2, a clamping manipulator 7 is mounted at the upper end of a longitudinal traveling plate 1032 of the longitudinal and transverse traveling mechanism 1, a cutting device 4 is arranged on one side of the clamping manipulator 7, and the operation of the longitudinal and transverse traveling mechanism 1, the clamping manipulator 7 and the cutting device 4 is controlled by external high-pressure gas and a circuit;

as shown in fig. 5-8, the longitudinal and transverse traveling mechanism 1 on the base 2 is provided with a cylinder 1013, a telescopic rod at one end of the cylinder 1013 is connected with a fixed frame fixed at the right end of the base 2, a cylinder joint 102 is arranged at the head of the telescopic rod at the other end of the cylinder 1013, the cylinder joint 102 is connected with a lug seat 103, a lug seat 1023 at the bottom of the transverse traveling plate 1012 is connected and fixed with a telescopic rod of the cylinder 1013, two sides of the lower end of the transverse traveling plate 1012 are respectively provided with a slide block 1030, the slide block 1030 is connected with a bell-shaped guide rail 1031 at two sides of the upper end of the base 2 in an embedded manner, two sides of the upper end of the transverse traveling plate 1012 are provided with a linear guide rail 1011 perpendicular to the position of the slide block 1030 at the lower end, the linear guide rail 1011 is connected with slide blocks 1010 at two sides of the lower end of the longitudinal traveling plate 1032, a lug seat 108 is arranged at the middle position, the telescopic rod of the second cylinder 1017 is connected with the second lug seat 108, one end of the telescopic rod of the second cylinder 1017 is provided with a second cylinder connector 1026 which is connected with the fifth lug seat 1027 through a pin 1028, and after the whole connection, the transverse walking plate 1012 vacates relative to the transverse walking plate 1012 and can move along the first linear guide rail 1011 under the driving of the second cylinder 1017;

as shown in fig. 9 to 10, a bushing 4020 is provided in the upper end of a fifth support 4042 of the cutting device 4 provided on the traverse traveling mechanism 1, a first pin 4019 penetrates into the bushing 4020 to connect the motor support 4015, a motor 4014 is provided on the motor support 4015, one end of a second support 404 is provided with two sides of the motor support 4015 respectively and is connected to the motor support 4015 and can swing in a pitching manner with the first pin 4019 as a reference, a fourth support 4030 is provided at the other end of the second support 404, a shaft 4031 is provided in the fourth support 4030, an angular contact bearing 4038 is provided at both ends of the shaft 4031, an oil seal ring 4033 and a bearing end cap 4032 are provided at the outer side of the angular contact bearing 4038, a grinding plate 403 with both ends provided with the grinding wheel chuck 4025 is installed at one end of the shaft 4031, the grinding wheel cover 4026 is fixed to the end face of the fourth support 4030 and partially surrounds the grinding plate 403, a first baffle 4024 is provided outside the grinding wheel chuck 4025 and fixes the grinding wheel chuck 403 to, a driving belt 405 is used for driving and connecting the belt wheel 4034 with a driving wheel on a rotating shaft of a motor 4014, a support III 408 with a downward support II 404 deviated from the middle position is connected with a cylinder joint III 4039 at the head part of a telescopic rod of a cylinder III 402, a cylinder tailstock 4018 at the bottom of the cylinder III 402 is connected with a support I401, and the support I401 is fixed with a longitudinal walking plate 1032;

as shown in fig. 4, a clamping manipulator 7 mounted on the longitudinal and transverse traveling mechanism 1 is arranged at one side of the cutting device 4, an open slot is arranged in a second base 701 of the clamping manipulator 7, the bottom of the open slot is fixed with a longitudinal traveling plate 1032, a fixed arm 7061 is embedded in the open slot of the second base 701, an upper movable arm 706 is arranged at the upper end of the open slot, a connecting block between the fixed arm 7061 and the upper movable arm 706 is symmetrically connected with the open slot of the second base 701 through a connecting shaft, a rear fixed arm 7061 and the upper movable arm 706 are connected and can swing in an engagement manner by taking the connecting shaft as a base shaft, a cylinder four 705 is arranged at the upper end of the open slot of the second base 701, one end of the cylinder four 705 is fixed with the open slot of the second base 701 through the connecting shaft, the other end of the cylinder four 705 is connected with a roller 704 placed on a supporting block 702, the roller 704 is connected with two connecting rods 703, the other ends of the, the other ends of the fixed arm 7061 and the upper movable arm 706 are both provided with supporting point top blocks 707 extending inwards, and the grooves of the two supporting point top blocks 707 are internally provided with limiting blocks 708.

