A screw locking error prevention method

Abstract

The present invention discloses a screw locking error prevention method, which includes a plurality of steps executed in a cycle; the steps include: the i-th product sensing unit feeds back the i-th status information of the detected product to the control unit; the control unit controls the corresponding built-in counter to be reset to the i-th preset value according to the i-th status information, and the display unit displays the number of screws to be locked as the i-th preset value; at the same time, the i-th electric screwdriver is controlled to enter the use state, the i-th screw array feeding device is controlled to enter the normal feeding state, the remaining electric screwdrivers are kept in the locked state, and the remaining screw array feeding devices are kept in the stopped feeding state; the i-th electric screwdriver is controlled to enter the use state according to the preset force value P i The i-th preset screw with number i is fastened to the corresponding position on the product. This invention enables the same employee to accurately fasten screws of different parameters at different positions on the product at the same assembly station, improving the operability and balance of the production line and reducing working hours and employee fatigue.

Description

Technical Field

[0001] The present invention belongs to the technical field of screw locking, and in particular relates to a screw locking error-proofing method for locking screws of different models / torques at a single station. Background Art

[0002] Screw locking and assembly technology is a crucial component of electronic product assembly. While mechanized automatic screw assembly technology is becoming increasingly mature and sophisticated, manual screw assembly and locking remains essential due to limitations in product structure and assembly processes. Furthermore, the increasing complexity of electronic product structures has led to a diversification of screw types required for each location. Furthermore, due to differences in assembly materials and structures, the torque parameters required for screw locking also vary. To avoid quality risks such as mixed screw driving and incorrect assembly process parameters, process scheduling typically separates screw locking at different assembly stations, with different employees performing the operations. This, however, results in extremely poor production line operability and balance. Alternatively, the same employee is required to operate the screws at different assembly stations, increasing work hours and increasing employee fatigue.

[0003] In view of this, how to achieve the precise locking of screws of different models and torque parameters at different positions of the product at the same assembly station; to improve the operability and balance of the production line, reduce working hours and employee fatigue. Summary of the Invention

[0004] Aiming to overcome at least one of the shortcomings of the above-mentioned prior art, the technical problem solved by the present invention is to provide a screw locking error-proofing method, which can accurately complete the locking of screws of different models / torque parameters at different positions of the product at the same assembly station; improve the operability and balance of the production line, and reduce working hours and employee fatigue.

[0005] To solve the technical problems existing in the above-mentioned prior art, an embodiment of the present invention provides a screw locking error prevention method, which is implemented based on a screw locking error prevention system. The screw locking error prevention system includes a control unit, a display unit electrically connected to the control unit, N product sensing units for detecting N states of the same product, N electric screwdrivers, and N screw array feeding devices; the product sensing units, the electric screwdrivers, and the screw array feeding devices are used in a one-to-one correspondence; N is a natural number greater than or equal to 2; the error prevention method is used to sequentially complete the precise locking of screws with different parameters at different positions on the product at the same assembly station; the parameters include model and / or torque value; the error prevention method includes:

[0006] S1. In the initial state, define variable i=1;

[0007] S2. The i-th product sensing unit feeds back the i-th status information of the detected product to the control unit;

[0008] S3, the control unit controls the corresponding built-in counter to be reset to the i-th preset value according to the i-th status information, and the display unit displays the number of screws to be fastened as the i-th preset value; at the same time, the i-th electric screwdriver is controlled to enter the use state, the i-th screw array feeding device is controlled to enter the normal feeding state, the remaining electric screwdrivers are controlled to remain in the locked state, and the remaining screw array feeding devices are controlled to remain in the stopped feeding state;

[0009] S4, the i-th electric batch picks up the i-th screw supplied by the i-th screw row feeding device; then the i-th screw is locked to the corresponding position of the product in the i-th state, and the locking state information of the i-th screw is fed back to the control unit; the locking state information of the i-th screw meets the preset force value P i When , the control unit controls the counter to decrease by one, and the display unit displays the number of screws to be fastened decreased by one;

[0010] S5. Determine whether the number of screws to be fastened displayed on the display unit is zero; if not, return to step S4 to fasten the next screw No. i on the product; if so, the control unit controls the i-th electric screwdriver to enter a locking state and the i-th screw array feeding device to enter a stop feeding state;

[0011] S6. Determine whether the variable i is equal to N. If not, assign the value of the variable i+1 to i and return to step S2. If so, end the loop.

