Screw driving workbench

Abstract

The utility model provides a screw driving workbench which is used for solving the problem that in the prior art, an existing electric screw machine is not beneficial to feeding back alignment position information to an industrial control device. The screw driving workbench comprises a workbench body and an electric screw machine carried on the workbench body, a workpiece fixing jig and an operation auxiliary device are arranged on the workbench body, the operation auxiliary device comprises a first swing arm part, a second swing arm part and a support, the electric screw machine is carried on the first swing arm part, and the second swing arm part is arranged on the support. The electric screw machine is vertically arranged downwards, the first swing arm piece and the second swing arm piece are rotationally connected, the support is vertically arranged, the second swing arm piece is slidably connected to the support and used for sliding up and down, and the second swing arm piece is rotationally connected to the support. The beneficial effect is that the industrial control device can timely and accurately acquire the coordinate position information of the electric screw machine.

Description

Technical Field

[0001] The utility model relates to the technical field of screw installation operations, in particular to a screw-driving workbench. Background Art

[0002] The drive cylinder refers to one of the hydraulic cylinder, pneumatic cylinder and electric cylinder. If there is a need to prevent the shaft (drive cylinder shaft) from rotating during actual use, a dual-axis or multi-axis drive cylinder can be selected, or a drive cylinder with a guide can be selected.

[0003] Screwing can be the action of tightening a screw or a threaded rod, or the action of tightening a nut. When tightening a screw, the electric screw machine uses a screwdriver bit, and when tightening a nut, the electric screw machine uses a sleeve bit. The sleeve bit and the screwdriver bit are collectively referred to as screw torque parts.

[0004] The angular displacement sensor comprises a stator, a rotor and a component arranged between the stator and the rotor and used for converting the angular displacement into an electrical signal or other control signal.

[0005] Industrial control devices refer to industrial control computers, or devices composed of one or more PLCs, single-chip microcomputers, integrated circuits, and related supporting electronic control, signal transmission, and processing modules.

[0006] During the workpiece processing, an electric screw machine is usually used to tighten the screws on the workpiece. In the existing screw tightening process, the worker puts the nut or screw in place and directly holds the screw machine to tighten the screw. In the prior art, a torque sensor is provided on the electric screw machine, and the electric screw machine is connected to the industrial control device so that the torque parameters of the electric screw machine can be displayed through the industrial control device. However, this technical solution in the prior art is not conducive to feeding back the position information of the alignment of the screw machine to the industrial control device. After the industrial control device obtains the position information of the screw machine, it is possible to indirectly match some work instructions through a program, or realize functions such as recording the work process, work leak detection, and work quality inspection.

[0007] For example, the assembly of some electronic control boxes for new energy vehicles, the assembly of some parts into the electronic control boxes, the assembly of the electronic control boxes themselves, etc., all require the work of tightening screws. Utility Model Content

[0008] The utility model provides a screw driving workbench, which is used to solve the problem in the prior art that the existing electric screw machine is not conducive to feeding back alignment position information to an industrial control device.

[0009] The technical solution adopted by the utility model to solve its technical problems is:

[0010] A screw-driving workbench, comprising a workbench and an electric screw machine mounted on the workbench, the workbench is provided with a workpiece fixing fixture and an operation auxiliary device, the operation auxiliary device comprises a first swing arm, a second swing arm and a bracket, the electric screw machine is mounted on the first swing arm, the electric screw machine is vertically arranged downward, the first swing arm and the second swing arm are rotatably connected, the bracket is vertically arranged, the second swing arm is slidably connected to the bracket for sliding up and down, and the second swing arm is rotatably connected to the bracket;

[0011] The relative rotation axis of the first swing arm member and the second swing arm member is arranged vertically;

[0012] The axis of relative rotation between the second swing arm and the bracket is arranged vertically;

[0013] A first angular displacement sensor is provided between the first swing arm and the second swing arm, and the first angular displacement sensor is used to detect the relative angular displacement between the first swing arm and the second swing arm;

[0014] A second angular displacement sensor is provided between the second swing arm and the bracket, and the second angular displacement sensor is used to detect the relative angular displacement between the second swing arm and the bracket.