The rotating shaft of the motor 4014 is connected with the belt wheel, and a first leveling key 4013 is arranged in the rotating shaft, so that the connecting angle position of the rotating shaft of the motor 4014 and the belt wheel is locked and fixed.

A key 4035 is arranged at the connecting end of the belt wheel 4034 and the shaft 4031, a baffle 4037 is arranged on the outer side surface of the belt wheel 4034, and the belt wheel 4034 and the shaft 4031 are fixed by a fastening screw 4036.

The technical scheme mainly comprises three large parts, namely a cutting part, a clamping part and a longitudinal and transverse walking part, wherein the cutting part is formed by driving a grinding wheel 403 to rotate by a motor 4014, and the grinding wheel 403 is controlled to move up and down by a cylinder III 402 to finish cutting. The clamping part mainly adopts a pneumatic clamping manipulator 7, and the solenoid valve controls the expansion of a cylinder piston to realize clamping and loosening. The longitudinal and transverse traveling parts are controlled by cylinders to make the traveling plates advance or return along linear guide rails, the whole machine is driven by PLC to control electromagnets of all pneumatic reversing valves, the cylinders drive the sequential cutting action process, the follow-up advancing speed of the follow-up worktable can also be synchronized with the speed of a cast rod by clamping the cast rod by a clamping manipulator, and the cutting speed during transverse cutting can be adjusted by the cylinders.

Compared with a general cutting machine, the cutting machine has the following advantages:

firstly, the effective combination of mechanical engineering and automatic control is realized, the mechanical part adopts mechanical optimization design, comprehensive technical comparison and economic evaluation are carried out in the whole design process, and the preset function is realized.

And the whole movement process is controlled by adopting pneumatic transmission, and compared with hydraulic transmission, the pneumatic transmission has the advantages of no medium cost, convenience in treatment, no leakage pollution, no medium deterioration and the like.

In the design process, the longitudinal and transverse traveling devices adopt linear guide rails, so that the movement precision of a movement system is improved, the friction force is reduced to a great extent, and the energy-saving effect is achieved.

And fourthly, the whole cutting process is controlled by PCL, and the automatic mass production requirements are met by the factors of simple and reasonable structure, good equipment performance, long service life, high safety factor and the like.

The cutting machine has the advantages of convenient control, stable performance, simple structure, convenient adjustment and modification, high production efficiency and the like, and has wide application prospect.

The device works by controlling the electromagnetic valve by the PLC, controlling the cylinder by the electromagnetic valve, driving the parts connected with the cylinder by the cylinder, realizing accurate fixed-length cutting of the cast rod, and automatically returning to the initial position after cutting. Two bars were cut with a cutting machine having a cut depth of 35mm, and then press-cut with a press-cutter.

The cast rod wire cutting machine is a novel automatic control cutting machine which can effectively improve the productivity and can be accepted by the users in the aspects of price and use. The PLC controls the electromagnets of the pneumatic reversing valves, and the cylinder drives the manipulator to complete the sequential cutting process, so that the effective combination of mechanical design, electrical appliance control and pneumatic control is realized. The cutting machine has the advantages of convenient control, stable performance, simple structure, convenient adjustment and maintenance, high production rate and the like, and has wide application prospect.