[0012] Furthermore, the screw aligning and feeding equipment includes a screw aligning machine and a screw aligning machine sealing device for opening or closing a discharge port of the screw aligning machine; the screw aligning machine sealing device is electrically connected to the control unit;

[0013] The control unit controls the sealing device of the screw aligning machine to open the discharge port of the screw aligning machine, so that the screw aligning feeding equipment enters a normal feeding state;

[0014] The control unit controls the sealing device of the screw arranging machine to close the discharge port of the screw arranging machine, so that the screw arranging feeding equipment enters a feeding stop state.

[0015] Furthermore, the sealing device of the screw aligning machine includes a driving member and a blocking member arranged on the power output part of the driving member, and the blocking member is driven by the driving member to open or close the corresponding discharge port of the screw aligning machine.

[0016] Furthermore, the screw locking error prevention system further includes an alarm unit electrically connected to the control unit; and step S4 further includes:

[0017] The locking state information of the screw No. i does not meet the preset force value P i When the number of screws to be fastened is 0, the control unit controls the counter to remain unchanged, and the display unit displays the number of screws to be fastened unchanged; at the same time, the control unit controls the alarm unit to sound an alarm.

[0018] Furthermore, the alarm unit includes a buzzer and / or an alarm indicator light.

[0019] Furthermore, the product sensing unit is provided on the product positioning tooling, and the state of the carried product is adjusted by adjusting the state of the product positioning tooling.

[0020] Furthermore, N is equal to 2; the preset force value P1≠P2.

[0021] Furthermore, the product sensing unit includes a pressure sensor or a photoelectric sensor.

[0022] Furthermore, the display unit is a six-digit digital tube or a digital display.

[0023] Furthermore, the control unit is a single chip microcomputer.

[0024] Due to the adoption of the above technical solution, the present invention has the following beneficial effects:

[0025] The screw locking error prevention method of the present invention is implemented based on the screw locking error prevention system. The screw locking error prevention system includes a control unit, a display unit electrically connected to the control unit, N product sensing units for detecting N states of the same product, N electric screwdrivers and N screw array feeding devices; the product sensing units, electric screwdrivers and screw array feeding devices are used in a one-to-one correspondence; N is a natural number greater than or equal to 2; the error prevention method is used to accurately complete the locking of screws with different parameters at different positions of the product at the same assembly station; the parameters include model and / or torque The error-proofing method mainly includes a plurality of cyclic execution steps, which are as follows: the i-th product sensing unit feeds back the i-th status information of the detected product to the control unit; the control unit controls the corresponding built-in counter to be reset to the i-th preset value according to the i-th status information, and the display unit displays the number of screws to be fastened as the i-th preset value; at the same time, the i-th electric batch is controlled to enter the use state, the i-th screw array feeding device enters the normal feeding state, the other electric batches remain in the locked state, and the other screw array feeding devices remain in the stopped feeding state; then the i-th electric batch is controlled to enter the use state according to the preset force value P i Fasten the i-th preset number i screw to the corresponding position of the product.