[0015] The beneficial effects are:

[0016] The corresponding angular displacements fed back by the first angular displacement sensor and the second angular displacement sensor are conducive to determining the alignment coordinate position of the electric screw machine by means of an automated program, that is, when determining the alignment coordinates of the electric screw machine by programming, the utility model is conducive to providing necessary variable parameters and feedback of position information, thereby solving the problem in the prior art that the existing electric screw machine is not conducive to feedback of alignment position information to the industrial control device.

[0017] Furthermore, the first angular displacement sensor and the second angular displacement sensor are of magnetic sensitive type.

[0018] The beneficial effect is that this type of sensor has high sensitivity and small error, which is beneficial to improving the working accuracy of the equipment.

[0019] Furthermore, a display is provided on the workbench, the display is connected to an industrial control device, the industrial control device is connected to the electric screw machine, and the industrial control device is connected to the first angular displacement sensor and the second angular displacement sensor.

[0020] The beneficial effects are:

[0021] The industrial control device is connected to the electric screw machine to control the start and stop of the electric screw machine and the torque of the screws. The staff sets the tightening torque of the corresponding specification screws, the order and path of screwing on the workpiece, etc. through the input device. The industrial control device is used to record the data of the state of the workpiece (whether the screwing is completed) and the torque of the electric screw machine; and the display is used to display the state of the workpiece (whether the screwing is completed at the corresponding position) and the standard torque value specified for tightening the screws at the corresponding position in real time, which is convenient for seeing at a glance. If the operation is not in accordance with the process (the screws are not tightened in the preset order, the corresponding screws are not tightened according to the specified torque) or the screws and socket wrenches do not match the specifications, the alarm will be sounded through the alarm to facilitate the operator to deal with it in time. The logic of the industrial control device to determine the corresponding position for tightening the screws is to compare the coordinates of the electric screw machine with the corresponding screw-driving position in the same reference coordinate system. If the comparison is consistent, the electric screw machine is located at the position where the screws need to be driven. The industrial control device determines whether the corresponding position is completed and whether the screw operation is completed and qualified based on the start and stop signals of the electric screw machine at the corresponding position and whether the torque value meets the standard.

[0022] ——The utility model provides hardware support for the realization of this part of the function.

[0023] Furthermore, the workbench is provided with a taking seat, and a plurality of placement holes are provided on the taking seat, and the placement holes are used to place screw twisting parts. A first proximity switch is provided in each placement hole, and the first proximity switch is connected to the industrial control device, and the first proximity switch is used to detect whether there is a screw twisting part in the corresponding setting hole.

[0024] The beneficial effect is that the industrial control device can judge the use status of the screw twisting member through the feedback signal of the first proximity switch.

[0025] Furthermore, the workbench is provided with a marker pen box, the marker pen box is provided with a placement slot for placing the marker pen, a second proximity switch is provided in the placement slot, the second proximity switch is used to detect whether there is a marker pen in the placement slot, and the second proximity switch is connected to the industrial control device.

[0026] The beneficial effect is that after the screwing is completed, it is convenient to mark the unqualified work or the missed work.

[0027] Furthermore, the cross-section of the bracket is circular, and the bracket is fixed relative to the workbench. The second swing arm member includes a sliding block member, which is sleeved on the bracket. The bracket is rotatably connected with an upper rotating seat and a lower rotating seat, the upper rotating seat is located above the sliding block member, and the lower rotating seat is located below the sliding block member. A connecting rod is connected between the upper rotating seat and the lower rotating seat, and the second swing arm member is slidably connected to the connecting rod for sliding up and down.

[0028] The beneficial effect is: it is conducive to ensuring the accuracy of the measurement data of the second angular displacement sensor - in the process of the upper rotating seat rotating relative to the bracket, the shaking of the upper rotating seat in other dimensions relative to the bracket is reduced or even avoided (the shaking trend comes from the gravity of the first swing arm, the second swing arm, etc.), and the bracket and the rotor of the second angular displacement sensor are maintained at a one-to-one ratio as much as possible. Then the accuracy of the use of the utility model is reported.

[0029] Furthermore, the workbench is equipped with an induction box, which is used to hold screws.

[0030] Beneficial effect: The induction box is conducive to the classified storage of screws, which is convenient for staff to use.

[0031] Furthermore, the workpiece fixing fixture includes a fixed seat, a flip seat, a limit seat and a clamping assembly, the fixed seat is fixedly connected to the workbench, the flip seat is hinged on the fixed seat, the limit seat is mounted on the flip seat, the clamping assembly is arranged on the flip seat, the clamping assembly is used to clamp the workpiece on the flip seat, the flip seat can be flipped 90°, the flip seat is connected to the flip drive cylinder, and the flip drive cylinder is used to drive the flip seat to flip.

