A screw terminal assembly

Abstract

The present application relates to the technical field of automatic assembly equipment of leakage protection plug, in particular to a screw terminal assembly system, comprising a working box frame, the top surface of the front half of the working box frame forms a feeding workbench surface; a step is arranged on the top surface of the front half of the working box frame; a combined feeding assembly is arranged on the feeding workbench surface; from right to left, a nut pressing mechanism, a nut detection mechanism, a screw detection mechanism, a screw twisting mechanism, a discharging mechanism, a turnover mechanism and a screw knob presence / absence detection mechanism are sequentially arranged on the step; the common conveying mechanism is arranged on the top surface of the front part of the step and behind the feeding mechanism assembly; it has the advantages that the above mechanisms can be automatically operated by a PLC controller, so as to reduce the operating workers on the assembly line and greatly improve the production efficiency per unit time.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automatic assembly equipment for leakage protection plugs, in particular to a screw terminal assembly system. BACKGROUND

[0002] With the development of society and the improvement of people's living standards, people use more and more electrical devices in life and work. More and more electrical devices need to use plugs for power consumption. Ordinary plugs only serve as a connection to the power supply. When electrical devices are in use and leakage occurs, ordinary plugs do not have any protective effect, which easily damages electrical devices and poses a safety risk to users of electrical devices. Therefore, leakage protection plugs are widely used. When a leakage protection plug is in use, when electrical leakage occurs, a part of the current in the electrical circuit will not flow back to the transformer from the live wire through the neutral wire, but will flow into the ground through the "conductor" such as the ground wire or the human body, forming a "branch" outside the main circuit. When leakage occurs, the power supply is automatically cut off before the leakage current reaches the amount of current that can harm the human body, protecting personal safety. The assembly of traditional leakage protection plugs generally adopts a semi-automatic operation mode, which cannot achieve automatic installation of the components of the leakage protection plug, resulting in low production efficiency, slow speed, increased production cost, and is not conducive to market competition in the later period. SUMMARY

[0003] The purpose of the present application is to overcome the defects and shortcomings of the prior art and provide a screw terminal assembly system.

[0004] The screw terminal assembly system provided by the present application comprises a working box frame, and the top front half of the working box frame forms a feeding workbench surface; a step is arranged on the top front half of the working box frame.

[0005] A combined feeding assembly is arranged on the feeding workbench surface; from right to left, a nut pressing mechanism, a nut detection mechanism, a screw detection mechanism, a screw twisting mechanism, a discharging mechanism, a turnover mechanism, and a screw knob presence / absence detection mechanism are arranged in sequence on the top surface of the step; and the common conveying mechanism is arranged on the top front part of the step and behind the feeding mechanism assembly.

[0006] Further, a bottom shell feeding mechanism is arranged on the right side of the working box frame.

[0007] Further, the combined feeding assembly comprises, from right to left, a nut feeding mechanism, an N terminal feeding mechanism, an E terminal feeding mechanism, an L terminal feeding mechanism, and a screw feeding mechanism which are installed in sequence on the feeding workbench surface.

[0008] Further, a control system is arranged on the right side of the top surface of the step, and the control system is a PLC controller.

[0009] Further, the bottom surface of the working box frame is provided with adjusting legs around, and the inner sides of the four adjusting legs are respectively provided with rollers.

[0010] Further, the bottom shell feeding mechanism comprises a vibrating conveying mechanism and a movable grabbing mechanism.

[0011] The vibrating conveying mechanism comprises a linear vibrating disc, and a sensor one is arranged on the linear vibrating disc. The right end of the linear vibrating disc is connected with the discharge port of the vibrating disc. The left end of the linear vibrating disc is connected with a distributing lifting cylinder. The piston rod end of the distributing lifting cylinder is provided with a tray matched with the shape of the product, and the tray is arranged at the left end of the linear vibrating disc. The distributing lifting cylinder is installed on an L-shaped supporting block. The L-shaped supporting block is connected with a supporting plate, and the supporting plate is provided with a linear vibrating disc support for supporting the linear vibrating disc. The movable grabbing mechanism is arranged on one side of the vibrating disc. The movable grabbing mechanism comprises a lower frame support one, and a left-right walking cylinder is arranged on the left side of the horizontal plate body of the lower frame support one. The left-right walking cylinder is connected with a sliding table, and a lifting cylinder is installed on the sliding table. The lifting cylinder is connected with a grabbing cylinder.