[0026] Because only the corresponding electric screwdriver and screw loading equipment are used when tightening one type of screw, mixing and missing screws with different parameters can be avoided. The electric screwdriver tightens the screw according to the corresponding preset force value, thus avoiding the phenomenon of incorrect tightening parameters and incomplete tightening. As a result, the same employee can accurately tighten screws of different parameters in different locations on the product at the same assembly station, improving the operability and balance of the production line and reducing working hours and employee fatigue. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 This is a principle block diagram of the screw locking error prevention system of the present invention;

[0029] Figure 2 The present invention is a flowchart of the screw locking error prevention method. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0031] Depend on Figure 1 and Figure 2 As shown together, this embodiment discloses a screw locking error prevention method, which is implemented based on a screw locking error prevention system. The screw locking error prevention system includes a control unit, a display unit electrically connected to the control unit, N product sensing units for detecting N states of the same product, N electric screwdrivers, and N screw array feeding devices; the product sensing units, electric screwdrivers, and screw array feeding devices are used in a one-to-one correspondence; N is a natural number greater than or equal to 2; the error prevention method is used to sequentially complete the precise locking of screws with different parameters at different positions of the product at the same assembly station; the parameters include model and / or torque value; the error prevention method includes:

[0032] S1. In the initial state, define variable i=1.

[0033] S2. The i-th product sensing unit feeds back the i-th status information of the detected product (the i-th status information refers to the information that the product is placed in place in the i-th status, at which time the i-th screw can be fastened at the i-th position of the product) to the control unit.

[0034] S3. The control unit resets the corresponding built-in counter to the i-th preset value based on the i-th status information, and the display unit displays the number of screws to be tightened as the i-th preset value. Simultaneously, the i-th electric screwdriver is put into use, the i-th screw train feeding device enters a normal feeding state, and the remaining electric screwdrivers remain locked and the remaining screw train feeding devices remain stopped. This prevents screws with different parameters from being screwed together.

[0035] S4, the i-th electric batch picks up the i-th screw from the i-th screw row feeding device; then the i-th screw is locked to the corresponding position of the product in the i-th state, and the locking state information of the i-th screw is fed back to the control unit; the locking state information of the i-th screw meets the preset force value P i When the number of screws to be fastened decreases, the control unit controls the counter to decrease by one, and the display unit shows the number of screws to be fastened decreases by one. In this way, the phenomenon of improper fastening due to incorrect fastening parameters can be avoided.

[0036] S5. Determine whether the number of screws to be fastened displayed on the display unit is equal to zero (i.e., whether it has been gradually reduced by one from the i-th preset value to zero through step S4); if not, return to step S4 to fasten the next i-th screw on the product; if so, the control unit controls the i-th electric screwdriver to enter the locking state and the i-th screw array feeding device to enter the stop feeding state. At this time, the i-th preset value of i-th screw is completed with the preset force value P i Lock the product at the corresponding position to avoid missing screws.

[0037] S6. Determine whether variable i is equal to N. If not, assign the value of variable i+1 to i and return to step S2. If so, end the loop. All screws are now fastened to the product. This prevents missing a screw in a certain location.

[0038] The process arrangement can concentrate the screw locking at the same assembly station and be operated by the same employee. Since only the corresponding electric screwdriver and screw loading equipment are available when performing a certain type of screw locking, it can avoid the phenomenon of screws with different parameters (models or torque values) being mixed, wrongly hit, or missed, and the electric screwdriver locks the screws according to the corresponding preset force value and set quantity, avoiding the phenomenon of incorrect locking parameters leading to incomplete locking. In short, the present invention can achieve the same employee accurately completing the locking of screws with different parameters at different positions on the product at the same assembly station; it improves the operability and balance of the production line, and employees do not need to run around at different assembly stations, reducing working hours and employee fatigue.

[0039] In this embodiment, the error-proofing method is used to fasten screws with different parameters at two locations on a product, where N is equal to 2 and the preset force value P1 ≠ P2 (for example, the preset force value P1 = 10 N·M and the preset force value P2 = 16.8 N·M). Therefore, the screw fastening cycle in this error-proofing method needs to be performed twice, with each screw fastening cycle completing the fastening of one screw. The first preset value may or may not be equal to the second preset value. In this embodiment, the first preset value = the second preset value = 5.

[0040] When two screw locking cycles are performed sequentially, starting from i=1, the first screw locking cycle (steps S2-S5) is executed first. After the first screw locking cycle is completed; i=i+1, i becomes 2 in the next cycle, and the second screw locking cycle is entered. After the second screw locking cycle steps are completed, it is determined that i=2, and the cycle ends, indicating that the product has completed the locking of all screws.