[0032] Beneficial effect: It is convenient for two mutually perpendicular surfaces fixed on the flip seat to perform screwing operations respectively.

[0033] Furthermore, the clamping assembly includes a fixed clamp and a movable clamp, the fixed clamp is fixedly connected to the flip seat, the movable clamp is mounted on a dual-axis drive cylinder, the dual-axis drive cylinder is used to adjust the distance between the fixed clamp and the movable clamp, the dual-axis drive cylinder is connected to the flip seat, the movable clamp and the fixed clamp are arranged opposite to each other, and the limit seat can be raised and lowered on the flip seat.

[0034] The beneficial effect is that it is suitable for workpieces of different sizes, such as electric boxes of different depths and fixing parts of different thicknesses.

[0035] Furthermore, the second swing arm is connected to a balance rope, the other end of the balance rope is connected to a counterweight, and a reversing member is provided on the bracket, the reversing member is located above the second swing arm, and the reversing member is used to convert the balance rope from bottom to top to bottom.

[0036] The beneficial effect is: it helps to balance the weight and reduce the operator's work intensity to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a three-dimensional schematic diagram of the utility model;

[0038] Figure 2 It is a three-dimensional schematic diagram of the work assisting device;

[0039] Figure 3 is a three-dimensional schematic diagram of the sliding sleeve;

[0040] Figure 4 is the model reference coordinate system;

[0041] Figure 5 A three-dimensional schematic diagram of a fixed fixture;

[0042] Figure 6 for Figure 5 Schematic diagram of top view;

[0043] Figure 7 for Figure 5 A rear view schematic diagram of

[0044] Figure 8 for Figure 5 A right side schematic diagram of

[0045] Fig. 9 It is the connection diagram of the industrial control device;

[0046] Fig.10 A top view schematic diagram of the access seat;

[0047] Fig.11 for Fig.10 Schematic diagram of CC cross section;

[0048] Fig.12 is a three-dimensional schematic diagram of a marker pen box;

[0049] Fig.13 It is a three-dimensional schematic diagram of the induction box;

[0050] In the figure: 1 workbench, 11 alarm, 2 display, 3 electric screw machine, 4 fixing fixture, 41 fixing seat, 42 flip seat, 421 fixing clamp, 422 movable clamp, 423 double-axis drive cylinder, 43 limit seat, 44 flip drive cylinder, 45 flip shaft, 46 limit block, 47 lifting drive cylinder, 48 connecting plate, 5 operation auxiliary device, 51 first swing arm member, 52 second swing arm member, 521 sliding sleeve, 522 middle rotating seat, 53 bracket, 531 base , 54 the first angular displacement sensor, 55 the second angular displacement sensor, 56 the slider, 561 the balance rope, 562 the counterweight, 563 the reversing member, 564 the ball, 57 the upper rotating seat, 58 the lower rotating seat, 59 the connecting rod, 6 the taking seat, 61 the placement hole, 62 the screw twisting member, 63 the first proximity switch, 7 the marker box, 71 the placement slot, 72 the second proximity switch, 73 the marker, 8 the induction box, 81 the box cover, 82 the box cover driving cylinder, 9 the industrial control device. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model. The "connection" involved in the description of the utility model can be a direct connection or a connection through an intermediate connector.

[0052] like Figure 1 As shown, the screwing workbench comprises a workbench 1 and an electric screw machine 3 mounted on the workbench 1. A workpiece fixing fixture 4 and an operation auxiliary device 5 are provided on the workbench 1.

[0053] like Figures 1 to 3 As shown, the work assisting device 5 includes a first swing arm 51, a second swing arm 52 and a bracket 53. The electric screw machine 3 is mounted on the first swing arm 51. The electric screw machine 3 is arranged vertically downward, and the "vertical downward arrangement" here means that the axis of the screwing action of the electric screw machine is vertical, and the working head of the screw twisting part of the screwing action is downward.