[0012] Further, the nut feeding mechanism comprises a nut vibrating disc, and the discharge port of the nut vibrating disc is connected with a nut linear vibrating disc. A sensor two is installed on the nut linear vibrating disc, and a movable grabbing mechanism is also installed on one side of the nut linear vibrating disc.

[0013] Further, the nut pressing mechanism comprises a nut pressing cylinder and a nut pressing column. The nut pressing cylinder is connected with the nut pressing column.

[0014] Further, the nut detection mechanism comprises a nut detection cylinder and a detection precision electronic ruler one. The nut detection cylinder is connected with the detection precision electronic ruler one.

[0015] Further, the screw detection mechanism comprises a screw detection cylinder and a detection precision electronic ruler two. The screw detection cylinder is connected with the detection precision electronic ruler two.

[0016] Further, the screw rotating mechanism comprises a screw knob lifting cylinder, a screw knob servo motor and a screw knob screwdriver. The screw knob lifting cylinder is installed on a screw rotating support, and the screw knob lifting cylinder is connected with a connecting plate. At least one screw knob servo motor is installed on the connecting plate, and the screw knob servo motor is connected with a screw knob screwdriver.

[0017] Further, the screw knob presence / absence detection mechanism comprises a screw detection cylinder and a detection precision electronic ruler three. The screw detection cylinder is connected with the detection precision electronic ruler three.

[0018] Further, the discharging mechanism comprises a discharging moving manipulator, a discharging lifting cylinder and a discharging grabbing cylinder; the discharging moving manipulator is installed on one side of a discharging support; the discharging support is in a lower frame shape, and two discharging lifting cylinders are arranged on the front of the horizontal part of the discharging support respectively, and the two discharging lifting cylinders are connected with two discharging grabbing cylinders respectively.

[0019] Further, the turnover mechanism comprises a turnover pushing cylinder, a turnover cylinder, a turnover mechanism, a turnover pushing-out cylinder, a discharging conveying belt motor and a discharging conveying belt; the turnover pushing cylinder is installed on one of the turnover supports, and the turnover pushing cylinder faces the turnover plate on the other turnover support on the left side of the one turnover support; the left end of the turnover plate is provided with a gear one; the gear one is engaged with a gear two, the gear two is engaged with a strip tooth, and the strip tooth is connected with the turnover cylinder; the left side of the other turnover support is provided with the discharging conveying belt, the discharging conveying belt is installed on a conveying belt support, and the conveying belt support is provided with the discharging conveying belt motor to drive the discharging conveying belt to work.

[0020] After the above structure is adopted, the screw terminal lug assembling system has the following beneficial effects: the screw terminal lug assembling system adopts the combined feeding assembly arranged on the feeding workbench; the screw cap pressing mechanism, the screw cap detection mechanism, the screw detection mechanism, the screw twisting mechanism, the discharging mechanism, the turnover mechanism and the screw knob detection mechanism are arranged on the step; the PLC controller is used to control the automatic operation of the above mechanisms, so that the operation workers on the assembly line are reduced, and the production efficiency per unit time is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application, but do not constitute improper limitations on the present application. In the drawings:

[0022] Figure 1 is a schematic view of the three-dimensional structure of the present application;

[0023] Figure 2 is a schematic view of the bottom shell feeding mechanism in the present application;

[0024] Figure 3 is a schematic view of the movable grabbing mechanism in the bottom shell feeding mechanism in the present application;

[0025] Figure 4 is a schematic view of the screw cap feeding mechanism in the present application;

[0026] Figure 5 is a schematic view of the E terminal lug feeding mechanism in the present application;

[0027] Figure 6 is a schematic view of the screw cap pressing mechanism in the present application;

[0028] Figure 7 is a structural schematic diagram of the nut detection mechanism in the application;