[0041] When executing the above method, it is necessary to store a data table in the control unit in advance and encode the two product sensing units, two electric screwdrivers, and two screw array loading devices.

[0042]

[0043] In one specific embodiment, the electric screwdriver includes a main body and a controller; the controller is electrically connected to a control unit; the controller collects the torque value of each screwdriver during the main body operation and feeds it back to the control unit; after the control unit sends a lock or release command, the controller begins to lock the main body's brake device (the electric screwdriver enters a locked state) or releases the main body's brake device (the electric screwdriver enters a usable state). In some embodiments, the main body's brake device is locked by stopping power supply; the main body's brake device is released by starting power supply.

[0044] In another specific embodiment, N product sensing units can be optionally installed at different locations on the product positioning tooling, and the position of the product being carried can be adjusted by adjusting the position of the product positioning tooling. The product sensing units can be selected as pressure sensors or photoelectric sensors as needed; pressure sensors with wide application range and high sensitivity are preferred.

[0045] In another specific embodiment, the display unit can be a six-digit digital tube with lower cost; or a digital display with slightly higher cost but clear display and more information can be selected; or a touch screen display can be selected, in which case the touch screen display can be used as a human-computer interaction device, and the data stored in the control unit can be directly changed without the help of a host computer; although the cost is higher, it is flexible to operate, highly integrated and portable.

[0046] In another specific embodiment, the control unit is a single-chip microcomputer or a control chip with counting, programmable and storage functions; in this embodiment, the control unit is preferably a single-chip microcomputer of model STC89C58RD; it is a low-voltage, highly encrypted, high-performance CMOS 8-bit single-chip microcomputer.

[0047] In another specific embodiment, the screw aligning and feeding device includes a screw aligning machine and a screw aligning machine sealing device for opening or closing the screw aligning machine's discharge port; the screw aligning machine sealing device is electrically connected to a control unit; the control unit controls the screw aligning machine sealing device to open the screw aligning machine's discharge port, causing the screw aligning and feeding device to enter a normal feeding state; the control unit controls the screw aligning machine sealing device to close the screw aligning machine's discharge port, causing the screw aligning and feeding device to enter a stopped feeding state. Preferably, the screw aligning and feeding device sealing device includes a driving member and a blocking member disposed on a power output portion of the driving member, the blocking member being driven by the driving member to open or close the corresponding screw aligning machine's discharge port. Preferably, the driving member is a simple-to-operate and maintenance-free pneumatic cylinder; in actual applications, an electric cylinder, a hydraulic cylinder, or other linear drive component may also be used.

[0048] In another specific embodiment, the screw locking error prevention system further includes an alarm unit electrically connected to the control unit; step S4 further includes: when the locking state information of screw No. i does not meet the preset force value P i When the screws are not properly locked and are prone to loosening, resulting in loose product assembly; or when the screws are over-locked and are prone to damage to the product, the control unit controls the counter to remain unchanged; the display unit displays the number of screws to be locked unchanged; and at the same time controls the alarm unit to sound an alarm (at this time, employees are required to confirm the fault and handle the abnormality according to the alarm). The alarm unit includes a buzzer and / or an alarm indicator light. Preferably, the alarm unit includes both a buzzer and an alarm indicator light; when an alarm occurs, the buzzer sounds and the alarm indicator light flashes, which can improve the warning effect.

