A grease injection device for a lead screw structure

Abstract

The present invention provides a grease injection device for a lead screw structure, which can provide a hardware basis for realizing the grease injection process of the lead screw structure on the fully automated production line of new energy vehicles. It fixes the lead screw at the top of the lower positioning shaft through the positioning jaws in the rod head positioning hole of the lead screw structure, and moves the lead screw structure arranged on the positioning jaws from the feeding station to the grease injection station through the feeding structure; the clamping cylinder in the nut fixing structure pushes the nut clamping block to fix the position of the nut from both sides; the output end of the upper positioning cylinder in the upper fixing structure moves downward, so that the upper positioning shaft slowly moves downward along the guide sleeve for the positioning shaft and the adjustment plate for the upper positioning shaft until the positioning thimble at the bottom of the upper positioning shaft is inserted into the rod bottom positioning hole of the lead screw structure; the grease injection needle is inserted into the thread raceway through the grease injection structure.

Description

Technical Field

[0001] The present invention relates to the technical field of screw rod manufacturing, and specifically relates to a grease injection device for a screw rod structure. Background Art

[0002] As Figure 1 and Figure 2 shown, a screw rod structure A for a new energy vehicle includes: a screw rod A1 with a T-shaped cross-section, a nut A2 sleeved on the screw rod A1, and rod head positioning holes A3 and rod bottom positioning holes A4 respectively opened at both ends of the cylindrical rod body of the screw rod A1. In the process of assembling a new energy vehicle, in the process for the screw rod structure A, it is necessary to first install the nut A2 on the screw rod A1, and then inject lubricating grease into the thread raceway A5 between the screw rod A1 and the nut A2. In the prior art, there are also devices for injecting grease into the screw rod. However, since the grease injection process for the screw rod in the prior art is an independent process, the fixing method of the screw rod structure A in the grease injection process, the rotation of the screw rod and the nut during the grease injection process, etc. mostly need to be manually operated by technicians, and it cannot be directly applied to the application scenario of the fully automated production line of new energy vehicles. Summary of the Invention

[0003] In order to solve the problem that the existing grease injection device for the screw rod structure is not applicable to the fully automated production line, the present invention provides a grease injection device for the screw rod structure, which can provide a hardware basis for realizing the grease injection process of the screw rod structure on the fully automated production line of new energy vehicles.

[0004] The technical solution of the present invention is as follows: A grease injection device for a screw rod structure, which includes: a feeding structure, a fixing structure, and a grease injection structure fixed on a bracket, and is characterized in that:

[0005] The fixing structure includes: a nut fixing structure, an upper fixing structure, and a lower fixing structure; the feeding structure includes: a feeding cylinder, a feeding slide rail, and a feeding slider. The feeding slide rail is arranged below the loading station and the grease injection station; the feeding slider is slidably connected to the feeding slide rail, and the output end of the horizontally arranged feeding cylinder is connected to the feeding slider; the lower fixing structure is arranged on the feeding slider and moves between the loading station and the grease injection station under the drive of the feeding cylinder;

[0006] The grease injection structure includes a grease injection needle arranged on the side of the grease injection station;

[0007] The nut fixing structure is arranged on both sides of the grease injection station and includes: symmetrically arranged clamping cylinders and nut clamping blocks arranged at the output ends of the clamping cylinders;

[0008] The upper fixing structure includes: an upper positioning shaft, a guiding sleeve for the upper positioning shaft, an adjusting plate for the upper positioning shaft, and an upper positioning cylinder; the output end of the upper positioning cylinder is arranged downward and is fixed above the greasing station through an upper positioning bracket.

[0009] The upper positioning shaft is a stepped cylindrical shaft in a convex shape; the guiding sleeve for the upper positioning shaft is fixedly connected to the upper positioning bracket, and it includes a sleeve arranged in the vertical direction, and the inner diameter of the sleeve is larger than the diameter of the wider end of the upper positioning shaft.

[0010] The adjusting plate for the upper positioning shaft is connected to the output end of the upper positioning cylinder. A circular through-hole is opened on the adjusting plate for the upper positioning shaft. The diameter of the through-hole is smaller than the diameter of the wider end of the upper positioning shaft and larger than the diameter of the narrower end of the upper positioning shaft; the circular through-hole of the adjusting plate for the upper positioning shaft is coaxially arranged below the guiding sleeve for the upper positioning shaft.

[0011] The narrower end of the upper positioning shaft vertically downward aligns with the axial center position of the lead screw A1 on the greasing station and is movably sleeved in the through-hole of the adjusting plate for the upper positioning shaft; the wider end is movably sleeved in the guiding sleeve for the upper positioning shaft.

[0012] A positioning thimble is arranged at the narrower end of the upper positioning shaft, and the diameter of the positioning thimble is smaller than the diameter of the rod bottom positioning hole A4 on the lead screw A1.

[0013] The fixing structure includes: a lower positioning shaft, a rotating servo motor, and a lower positioning servo motor.

[0014] The lower positioning shaft is vertically arranged, and a positioning jaw is arranged at the top end. The diameter of the combined positioning jaws is smaller than the rod head positioning hole A3 on the lead screw A1; the bottom end of the lower positioning shaft is connected to the output end of the rotating servo motor.