[0029] Figure 8 is a structural schematic diagram of the screw detection mechanism in the application;

[0030] Figure 9 is a structural schematic diagram of the screw rotation mechanism in the application;

[0031] Figure 10 is a structural schematic diagram of the screw knob presence / absence detection mechanism in the application;

[0032] Figure 11 is a structural schematic diagram of the discharging mechanism in the application;

[0033] Figure 12 is a structural schematic diagram of the turnover mechanism in the application;

[0034] Figure 13 is a structural schematic diagram of the common conveying mechanism in the application;

[0035] Explanation of reference signs:

[0036] Control system 1, bottom shell feeding mechanism 2, nut feeding mechanism 3, nut pressing mechanism 4, nut detection mechanism 5, N terminal lug feeding mechanism 6, E terminal lug feeding mechanism 7, L terminal lug feeding mechanism 8, screw feeding mechanism 9, screw detection mechanism 10, screw rotation mechanism 11, screw knob presence / absence detection mechanism 12, discharging mechanism 13, turnover mechanism 14, common conveying mechanism 15. DETAILED DESCRIPTION

[0037] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0038] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms “center”, “upper”, “lower”, “left”, “right”, “vertical”, “horizontal”, “inner”, “outer” and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0039] As Figure 1As shown, the screw terminal assembly system described in the embodiment includes a work box frame, the top surface of the work box frame is formed into a feeding workbench; the top surface of the work box frame is provided with a step;

[0040] The feeding workbench is provided with a combined feeding assembly;

[0041] The step is provided with a nut pressing mechanism 4, a nut detection mechanism 5, a screw detection mechanism 10, a screw twisting mechanism 11, a discharging mechanism 13, a turnover mechanism 14, and a screw knob detection mechanism 12 from right to left; the common conveying mechanism 15 is arranged on the top surface of the step and behind the feeding mechanism assembly.

[0042] Further, the work box frame is provided with a bottom shell feeding mechanism 2 on the right side.

[0043] Further, the combined feeding assembly is provided with a nut feeding mechanism 3, an N terminal feeding mechanism 6, an E terminal feeding mechanism 7, an L terminal feeding mechanism 8, and a screw feeding mechanism 9 installed on the feeding workbench from right to left.

[0044] Further, the top surface of the step is provided with a control system 1 on the right side, and the control system 1 is a PLC controller.

[0045] Further, the bottom surface of the work box frame is provided with four adjusting legs around the periphery, and the inner sides of the four adjusting legs are respectively provided with rollers.

[0046] Further, the bottom shell feeding mechanism 2 includes a vibration conveying mechanism and a movable grabbing mechanism.

[0047] The vibration conveying mechanism includes a linear vibration disc 22, the linear vibration disc 22 is provided with a sensor one, the right end of the linear vibration disc 22 is connected with the discharge port of the vibration disc 21; the left end of the linear vibration disc 22 is connected with a distribution lifting cylinder 23, the piston rod end of the distribution lifting cylinder 23 is provided with a tray matched with the shape of the product, and the tray is arranged at the left end of the linear vibration disc 22; the distribution lifting cylinder 23 is installed on an L-shaped support block; the L-shaped support block is connected with a supporting plate 27, the supporting plate 27 is provided with a linear vibration disc support to support the linear vibration disc;

[0048] The movable grabbing mechanism is arranged on one side of the vibration disc 21; the movable grabbing mechanism includes a lower frame support one, the left side of the horizontal plate body of the lower frame support one is provided with a left-right walking cylinder 25, the left-right walking cylinder 25 is connected with a sliding table, the sliding table is installed with a lifting cylinder 24, the lifting cylinder 24 is connected with a grabbing cylinder 26, and the grabbing cylinder 26 grabs the bottom shell to be installed in the vibration disc 21.