[0049] The various embodiments in this specification are described in a progressive or parallel manner. Each embodiment focuses on the differences from other embodiments, and reference can be made to the common and similar parts between the various embodiments. In addition, the technical solutions of the various embodiments may be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. If the combination of technical solutions is contradictory or cannot be implemented, it shall be deemed that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0050] In summary, the present invention enables the same employee to accurately complete the locking of screws with different parameters at different positions on the product at the same assembly station; it improves the operability and balance of the production line, and reduces working hours and employee fatigue.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A screw locking error prevention method, characterized in that: Based on the implementation of the screw locking error proofing system, the screw locking error proofing system includes a control unit, a display unit electrically connected to the control unit, N product sensing units for detecting N states of the same product, N electric screwdrivers, and N screw array feeding devices; the product sensing units, the electric screwdrivers, and the screw array feeding devices are used in a one-to-one correspondence; N is a natural number greater than or equal to 2; the error proofing method is used to sequentially complete the precise locking of screws with different parameters at different positions of the product at the same assembly station; the parameters include model and / or torque value; the error proofing method includes: S1. In the initial state, define variable i=1; S2. The i-th product sensing unit feeds back the i-th status information of the detected product to the control unit; S3, the control unit controls the corresponding built-in counter to be reset to the i-th preset value according to the i-th status information, and the display unit displays the number of screws to be fastened as the i-th preset value; at the same time, the i-th electric screwdriver is controlled to enter the use state, the i-th screw array feeding device is controlled to enter the normal feeding state, the remaining electric screwdrivers are controlled to remain in the locked state, and the remaining screw array feeding devices are controlled to remain in the stopped feeding state; S4, the i-th electric batch picks up the i-th screw supplied by the i-th screw row feeding device; then the i-th screw is locked to the corresponding position of the product in the i-th state, and the locking state information of the i-th screw is fed back to the control unit; the locking state information of the i-th screw meets the preset force value P i When , the control unit controls the counter to decrease by one, and the display unit displays the number of screws to be fastened decreased by one; S5. Determine whether the number of screws to be fastened displayed on the display unit is zero; if not, return to step S4 to fasten the next screw No. i on the product; if so, the control unit controls the i-th electric screwdriver to enter a locking state and the i-th screw array feeding device to enter a stop feeding state; S6. Determine whether the variable i is equal to N. If not, assign the value of the variable i+1 to i and return to step S2. If so, end the loop.

2. The screw locking error prevention method according to claim 1, characterized in that: The screw aligning and feeding equipment includes a screw aligning machine and a screw aligning machine sealing device for opening or closing a discharge port of the screw aligning machine; the screw aligning machine sealing device is electrically connected to the control unit; The control unit controls the sealing device of the screw aligning machine to open the discharge port of the screw aligning machine, so that the screw aligning feeding equipment enters a normal feeding state; The control unit controls the sealing device of the screw arranging machine to close the discharge port of the screw arranging machine, so that the screw arranging feeding equipment enters a feeding stop state.

3. The screw locking error prevention method according to claim 2, characterized in that: The sealing device of the screw aligning machine includes a driving member and a blocking member arranged on the power output part of the driving member. The blocking member is driven by the driving member to open or close the corresponding discharge port of the screw aligning machine.

4. The screw locking error prevention method according to claim 1, characterized in that: The screw locking error prevention system further includes an alarm unit electrically connected to the control unit; and step S4 further includes: The locking state information of the screw No. i does not meet the preset force value P i When the number of screws to be fastened is 0, the control unit controls the counter to remain unchanged, and the display unit displays the number of screws to be fastened unchanged; at the same time, the control unit controls the alarm unit to sound an alarm.

5. The screw locking error prevention method according to claim 4, characterized in that: The alarm unit includes a buzzer and / or an alarm indicator light.

6. The screw locking error prevention method according to claim 1, characterized in that: The product sensing unit is arranged on the product positioning tooling, and the state of the carried product is adjusted by adjusting the state of the product positioning tooling.

7. The screw locking error prevention method according to any one of claims 1 to 6, characterized in that: N is equal to 2; the preset force value P1≠P2.

8. The screw locking error prevention method according to claim 1, characterized in that: The product sensing unit includes a pressure sensor or a photoelectric sensor.

9. The screw locking error prevention method according to claim 1, characterized in that: The display unit is a six-digit digital tube or a digital display.

10. The screw locking error prevention method according to claim 1, characterized in that: The control unit is a single chip microcomputer.

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