Cutting scheme: the motor drives the grinding wheel to rotate through belt transmission. The clamping mechanism not only can accurately move to each station according to a signal received in advance before cutting, but also clamps the moving cast iron rod in the cutting process to enable the grinding wheel and the cast iron rod to be synchronous. The clamping part is used for pushing the mechanical arm to realize clamping and releasing by the air cylinder. The mechanical arm is used for clamping two casting rods simultaneously, and clamping the cut casting rod according to requirements. The longitudinal and transverse traveling device is mainly used for matching with the cutting device and the clamping device, so that the grinding wheel and the clamping manipulator can transversely move in the feed process to quickly and accurately reach a working position, can longitudinally move along with a cast rod in the cutting process, and returns to an initial position after cutting. The longitudinal and transverse traveling device is mainly used for realizing the longitudinal and transverse movement of the grinding wheel of the cutting machine so as to finish the cutting action.

The technical scheme mainly comprises two parts, wherein the first part is the mechanical design of the cutting machine and mainly comprises the selection of a grinding wheel, the selection of a motor, the selection and optimization of the transmission mode of the grinding wheel, the installation of the motor and the grinding wheel, the calculation of the force of each cylinder and the parameter selection calculation thereof, the design of a sliding guide rail and the design of other parts and an integral structure, the second part is the design of an electric principle and a control part, the pneumatic control principle shown in figure 11 is started for control, and the design of an electric principle diagram, the design of a wiring diagram, the design of a control cabinet and the design of a circuit control panel are shown in figure 12.

The input device in the technical scheme is an interface device for the electrical control system to carry out signal acquisition, and signal acquisition between a human and a machine and signal acquisition between the machine and the machine are completed. The master command signal sent by the operator is sent to the control system through a button and various manual switches, and the control signal of the on-site automatic operation is sent to the control system through on-site detection equipment such as a travel switch.

The output device in the technical scheme uses the control signal sent by the control system to control the actuating mechanism, and realizes the output of required movement and the running state of the display device. The signal-driven actuators include relays, ac contactors, solenoid valves for controlling the hydraulic system, signal display lamps, and the like.

The logic control system in the technical scheme performs calculation processing on control and detection signals sent by the input equipment according to given control, converts calculation results into control signals and controls the mechanical equipment to operate through the output equipment. The devices that make up the control system are of two types: the relay control system is characterized in that control logic of the relay control system is formed by hardware, and the control logic of the relay control system is formed by programming software by a programmable controller.

The skilled person in this trade also understands, the utility model discloses do not receive the restriction of above-mentioned embodiment, the description only is the explanation in above-mentioned embodiment and the description the principle of the utility model, do not keeping away from the utility model discloses under the connection meter category prerequisite, the utility model discloses still can have various changes and improvement, these changes and improvement all fall into the protection of the utility model discloses the within range. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (3)

1. The utility model provides a roller bearing bar cutting device of chain festival which characterized in that: the automatic cutting machine comprises a base (2), wherein a longitudinal and transverse traveling mechanism (1) is installed on the base (2), a clamping mechanical arm (7) is installed at the upper end of a longitudinal traveling plate (1032) of the longitudinal and transverse traveling mechanism (1), a cutting device (4) is arranged on one side of the clamping mechanical arm (7), and the operation of the longitudinal and transverse traveling mechanism (1), the clamping mechanical arm (7) and the cutting device (4) is controlled by external high-pressure gas and a circuit;

the longitudinal and transverse traveling mechanism (1) on the base (2) is provided with a first cylinder (1013), a telescopic rod at one end of the first cylinder (1013) is connected with a fixed frame at the right end of the base (2), a first cylinder connector (102) is arranged at the head of a telescopic rod at the other end of the first cylinder (1013), the first cylinder connector (102) is connected with a first lug seat (103), four lug seats (1023) at the bottom of the transverse traveling plate (1012) are connected and fixed with the telescopic rod of the first cylinder (1013), first sliders (1030) are arranged on two sides of the lower end of the transverse traveling plate (1012), the first sliders (1030) are connected with second bell guide rails (1031) on two sides of the upper end of the base (2) in an embedded manner, first linear guide rails (1011) vertical to the first sliders (1030) at the lower end are arranged on two sides of the upper end of the transverse traveling plate (1012), the first linear guide rails (1010) are connected with sliders (1010) on two sides of the lower end of the longitudinal traveling plate (1032), and second, the connection of the cylinder II (1017) is fixed on an ear seat III (1018) on the transverse walking plate (1012), the telescopic rod of the cylinder II (1017) is connected with the ear seat II (108), one end of the telescopic rod of the cylinder II (1017) is provided with a cylinder joint II (1026) which is connected with the ear seat V (1027) by a pin shaft (1028), and after the integral connection, the transverse walking plate (1012) is emptied relatively with the transverse walking plate (1012) and can move along the linear guide rail I (1011) under the drive of the cylinder II (1017);