[0049] Further, the bottom shell loading mechanism in the design, the right end of the linear vibration disc 22 through the square opening on the left face of the work bin 28, with the discharge port of the vibration disc 21 in the work bin 28; the work bin 28 is a square box, the work bin 28 is installed on the box frame, the top surface of the work bin 28 is hinged with a bin door, which is convenient to open; the vibration disc 21 is arranged on the bottom surface in the work bin 28, and the bin door is opened, so that the bottom shell to be processed and assembled is placed in the vibration disc 21; the supporting plate 27 is installed at the bottom middle of the left face of the work bin 28.

[0050] In the design, the working principle is explained as follows: the vibration disc shakes out the bottom shell, stores the material on the linear vibration disc (linear vibration disc 22), when the inductor on the head of the linear vibration disc senses the material, the lifting cylinder rises, the grabbing lifting cylinder descends, the grabbing cylinder grabs the material, and the left-right walking cylinder walks, so that the bottom shell is sent to the assembly line.

[0051] Further, the screw cap loading mechanism 3 comprises a screw cap vibration disc 31, the discharge port of the screw cap vibration disc 31 is connected with a screw cap linear vibration disc 32, the screw cap linear vibration disc 32 is provided with a second inductor, and one movable grabbing mechanism is also installed on one side of the screw cap linear vibration disc 32.

[0052] In the design, the working principle of the screw cap loading mechanism is explained as follows: the vibration disc shakes out the screw cap (three at a time), stores the material on the linear vibration disc, when the inductor on the head of the linear vibration disc senses the material, the grabbing lifting cylinder descends, the grabbing cylinder grabs the material, the left-right walking cylinder walks, and the screw cap is sent to the bottom shell assembly line. The movable grabbing mechanism in the design is the same as the movable grabbing mechanism of the bottom shell loading mechanism 2.

[0053] Further, the screw cap pressing mechanism 4 comprises a screw cap pressing cylinder 41 and a screw cap pressing column 42; the screw cap pressing cylinder 41 is connected with the screw cap pressing column 42.

[0054] The working principle of the screw cap pressing mechanism is explained as follows: after the product is pushed to the position, the screw cap pressing cylinder descends to press the screw cap.

[0055] Further, the screw cap detection mechanism 5 comprises a screw cap detection cylinder 51 and a detection precision electronic ruler one 52; the screw cap detection cylinder 51 is connected with the detection precision electronic ruler one 52.

[0056] The working principle of the screw cap detection mechanism is explained as follows: after the product is pushed to the position, the screw cap detection cylinder descends, and the precision electronic ruler detects whether the screw cap is installed according to the contraction size.

[0057] Further, the screw detection mechanism 10 comprises a screw detection cylinder 101 and a detection precision electronic ruler two 102; the screw detection cylinder 101 is connected with the detection precision electronic ruler two 102.

[0058] The working principle of the screw detection mechanism is explained as follows: after the product is pushed to the position, the screw detection cylinder is lowered, and the precision electronic ruler detects whether the screw is installed according to the shrinkage size.

[0059] Further, the screw rotation mechanism 11 comprises a screw knob lifting cylinder 111, a screw knob servo motor 112 and a screw knob screwdriver 113; the screw knob lifting cylinder 111 is installed on the screw rotation support, the screw knob lifting cylinder 111 is connected with the connecting plate, at least one screw knob servo motor 112 is installed on the connecting plate, and the screw knob servo motor 112 is connected with the screw knob screwdriver 113.

[0060] The working principle of the screw rotation mechanism is explained as follows: in the design, three screw knob servo motors 112 are installed on the connecting plate, and the three screw knob servo motors 112 are connected with three screw knob screwdrivers 113. After the product is pushed to the position, the screw knob lifting cylinder is lowered, the servo motor is rotated to start locking the screw (three screws are locked at the same time), the servo motor stops after detecting that the screw is locked in place through the torque, and the screw knob lifting cylinder is lifted to return to the original position.

[0061] Further, the screw knob presence / absence detection mechanism 12 comprises a screw detection cylinder 121 and a detection precision electronic ruler three 122; the screw detection cylinder 121 is connected with the detection precision electronic ruler three 122.

[0062] The working principle of the screw knob presence / absence detection mechanism is explained as follows: after the product is pushed to the position, the screw detection cylinder is lowered, and the precision electronic ruler detects whether the screw with the knob is in place according to the shrinkage size (to prevent the screw from falling off or being tilted during the rotation of the knob).

