Double-shaft self-adaptive screw tightening device

Abstract

The invention provides a double-shaft self-adaptive screw tightening device in the technical field of battery pack production equipment, and the device comprises a bearing plate which is provided with two variable pitch grooves; the pair of guide rails are arranged on the front surface of the bearing plate in parallel and are respectively positioned above and below the variable-pitch groove; the two sliding blocks are connected with the guide rails in a sliding manner; the two self-adaptive tightening mechanisms are vertically mounted on the front surfaces of the sliding blocks respectively; the lead screw variable-pitch assembly is arranged on the back face of the bearing plate, and two driven ends of the lead screw variable-pitch assembly are connected with the sliding blocks through variable-pitch grooves correspondingly; the servo motor is arranged on the back face of the bearing plate, and the power output end of the servo motor is connected with the transmission end of the lead screw pitch changing assembly. The mounting frame is arranged on the back surface of the bearing plate; the flange plate is mounted at the top end of the mounting frame; the limiting pieces are arranged on the front face of the bearing plate and located in the middle and at the ends of the guide rails; the two cameras are respectively arranged at the bottom ends of the sliding blocks; and the two distance measuring sensors are respectively arranged on the sliding blocks. The screw tightening device has the advantage that the screw tightening quality and efficiency are greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery pack production equipment, and particularly to a biaxial adaptive screw tightening device. Background Art

[0002] During the production process of a battery pack, it is necessary to load the series-connected and parallel-connected battery cells into the battery case, then cover the battery cover above the battery case, and finally lock the battery cover to the battery case with screws, which involves the tightening of screws.

[0003] Regarding the screw tightening operation during the production process of a battery pack, traditionally, the method of manual tightening is adopted, but there are situations of missed tightening and incorrect tightening. Not only is the tightening effect average, but the tightening efficiency is also low. Although there are some automatic tightening devices, these automatic tightening devices can only tighten one screw at a time and cannot tighten adjacent screws with a height difference simultaneously, resulting in the tightening efficiency still being unsatisfactory.

[0004] Therefore, how to provide a biaxial adaptive screw tightening device to improve the quality and efficiency of screw tightening has become an urgent technical problem to be solved. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a biaxial adaptive screw tightening device to improve the quality and efficiency of screw tightening.

[0006] The present invention is implemented as follows: A biaxial adaptive screw tightening device includes:

[0007] A bearing plate, on which two variable pitch grooves are horizontally arranged in parallel;

[0008] A pair of guide rails, which are parallelly arranged on the front surface of the bearing plate and are respectively located above and below the variable pitch grooves;

[0009] Two sliders, both of which are slidably connected to the pair of guide rails;

[0010] Two adaptive tightening mechanisms, which are respectively vertically installed on the front surface of one of the sliders;

[0011] A screw rod variable pitch assembly, which is horizontally arranged on the back surface of the bearing plate, and two driven ends are respectively connected to the sliders through one of the variable pitch grooves;

[0012] A servo motor, which is arranged on the back surface of the bearing plate, and the power output end is connected to the driving end of the screw rod variable pitch assembly;

[0013] An installation frame, which is arranged on the back surface of the bearing plate;

[0014] A flange plate, which is vertically installed at the top of the installation frame;

[0015] A plurality of limit members are provided on the front surface of the carrier plate, located at the middle and ends of the guide rail, and are used to limit the moving stroke of the slider;

[0016] Two cameras are respectively provided at the bottom end of one of the sliders, and the shooting direction is downward;

[0017] Two ranging sensors are respectively provided on one of the sliders, and the measurement direction is downward.

[0018] Further, the adaptive tightening mechanism includes:

[0019] A vertical plate is installed on the front surface of the slider;

[0020] A pair of slide rails are vertically provided on the front surface of the vertical plate;

[0021] A spring floating assembly is slidably connected to a pair of the slide rails;

[0022] A cylinder is provided on the vertical plate, and the power output end is connected to the spring floating assembly;

[0023] A tightening gun is vertically installed on the spring floating assembly;

[0024] An extension rod is connected to the power output end of the tightening gun;

[0025] A sleeve is installed at the end of the extension rod.

[0026] Further, it further includes:

[0027] A PLC is respectively connected to the adaptive tightening mechanism, the servo motor, the camera and the ranging sensor.

[0028] Further, it further includes:

[0029] A communication module is connected to the PLC.