establish axle sleeve (4020) in the support five (4042) upper end of cutting device (4) that establish on vertically and horizontally running gear (1), round pin axle (4019) penetrates in axle sleeve (4020) and connects motor support (4015), establish motor (4014) on motor support (4015), the one end of two supports two (404) sets up motor support (4015) both sides respectively and connects and can use round pin axle one (4019) as the benchmark pitch formula swing, support four (4030) is established to the other end of support two (404), establish axle (4031) in support four (4030), the angular contact bearing (4038) of establishing at axle (4031) both ends, the oil seal ring (4033) and bearing end cover (4032) are established to the outside of angular contact bearing (4038), emery wheel piece (403) that the emery wheel chuck (4025) all adorned at both ends is installed to axle (4031) one end, emery wheel cover (4026) and support four (4030) terminal surface are fixed and partially encircle emery wheel piece (403), a first baffle plate (4024) is arranged outside the grinding wheel chuck (4025) at the outer side, the grinding wheel chuck (4025) and a grinding wheel sheet (403) are fixed with a shaft (4031) by fastening screws, a belt wheel (4034) is arranged at the other end of the shaft (4031), the belt wheel (4034) is in transmission connection with a transmission wheel on a rotating shaft of a motor (4014) by a transmission belt (405), a third support (408) arranged at the middle deviation position of a second support (404) and facing downwards is connected with a third cylinder joint (4039) at the head part of a telescopic rod of a third cylinder (402), a first cylinder tailstock (4018) at the bottom of the third cylinder (402) is connected with the first support (401), and the first support (401) is fixed with a longitudinal walking plate (1032);

a clamping mechanical arm (7) arranged on the longitudinal and transverse traveling mechanism (1) is arranged at one side of the cutting device (4), an open slot is arranged in a second base (701) of the clamping mechanical arm (7), the bottom of the second base (701) is fixed with a longitudinal traveling plate (1032), a static arm (7061) is embedded in the open slot of the second base (701), an upper movable arm (706) is arranged at the upper end of the open slot, a connecting block between the static arm (7061) and the upper movable arm (706) is symmetrically connected with the open slot of the second base (701) through a connecting shaft, the back static arm (7061) and the upper movable arm (706) can swing in a meshing manner by taking the connecting shaft as a base shaft, a fourth cylinder (705) is arranged at the upper end of the open slot of the second base (701), one end of the fourth cylinder (705) is fixed with the connecting shaft of the open slot of the second base (701), the other end of the fourth cylinder (705) is connected with a roller (704, the other ends of the connecting rods (703) are respectively connected with the fixed arm (7061) and the upper movable arm (706), the two connecting rods (703) are V-shaped after connection, the front ends of the two connecting rods are clamping claws (709), the other ends of the fixed arm (7061) and the upper movable arm (706) are respectively provided with a fulcrum top block (707) extending inwards, and a limiting block (708) is arranged in a groove of the two fulcrum top blocks (707).

2. A roller bar cutting device for chain links as claimed in claim 1, wherein: the rotating shaft of the motor (4014) is connected with the belt wheel, and a first leveling key (4013) is arranged in the rotating shaft.

3. A roller bar cutting device for chain links as claimed in claim 1, wherein: a key (4035) is arranged at the connecting end of the belt wheel (4034) and the shaft (4031), a baffle II (4037) is arranged on the outer side face of the belt wheel (4034), and the belt wheel (4034) and the shaft (4031) are fixed by fastening screws (4036).

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