[0063] Further, the discharging mechanism 13 comprises a discharging moving manipulator 131, a discharging lifting cylinder 132 and a discharging grabbing cylinder 133; the discharging moving manipulator 131 is installed on one side of the discharging support; the discharging support is in the shape of a lower frame, two discharging lifting cylinders 132 are arranged on the front sides of the horizontal part of the discharging support, and the two discharging lifting cylinders 132 are connected with two discharging grabbing cylinders 133, respectively.

[0064] The working principle of the discharging mechanism is explained as follows: after the product is pushed to the position, the discharging lifting cylinder is lowered, the discharging grabbing cylinder grabs the product, the discharging lifting cylinder is lifted, the manipulator is moved to the discharging position, the discharging lifting cylinder is lowered, the discharging grabbing cylinder releases the product, and the product enters the discharging channel.

[0065] Further, the turnover mechanism 14 comprises a turnover push cylinder 141, a turnover cylinder 142, a turnover mechanism 143, a turnover push-out cylinder 144, an outfeed conveyor belt motor 145 and an outfeed conveyor belt 146; the turnover push cylinder 141 is installed on the turnover support one, and the turnover push cylinder 141 faces the turnover plate on the turnover support two on the left side of the turnover support one; the left end of the turnover plate is provided with a gear one; the gear one is engaged with a gear two, the gear two is engaged with a strip gear, and the strip gear is connected with the turnover cylinder 142; the left side of the turnover support two is provided with the outfeed conveyor belt 146, the outfeed conveyor belt 146 is installed on a conveyor belt support, and the conveyor belt support is provided with the outfeed conveyor belt motor 145 to drive the outfeed conveyor belt 146 to work.

[0066] The working principle of the turnover mechanism is as follows: the outfeed manipulator puts the product on the turnover mechanism, the turnover push cylinder pushes the product into the turnover mechanism, the turnover cylinder acts to turn over the product, the turnover push-out cylinder pushes the product out to the outfeed conveyor belt to flow into the next process.

[0067] The N terminal lug feeding mechanism 6, the E terminal lug feeding mechanism 7, the L terminal lug feeding mechanism 8 and the screw feeding mechanism 9 in the design are the same as the bottom shell feeding mechanism 2, and all are composed of a vibration conveying mechanism and a movable grabbing mechanism.

[0068] The working principle of the N terminal lug feeding mechanism is as follows: the vibration disc shakes out the N terminal lug, and stores the material on the linear vibration disc; when the inductor on the head of the linear vibration disc senses the material, the grabbing lifting cylinder descends, the grabbing cylinder grabs the material, the left-right walking cylinder walks, and the material corner 90-degree cylinder rotates 90 degrees to send the screw cap to the bottom shell assembly line.

[0069] The difference between the E terminal lug feeding mechanism 7 and the bottom shell feeding mechanism 2 is that the material corner 90-degree cylinder 71 is added and the material lifting and descending cylinder 23 is removed; the material corner 90-degree cylinder 71 is installed on the other side of the movable grabbing mechanism; the material corner 90-degree cylinder 71 and the left-right walking cylinder are respectively installed on the two sides of the lower frame support one.

[0070] The working principle of the E terminal lug feeding mechanism is as follows: the vibration disc shakes out the E terminal lug, and stores the material on the linear vibration disc; when the inductor on the head of the linear vibration disc senses the material, the grabbing lifting cylinder descends, the grabbing cylinder grabs the material, the left-right walking cylinder walks, and the material corner 90-degree cylinder rotates 90 degrees to send the screw cap to the bottom shell assembly line.

[0071] The L terminal lug feeding mechanism 8 is the same as the E terminal lug feeding mechanism 7, and also adds the material corner 90-degree cylinder on the basis of the bottom shell feeding mechanism 2.