[0030] Further, the communication module is at least one of a 2G communication module, a 3G communication module, a 4G communication module, a 5G communication module, an NB-IOT communication module, a LORA communication module, a WIFI communication module, a Bluetooth communication module, a ZigBee communication module or a wired communication module.

[0031] Further, it further includes:

[0032] A display screen is connected to the PLC.

[0033] Further, the display screen is a touch display screen.

[0034] Further, it further includes:

[0035] A power supply module is connected to the PLC.

[0036] The advantages of the present invention are as follows:

[0037] 1. By providing two variable pitch grooves on the carrier plate, a pair of guide rails on the front of the carrier plate, and a screw variable pitch assembly on the back, two sliders are provided and slidably connected to the guide rails. The two driven ends of the screw variable pitch assembly are respectively connected to the sliders through a variable pitch groove, and an adaptive tightening mechanism is installed on each of the two sliders. The screw variable pitch assembly is driven by a servo motor. That is, by driving the screw variable pitch assembly to rotate by the servo motor, the sliders can be linked to move towards or away from each other on the guide rails to vary the pitch of the two adaptive tightening mechanisms and match different screw pitches; and the adaptive tightening mechanism is provided with a spring floating assembly. The tightening gun is connected to the sleeve through the spring floating assembly and an extension rod. When tightening the screw through the sleeve, the spring floating assembly is first pre-pressed in stroke to cover the height change in the tightening direction after the screw is tightened in place, ensuring the stability and reliability of the tightening process. That is, by the two adaptive tightening mechanisms, two screws can be tightened simultaneously, and screws with a height difference are compatible, ultimately greatly improving the quality and efficiency of screw tightening.

[0038] 2. By providing a distance measuring sensor, the pre-pressing value of the spring floating assembly can be measured to avoid applying excessive pressure during the pre-pressing process and further ensure the quality of screw tightening. Description of the Drawings

[0039] The following further describes the present invention with reference to the drawings in conjunction with embodiments.

[0040] Figure 1 is one of the structural schematic diagrams of a dual-axis adaptive screw tightening device of the present invention.

[0041] Figure 2 is the second of the structural schematic diagrams of a dual-axis adaptive screw tightening device of the present invention.

[0042] Figure 3 is the rear view of a dual-axis adaptive screw tightening device of the present invention.

[0043] Figure 4 is the structural schematic diagram of the adaptive tightening mechanism of the present invention.

[0044] Figure 5 is the circuit principle block diagram of a dual-axis adaptive screw tightening device of the present invention.

[0045] Marking Description:

[0046] 100 - A dual - axis adaptive screw tightening device, 1 - bearing plate, 2 - guide rail, 3 - slider, 4 - adaptive tightening mechanism, 5 - screw pitch changing assembly, 6 - servo motor, 7 - mounting bracket, 8 - flange, 9 - limiting part, 10 - camera, 20 - distance measuring sensor, 30 - PLC, 40 - communication module, 50 - display screen, 60 - power module, 11 - pitch - changing groove, 41 - vertical plate, 42 - slide rail, 43 - spring floating assembly, 44 - cylinder, 45 - tightening gun, 46 - extension rod, 47 - sleeve. Specific embodiments

[0047] The technical solution in the embodiment of the present application has the following general idea: The screw pitch changing assembly 5 is driven by the servo motor 6 to rotate, so as to link the slider 3 to move towards or away from each other on the guide rail 2, and then change the pitch of the two adaptive tightening mechanisms 4 to match different screw pitches; The adaptive tightening mechanism 4 is provided with a spring floating assembly 43. When tightening the screw, the stroke of the spring floating assembly 43 is pre - pressed first to cover the height change in the tightening direction after the screw is tightened in place, ensuring the stability and reliability of the tightening process. That is, the two adaptive tightening mechanisms 4 are used to tighten two screws simultaneously and are compatible with screws having a height difference, thereby improving the quality and efficiency of screw tightening.