[0054] like Figure 2 As shown, the first swing arm 51 and the second swing arm 52 are rotatably connected, and the axis of relative rotation of the first swing arm 51 and the second swing arm 52 is vertically arranged; a first angular displacement sensor 54 is arranged between the first swing arm 51 and the second swing arm 52, and the first angular displacement sensor 54 is used to detect the relative angular displacement between the first swing arm 51 and the second swing arm 52. An intermediate rotating seat 522 is fixedly connected to the second swing arm 52, and a rotating shaft is fixedly connected to the first swing arm 51. A bearing for mounting the rotating shaft is arranged in the intermediate rotating seat 522, and the stator of the first angular displacement sensor 54 is fixedly connected to the first lower mounting box 522. The rotor of the first angular displacement sensor 54 is fixedly connected to the above-mentioned rotating shaft fixedly connected to the first swing arm 51 for synchronous rotation.

[0055] like Figure 2 and Figure 3As shown, the bracket 53 is vertically arranged, and the second swing arm member 52 is slidably connected to the bracket 53 for sliding up and down, and the second swing arm member 52 is rotatably connected to the bracket 53. The cross section of the bracket 53 is circular, that is, the bracket 53 is essentially a cylindrical rod. The bracket 53 is fixedly arranged relative to the workbench 1, and a base 531 is arranged at the lower end of the bracket 53. The bracket 53 is fixedly connected to the base 531, and the base 531 is detachably fixed to the workbench through bolts. The second swing arm member 52 includes a slider member 56, which is sleeved on the bracket 53. The slider member 56 includes a cylindrical inner cavity, and the inner cavity of the slider member 56 is provided with a plurality of ball grooves, and the ball grooves are provided with balls 564. The balls 564 are used to ensure the smoothness of the rotation and sliding of the slider member 56.

[0056] like Figure 2 As shown, the axis of relative rotation of the second swing arm 52 and the bracket 53 is arranged vertically. A second angular displacement sensor 55 is arranged between the second swing arm 52 and the bracket 53, and the second angular displacement sensor 55 is used to detect the relative angular displacement between the second swing arm 52 and the bracket 53. An upper rotating seat 57 and a lower rotating seat 58 are rotatably connected to the bracket 53, the upper rotating seat 57 is located above the slider 56, and the lower rotating seat 58 is located below the slider 56. A connecting rod 59 is connected between the upper rotating seat 57 and the lower rotating seat 58, and the second swing arm 52 is slidably connected to the connecting rod 59 for sliding up and down. The upper rotating seat 57 includes an axial hole, in which a bearing is arranged, and the outer ring of the bearing is relatively fixedly arranged with the upper rotating seat 57, and the bracket 53 is sleeved on the inner ring of the bearing, and the bracket 53 and the inner ring of the bearing are relatively fixedly connected. The stator of the second angular displacement sensor 55 is fixedly connected to the upper rotating seat 57, and the rotor of the second angular displacement sensor 55 is relatively fixedly connected with the bracket 53.

[0057] like Figure 2 As shown, the first angular displacement sensor 54 and the second angular displacement sensor 55 are of magnetic sensitive type.

[0058] like Figure 2 As shown, the second swing arm 52 is connected to a balance rope 561 - anything that is in a relatively fixed position relationship with the second swing arm 52 can be regarded as the second swing arm. The other end of the balance rope 561 is connected to a counterweight 562, and a reversing member 563 is provided on the bracket 53. The reversing member 563 is located above the second swing arm 52, and the reversing member 563 is used to convert the balance rope 561 from bottom to top to bottom. In this embodiment, an annular member is used as a reversing member to change the direction of the balance rope. A fixed pulley or other existing forms of members can also be used as a reversing member.

[0059] like Figure 1 and Figure 2As shown, the utility model is used for semi-automatic screwing work, and the utility model is suitable for screwing work of some vertically arranged screw parts. Taking the screwing of bolt parts as an example, when using the utility model to screw screws, the workpiece to be processed is positioned and fixed by the fixing fixture 4, and each bolt part is manually placed in the hole position (some can be pre-tightened), and then the staff holds the electric screw machine 3 to tighten each bolt. In the process of the staff holding the electric screw machine 3 to align the tightened bolt parts, the corresponding angular displacement feedback by the first angular displacement sensor 54 and the second angular displacement sensor 55 is conducive to determining the alignment coordinate position of the electric screw machine 3 by means of an automated program, that is, the beneficial effect of the utility model is that for the work of programmatically determining the alignment coordinates of the electric screw machine 3, the utility model is conducive to providing necessary variable parameters.