[0072] The working principle of the L terminal lug feeding mechanism is as follows: the vibration disc shakes out the L terminal lug, stores the material on the linear vibration disc, when the inductor on the head of the linear vibration disc senses the material, the grabbing lifting cylinder descends, the grabbing cylinder grabs the material, the left and right walking cylinders walk, and the material rotation 90-degree cylinder rotates 90 degrees, so as to send the nut into the bottom shell assembly line.

[0073] The screw feeding mechanism 9 is the same in structure as the nut feeding mechanism 3.

[0074] The working principle of the screw feeding mechanism is as follows: the vibration disc shakes out the nut (three at a time), stores the material on the linear vibration disc, when the inductor on the head of the linear vibration disc senses the material, the screw distributing cylinder distributes the material, the grabbing lifting cylinder descends, the grabbing cylinder descends, holds the screw (with a magnet inside), the left and right walking cylinders walk, and the nut is sent into the bottom shell assembly line, the grabbing cylinder rises, and the screw is separated from the magnet.

[0075] The above examples are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A screw terminal assembly system, characterized by: The utility box frame is provided with a loading workbench on the front half of the top surface of the utility box frame; a step is arranged on the front half of the top surface of the utility box frame; a combined loading assembly is arranged on the loading workbench; a nut pressing mechanism, a nut detecting mechanism, a screw detecting mechanism, a screw twisting mechanism, a discharging mechanism, a turnover mechanism and a screw knob detecting mechanism are sequentially arranged on the step from right to left; a public conveying mechanism is arranged on the top surface of the front part of the step, and the rear of the loading mechanism assembly; A bottom shell loading mechanism is arranged on the right side of the utility box frame; the combined loading assembly includes a nut loading mechanism, an N connecting piece loading mechanism, an E connecting piece loading mechanism, an L connecting piece loading mechanism and a screw loading mechanism which are sequentially arranged on the loading workbench from right to left; the bottom shell loading mechanism includes a vibrating conveying mechanism and a movable grabbing mechanism. The vibrating conveying mechanism includes a linear vibrating disc, an inductor one is arranged on the linear vibrating disc, and the right end of the linear vibrating disc is connected with the discharging port of the vibrating disc; the left end of the linear vibrating disc is connected with a distributing lifting cylinder, and a tray matched with the shape of the product is arranged on the piston rod end of the distributing lifting cylinder; the distributing lifting cylinder is installed on an L-shaped supporting block; the L-shaped supporting block is connected with a supporting plate, the supporting plate is provided with a linear vibrating disc support for supporting the linear vibrating disc; the movable grabbing mechanism is arranged on one side of the vibrating disc; the movable grabbing mechanism includes a lower frame support one, a left-right walking cylinder is arranged on the left side of the horizontal plate body of the lower frame support one, the left-right walking cylinder is connected with a sliding table, a lifting cylinder is installed on the sliding table, and the lifting cylinder is connected with a grabbing cylinder; The screw twisting mechanism includes a screw knob lifting cylinder, a screw knob servo motor and a screw knob screwdriver; the screw knob lifting cylinder is installed on a screw twisting support, the screw knob lifting cylinder is connected with a connecting plate, at least one screw knob servo motor is installed on the connecting plate, and the screw knob servo motor is connected with the screw knob screwdriver; The nut detecting mechanism includes a nut detecting cylinder and a detecting precision electronic ruler one; the nut detecting cylinder is connected with the detecting precision electronic ruler one; The screw detecting mechanism includes a screw detecting cylinder and a detecting precision electronic ruler two; the screw detecting cylinder is connected with the detecting precision electronic ruler two.

2. A screw terminal assembly system according to claim 1, wherein: A control system is arranged on the right side of the top surface of the step, and the control system is a PLC controller.

3. A screw terminal assembly system according to claim 1, wherein: The nut loading mechanism includes a nut vibrating disc, the discharging port of the nut vibrating disc is connected with a nut linear vibrating disc, an inductor two is installed on the nut linear vibrating disc, and a movable grabbing mechanism is also installed on one side of the nut linear vibrating disc.

4. A screw terminal assembly system according to claim 1, wherein: The nut pressing mechanism includes a nut pressing cylinder and a nut pressing column; the nut pressing cylinder is connected with the nut pressing column.

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