[0048] Please refer to Figures 1 to 5 As shown in the figure, a preferred embodiment of a dual - axis adaptive screw tightening device 100 of the present invention includes:

[0049] A bearing plate 1, with two pitch - changing grooves 11 arranged horizontally in parallel; the bearing plate 1 is used to carry the dual - axis adaptive screw tightening device 100; the pitch - changing groove 11 is used to provide space for the transmission of the screw pitch changing assembly 5;

[0050] A pair of guide rails 2, arranged in parallel on the front surface of the bearing plate 1, respectively above and below the pitch - changing groove 11, for the limiting sliding of the slider 3;

[0051] Two sliders 3, both slidably connected to the pair of guide rails 2, for linking the adaptive tightening mechanism 4 to change the pitch;

[0052] Two adaptive tightening mechanisms 4, respectively vertically installed on the front surface of one slider 3, for automatically tightening screws (not shown);

[0053] A screw pitch changing assembly 5, horizontally arranged on the back surface of the bearing plate 1, with two driven ends respectively connected to the slider 3 through one pitch - changing groove 11, for linking the two sliders 3 to change the pitch;

[0054] A servo motor 6 is provided on the back surface of the carrier plate 1, and its power output end is connected to the transmission end of the screw pitch-changing assembly 5, and is used to drive the screw pitch-changing assembly 5 to rotate so as to drive the slider 3 to change the pitch;

[0055] A mounting bracket 7 is provided on the back surface of the carrier plate 1 and is used to mount the flange 8;

[0056] A flange 8 is vertically mounted on the top end of the mounting bracket 7 and is used to connect a robotic arm (not shown);

[0057] A plurality of limit members 9 are provided on the front surface of the carrier plate 1, at the middle and ends of the guide rail 2, and are used to limit the moving stroke of the slider 3;

[0058] Two cameras 10 are respectively provided at the bottom end of one of the sliders 3, and the shooting directions are downward, and are used to perform visual positioning on the positions of the screws;

[0059] Two distance measuring sensors 20 are respectively provided on one of the sliders 3, and the measuring directions are downward, and are used to sense the pre-pressure value of the adaptive tightening mechanism 4 downward.

[0060] The adaptive tightening mechanism 4 includes:

[0061] A vertical plate 41 is mounted on the front surface of the slider 3 and is used to carry the adaptive tightening mechanism 4;

[0062] A pair of slide rails 42 are vertically provided on the front surface of the vertical plate 41 and are used for the limiting sliding of the spring floating assembly 43;

[0063] A spring floating assembly 43 is slidably connected to a pair of the slide rails 42 and is used to provide buoyancy (elastic force) in the height direction to match screws with different height differences;

[0064] A cylinder 44 is provided on the vertical plate 41, and its power output end is connected to the spring floating assembly 43 and is used to drive the spring floating assembly 43 to lift and pre-press;

[0065] A tightening gun 45 is vertically mounted on the spring floating assembly 43 and is used to provide power for tightening the screws;

[0066] An extension rod 46 is connected to the power output end of the tightening gun 45;

[0067] A sleeve 47 is mounted at the end of the extension rod 46 and is used to sleeve the screws to tighten the screws.

[0068] It further includes:

[0069] A PLC 30 is respectively connected to the adaptive tightening mechanism 4, the servo motor 6, the camera 10 and the ranging sensor 20, and is used to control the operation of the dual-axis adaptive screw tightening device.

[0070] It further includes:

[0071] A communication module 40 is connected to the PLC 30 and is used for the dual-axis adaptive screw tightening device 100 to communicate with the outside world.

[0072] The communication module 40 is at least one of a 2G communication module, a 3G communication module, a 4G communication module, a 5G communication module, an NB-IOT communication module, a LORA communication module, a WIFI communication module, a Bluetooth communication module, a ZigBee communication module or a wired communication module.

[0073] It further includes:

[0074] A display screen 50 is connected to the PLC 30 and is used to control the dual-axis adaptive screw tightening device 100.

[0075] The display screen 50 is a touch display screen.

[0076] It further includes:

[0077] A power supply module 60 is connected to the PLC 30 and is used to supply power to the dual-axis adaptive screw tightening device 100.

[0078] The working principle of the present invention:

[0079] The dual-axis adaptive screw tightening device 100 is connected to a robotic arm (not shown) through the flange 8. The robotic arm moves the adaptive tightening mechanism 4 above the screw to be tightened. After the PLC 30 performs visual positioning on the screw through the camera 10, the servo motor 6 is used to change the distance of the two adaptive tightening mechanisms 4. The cylinder 44 drives the sleeve 47 to move down and sleeve on the screw, and performs stroke preloading on the spring floating assembly 43 until the preloading is sensed to be in place by the ranging sensor 20, and then the tightening gun 45 performs the tightening operation.