[0060] like Figure 2 and Figure 4 As shown, a model reference coordinate system is established to illustrate the principle of coordinate positioning of the electric screw machine. Point "O" represents the position of the bracket 53, point "A" represents the position of the "axis of relative rotation of the first swing arm 51 and the second swing arm 52", and point "B" represents the position of the "axis of the screwing action of the electric screw machine". The length of line segment OA is defined as L1, and the length of line segment AB is defined as L2; ​​L1 is the distance between the bracket 53 and the "axis of relative rotation of the first swing arm 51 and the second swing arm 52"; L2 is the distance between the "axis of relative rotation of the first swing arm 51 and the second swing arm 52" ​​and the "axis of the screwing action of the electric screw machine". θ1 represents the "relative angular displacement between the second swing arm 52 and the bracket 53", and θ2 represents the "relative angular displacement between the first swing arm 51 and the second swing arm 52". The coordinates of point B are defined as (X B ,Y B ). Then, according to geometric knowledge, we know that X B =L1*COSθ1+L2COS(θ1+θ2); Y B =L1*SINθ1+L2SIN(θ1+θ2). For a certain device, L1 and L2 are fixed values, so when variables θ1 and θ2 are uniquely determined, the coordinates of point B in the reference coordinate system are also uniquely determined, that is, the alignment position information of the electric screw machine is uniquely determined. After the screwing workpiece is fixed, the coordinates of the screwing position in the reference coordinate system are also uniquely determined, which is conducive to the programmatic determination of the screwing position, that is, it can be determined at which position the screw is screwed.

[0061] like Figure 2As shown, during the above-mentioned screw driving process, the counterweight 562 is used to balance the weight carried on the second swing arm 52, reducing the burden on the operator when operating the electric screw machine 3 to lift the height, which is beneficial to reducing the physical burden of the screw driving action.

[0062] like Figure 1 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the workpiece fixing fixture 4 includes a fixed seat 41, a flip seat 42, a limit seat 43 and a clamping assembly. The fixed seat 41 is fixedly connected to the workbench 1, and a hole for inserting a bolt is set on the fixed seat, and the fixed seat is detachably fixed to the workbench 1 by a bolt. The flip seat 42 is hinged on the fixed seat 41, and the flip seat 42 can flip 90°, and the flipping action takes the flip axis 45 as the axis. The flip seat 42 is connected to the flip drive cylinder 44, and the flip drive cylinder 44 is used to drive the flip seat 42 to flip; two groups of fixed seats 41 are set, and the flip drive cylinder 44 is set between the two groups of fixed seats, and the fixed seat is fixedly connected to the connecting plate 48. The workbench 1 includes a desktop and a sinking platform located below the desktop, and the connecting plate 48 is detachably fixed to the sinking platform. An articulated seat is provided on the connecting plate 48, and the cylinder body of the flip drive cylinder 44 is hinged on the articulated seat. Another articulated seat is provided at the bottom of the flip seat 42, and the action rod of the flip drive cylinder 44 is hinged on the articulated seat. The limit seat 43 is mounted on the flip seat 42, and the clamping assembly is provided on the flip seat 42. The clamping assembly is used to clamp the workpiece on the flip seat 42. The clamping assembly includes a fixed clamp 421 and a movable clamp 422. The fixed clamp 421 is fixedly connected to the flip seat 42, and the movable clamp 422 is mounted on the double-axis drive cylinder 423. The double-axis drive cylinder 423 is used to adjust the distance between the fixed clamp 421 and the movable clamp 422. The double-axis drive cylinder 423 is connected to the flip seat 42, and the movable clamp 422 and the fixed clamp 421 are arranged relative to each other. The limit seat 43 is arranged on the flip seat 42 in a liftable manner. Four lifting drive cylinders 47 are arranged on the flip seat 42. The cylinder body of the lifting drive cylinder 47 is provided with an external thread. The flip seat 42 is provided with a threaded hole matching the external thread. The cylinder body of the lifting drive cylinder 47 is threadedly connected to the flip seat. The end of the telescopic rod of the lifting drive cylinder 47 is relatively fixed to the limit seat 43. After the workpiece that needs to be screwed is placed on the limit seat 43, the workpiece is clamped and fixed by the clamping assembly, and the action of the movable clamp 422 is used to clamp or release the clamp. The limit seat 43 is provided with a placement groove, and the placement groove is shaped in accordance with the outer contour of the workpiece to be processed. If the positions of a workpiece that need to be screwed are distributed on two mutually perpendicular surfaces, then after screwing the screws on one surface, the flip seat is turned 90° by the flip drive cylinder 44, and the surface that has not been screwed is facing upwards, and the screwing work is continued after the position is changed. The limit block 46 is used to limit the flip seat after flipping.