[0080] In summary, the advantages of the present invention are:

[0081] 1. By providing two variable pitch grooves on the bearing plate, a pair of guide rails on the front of the bearing plate, and a screw variable pitch assembly on the back, two sliders are provided to be slidably connected to the guide rails. The two driven ends of the screw variable pitch assembly are respectively connected to the sliders through a variable pitch groove, and an adaptive tightening mechanism is installed on each of the two sliders. The screw variable pitch assembly is driven by a servo motor. That is, by driving the screw variable pitch assembly to rotate by the servo motor, the sliders can be linked to move towards or away from each other on the guide rails, so as to vary the pitch of the two adaptive tightening mechanisms and match different screw pitches. The adaptive tightening mechanism is provided with a spring floating assembly. The tightening gun is connected to the sleeve through the spring floating assembly and an extension rod. When tightening the screw through the sleeve, the spring floating assembly is pre-pressed first to cover the height change in the tightening direction after the screw is tightened in place, ensuring the stability and reliability of the tightening process. That is, by the two adaptive tightening mechanisms, two screws can be tightened simultaneously, and screws with a height difference can be accommodated, ultimately greatly improving the quality and efficiency of screw tightening.

[0082] 2. By providing a distance measuring sensor, the pre-pressing value of the spring floating assembly can be measured to avoid applying excessive pressure during the pre-pressing process, further ensuring the quality of screw tightening.

[0083] Although the specific embodiments of the present invention have been described above, those skilled in the art of this technology should understand that the specific embodiments we described are illustrative rather than used to limit the scope of the present invention. Equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present invention should be covered by the scope protected by the claims of the present invention.

Claims

1. A biaxial adaptive screw tightening device, characterized in that: Comprising: A carrier plate, on which two variable pitch grooves are horizontally arranged in parallel; A pair of guide rails, which are arranged in parallel on the front of the carrier plate and are respectively located above and below the variable pitch grooves; Two sliders, both of which are slidably connected to the pair of guide rails; Two adaptive tightening mechanisms, which are respectively vertically installed on the front of one of the sliders; A screw rod variable pitch assembly, which is horizontally arranged on the back of the carrier plate, and two driven ends are respectively connected to the sliders through one of the variable pitch grooves; A servo motor, which is arranged on the back of the carrier plate, and the power output end is connected to the transmission end of the screw rod variable pitch assembly; A mounting bracket, which is arranged on the back of the carrier plate; A flange plate, which is vertically installed at the top of the mounting bracket; A plurality of limiting members, which are arranged on the front of the carrier plate and are located in the middle and at the ends of the guide rails, and are used for limiting the moving stroke of the sliders; Two cameras, which are respectively arranged at the bottom of one of the sliders and the shooting directions are downward; Two ranging sensors, which are respectively arranged on one of the sliders and the measuring directions are downward.

2. The dual-axis adaptive screw tightening device according to claim 1, characterized in that: The adaptive tightening mechanism includes: A vertical plate, which is installed on the front of the slider; A pair of slide rails, which are vertically arranged on the front of the vertical plate; A spring floating assembly, which is slidably connected to the pair of slide rails; A cylinder, which is arranged on the vertical plate, and the power output end is connected to the spring floating assembly; A tightening gun, which is vertically installed on the spring floating assembly; An extension rod, which is connected to the power output end of the tightening gun; A sleeve, which is installed at the end of the extension rod.

3. A dual-axis adaptive screw tightening device as described in claim 1, characterized in that: It further includes: A PLC, which is respectively connected to the adaptive tightening mechanism, the servo motor, the camera and the ranging sensor.

4. The dual-axis adaptive screw tightening device according to claim 3, characterized in that: It further includes: A communication module, which is connected to the PLC.

5. The dual-axis adaptive screw tightening device according to claim 4, characterized in that: The communication module is at least one of a 2G communication module, a 3G communication module, a 4G communication module, a 5G communication module, an NB-IOT communication module, a LORA communication module, a WIFI communication module, a Bluetooth communication module, a ZigBee communication module or a wired communication module.

6. The dual-axis adaptive screw tightening device according to claim 3, characterized in that: It further includes: A display screen, which is connected to the PLC.

7. The dual-axis adaptive screw tightening device according to claim 6, characterized in that: The display screen is a touch display screen.

8. The dual-axis adaptive screw tightening device according to claim 3, wherein: It further includes: A power module, which is connected to the PLC.

Images