[0063] As shown in the figure and Fig. 9 As shown, a display 2 is provided on the workbench 1, and the display 2 is connected to the industrial control device 9, and the industrial control device is connected to the data entry device. The data entry device can be a display with a touch function (also called a touch screen or touch screen), a mouse, a keyboard, a memory interface, or one or more solutions. The industrial control device 9 is connected to the electric screw machine 3 to control the start and stop of the electric screw machine 3 and control the torque of screwing. The industrial control device is connected to the first angular displacement sensor 54 and the second angular displacement sensor 55. The staff sets the tightening torque of the corresponding specification screws, the order and path of screwing on the workpiece, etc. through the input device. The industrial control device is used to record the state of the workpiece (whether the screwing is completed) and the torque of the electric screw machine; and the state of the workpiece (whether the screwing is completed at the corresponding position) and the torque standard value specified for tightening the screw at the corresponding position are displayed in real time through the display 2, which is convenient for a clear view. When the operation is not carried out according to the process (the screws are not tightened in the preset order, the corresponding screws are not tightened according to the specified torque) or the screws and socket wrenches do not match the specifications, an alarm is issued through the alarm 11, which is convenient for the operator to deal with it in time. The logic of the industrial control device 9 determining the corresponding position for tightening the screw is to compare the coordinates of the electric screw machine 3 with the corresponding screw-driving position in the same reference coordinate system. If the comparison is consistent, the electric screw machine 3 is located at the position where the screw needs to be driven. The industrial control device 9 determines whether the corresponding position has been completed and whether the screw operation at the corresponding position has been completed and whether the operation is qualified based on the start and stop signals of the electric screw machine at the corresponding position and whether the torque value meets the standard.

[0064] like Figure 1 and Fig. 9 Fig.10 As shown, a taking seat 6 is provided on the workbench 1, and a plurality of placement holes 61 are provided on the taking seat 6. The placement holes 61 are used to place screw twisting members 62, and each placement hole 61 is provided with a first proximity switch 63, which is connected to the industrial control device 9 and is used to detect whether there is a screw twisting member 62 in the corresponding setting hole. The industrial control device 9 judges the corresponding screw twisting member 62 taken through the corresponding first proximity switch 63 signal feedback, and if the taking is inaccurate, the alarm 11 sounds an alarm.

[0065] like Figure 1 , Fig. 9 , Fig.10 and Fig.11As shown, a marker pen box 7 is provided on the workbench 1, and a placement slot 71 is provided on the marker pen box 7. The placement slot 71 is used to place a marker pen 73. A second proximity switch 72 is provided in the placement slot 71. The second proximity switch 72 is used to detect whether there is a marker pen 7 in the placement slot 71. The second proximity switch 72 is connected to the industrial control device 9. The industrial control device 9 is used to feedback the situation through the second proximity switch 72 to determine whether the marker pen is taken. When the staff completes the screw tightening work of a workpiece, the display 2 is used to display the unqualified (the torque of the screw is not up to standard) position and the position of the untightened screw, and the staff uses the marker pen 7 to mark the unqualified or untightened position on the workpiece. Therefore, the utility model is conducive to the automated quality inspection of the screw tightening work completed by the equipment.

[0066] like Figure 1 and Fig.13 As shown, the workbench 1 is equipped with an induction box 8, which is used to hold screws, which are a general term for screws, bolts and nuts. During the screwing process, the staff manually takes the screws from the induction box. The induction box 8 is hinged with a box cover 81, which is used to open and close the induction box 8. When the screws are not needed, the box cover is closed and opened when they are needed. The box cover 81 is equipped with an opening and closing drive device, which includes a box cover drive cylinder 82, the cylinder body of the box cover drive cylinder 82 is fixedly connected to the induction box 8, and the end of the piston rod of the box cover drive cylinder 82 is hinged to one end of the connecting rod, and the other end of the connecting rod is hinged to a hinge seat, which is fixedly connected to the box cover 81. The opening and closing drive device is controlled by the industrial control device. For example, when a cylinder is used as the opening and closing drive device, the action of the cylinder is actuated by setting a corresponding solenoid valve, and the industrial control device controls the opening and closing of the induction box 8 by controlling the solenoid valve. The industrial control device is a mature solution in the existing technology for the electronic control of various components. When using it, you can select and assemble it according to your needs, and then program it according to existing tutorials. I will not go into details here.

Claims

1. A screw-driving workbench, comprising a workbench and an electric screw machine mounted on the workbench, characterized in that: The workbench is provided with a workpiece fixing fixture and an operation auxiliary device, the operation auxiliary device includes a first swing arm, a second swing arm and a bracket, the electric screw machine is mounted on the first swing arm, the electric screw machine is vertically arranged downward, the first swing arm and the second swing arm are rotatably connected, the bracket is vertically arranged, the second swing arm is slidably connected to the bracket for sliding up and down, and the second swing arm is rotatably connected to the bracket; The relative rotation axis of the first swing arm member and the second swing arm member is arranged vertically; The axis of relative rotation between the second swing arm and the bracket is arranged vertically; A first angular displacement sensor is provided between the first swing arm and the second swing arm, and the first angular displacement sensor is used to detect the relative angular displacement between the first swing arm and the second swing arm; A second angular displacement sensor is provided between the second swing arm and the bracket, and the second angular displacement sensor is used to detect the relative angular displacement between the second swing arm and the bracket.

2. The screw driving workbench according to claim 1, characterized in that: The first angular displacement sensor and the second angular displacement sensor are of magnetic sensitive type.

3. The screw driving workbench according to claim 1, characterized in that: The workbench is provided with a display, the display is connected to an industrial control device, the industrial control device is connected to the electric screw machine, and the industrial control device is connected to the first angular displacement sensor and the second angular displacement sensor.

4. The screw driving workbench according to claim 3, characterized in that: The workbench is provided with a taking seat, and a plurality of placement holes are provided on the taking seat. The placement holes are used to place screw twisting parts. A first proximity switch is provided in each placement hole. The first proximity switch is connected to the industrial control device and is used to detect whether there is a screw twisting part in the corresponding setting hole.

5. The screw driving workbench according to claim 4, characterized in that: The workbench is provided with a marker pen box, the marker pen box is provided with a placement slot for placing the marker pen, the placement slot is provided with a second proximity switch for detecting whether there is a marker pen in the placement slot, and the second proximity switch is connected to the industrial control device.

6. The screw driving workbench according to claim 1, characterized in that: The cross-section of the bracket is circular, and the bracket is fixed relative to the workbench. The second swing arm member includes a sliding block member, which is sleeved on the bracket. The bracket is rotatably connected with an upper rotating seat and a lower rotating seat. The upper rotating seat is located above the sliding block member, and the lower rotating seat is located below the sliding block member. A connecting rod is connected between the upper rotating seat and the lower rotating seat, and the second swing arm member is slidably connected to the connecting rod for sliding up and down.

7. The screw driving workbench according to claim 1, characterized in that: The workbench is equipped with an induction box, which is used to hold screws.

8. The screw driving workbench according to claim 1, characterized in that: The workpiece fixing fixture includes a fixed seat, a flip seat, a limit seat and a clamping assembly. The fixed seat is fixedly connected to the workbench, the flip seat is hinged on the fixed seat, the limit seat is mounted on the flip seat, and the clamping assembly is arranged on the flip seat. The clamping assembly is used to clamp the workpiece on the flip seat. The flip seat can be flipped 90°. The flip seat is connected to a flip drive cylinder, and the flip drive cylinder is used to drive the flip seat to flip.

9. The screw driving workbench according to claim 8, characterized in that: The clamping assembly includes a fixed clamp and a movable clamp, the fixed clamp is fixedly connected to the flip seat, the movable clamp is mounted on a double-axis drive cylinder, the double-axis drive cylinder is used to adjust the distance between the fixed clamp and the movable clamp, the double-axis drive cylinder is connected to the flip seat, the movable clamp and the fixed clamp are arranged opposite to each other, and the limit seat can be raised and lowered on the flip seat.

10. The screw driving workbench according to claim 1, characterized in that: The second swing arm is connected to a balance rope, the other end of the balance rope is connected to a counterweight, and a reversing member is provided on the bracket. The reversing member is located above the second swing arm, and the reversing member is used to convert the balance rope from bottom to top to bottom.

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