[0015] The output end of the lower positioning servo motor is connected to the bottom end of a vertically upward arranged transmission ball screw. A lower positioning nut structure is sleeved on the transmission ball screw; the rotating servo motor is fixedly connected to the lower positioning nut structure.

[0016] The lower positioning servo motor and the transmission ball screw are fixed on a lower positioning frame, and the lower positioning frame is fixedly connected to the feeding slider.

[0017] Its further feature is that:

[0018] It further includes a positioning structure. The positioning structure includes: laser sensors symmetrically arranged on both sides of the greasing station; the two laser sensors respectively align with the top end and the bottom end thread raceway A5 positions of the nut A2 on the greasing station.

[0019] The grease injection structure includes two grease injection needles, which are fixed on the bracket, and the needle tip positions of the two grease injection needles are respectively located at the top and bottom height positions of the lead nut A2 at the grease injection station;

[0020] The grease injection structure further includes: a grease metering valve and a needle moving cylinder; each grease injection needle is configured with a grease metering valve, and the grease metering valve is connected to a grease barrel through a fat extraction pump; the needle moving cylinder is arranged on the side of the grease injection station, and the output end is connected to the grease injection needle;

[0021] The lead nut clamping block includes: an arc-shaped clamping surface, and the other two lead nut clamping blocks are symmetrically arranged, and the radian of the arc-shaped clamping surface is adapted to the outer circumferential surface of the lead nut A2.

[0022] A grease injection device for a lead screw structure provided by the present application fixes the lead screw A1 at the top of the lower positioning shaft through a positioning jaw in the rod head positioning hole A3 in the lead screw structure A, and moves the lead screw structure A arranged on the positioning jaw from the loading station to the grease injection station through a feeding structure; after reaching the grease injection station, the clamping cylinder in the lead nut fixing structure pushes the lead nut clamping blocks to fix the position of the lead nut A2 from both sides; the output end of the upper positioning cylinder in the upper fixing structure moves downward, so that the upper positioning shaft slowly moves downward along the guiding sleeve for the positioning shaft and the adjusting plate for the upper positioning shaft until the positioning thimble at the bottom end of the upper positioning shaft is inserted into the rod bottom positioning hole A4 of the lead screw structure A; the grease injection needle is inserted into the thread raceway A5 through the grease injection structure; after the grease injection structure is started, the lead screw A1 is driven to rotate by a servo motor for rotation, and the driving ball screw is driven to rotate by a lower positioning servo motor, and then the lead screw A1 is driven to move upward or downward along with its own rotation through the lower positioning lead nut structure, so as to ensure that relative movement occurs between the lead screw A and the lead nut A2 while lubricating grease is injected into the thread raceway A5, thereby ensuring that the grease can be evenly smeared in the thread raceway A5; based on the technical solution of the present application, the process of injecting grease into the lead screw structure A can be completed, providing a hardware basis for realizing the lead screw structure grease injection process on the fully automated production line of new energy vehicles. Description of the Drawings

[0023] Figure 1 It is a three-dimensional structural schematic diagram of the lead screw structure;

[0024] Figure 2 It is a sectional structural schematic diagram of the lead screw and the lead nut in the lead screw structure;

[0025] Figure 3 It is a three-dimensional structural schematic diagram of the lead screw structure grease injection device in the present application;

[0026] Figure 4 It is a front view structural schematic diagram of the lead screw grease injection structure in the present application;

[0027] Figure 5 is Figure 4 A schematic structural view of the C-C direction cross-section in

[0028] Figure 6 is Figure 5 An enlarged structural view at position B in

[0029] Figure 7 is Figure 3 An enlarged structural view at position D in

[0030] Figure 8 A schematic top view structural view;

[0031] Figure 9 A schematic structural view of the grease injection barrel. Specific implementation manner

[0032] As Figures 3 to 9 shown, the present application includes a grease injection device for a lead screw structure, which includes: a feeding structure 3 fixed on a bracket 1, a fixing structure, a grease injection structure 5, and a positioning structure 6. The fixing structure includes: a nut fixing structure 7, an upper fixing structure 4, and a lower fixing structure 2.

[0033] The bracket 1 includes: a support frame 1-9 and a grease injection support plate 1-6 fixed on the support frame 1-9. A grease injection station 1-2 is opened below the grease injection support plate 1-6, and a feeding station 1-1 and the grease injection station 1-2 are set at the same horizontal height; a feeding connecting plate 1-3 is arranged below the grease injection support plate 1-6 and is connected to the grease injection support plate 1-6 through a support column 8; a horizontal track plate 1-8 is fixedly connected to the feeding connecting plate 1-3, and the track plate 1-8 is arranged below the feeding station 1-1 and the grease injection station 1-2 to connect the two stations.

[0034] The feeding structure 3 includes: a feeding cylinder 3-1, a feeding slide rail 3-2, and a feeding slider 3-3. The feeding slide rail 3-2 is installed on the track plate 1-8 and is arranged below the feeding station 1-1 and the grease injection station 1-2; the feeding slider 3-3 is slidably connected to the feeding slide rail 3-2, and the output end of the horizontally arranged feeding cylinder 3-1 is connected to the feeding slider 3-3; the lower fixing structure 2 is arranged on the feeding slider 3-3 and moves between the feeding station 1-1 and the grease injection station 1-2 under the drive of the feeding cylinder 3-1. In the Figure 3 , Figure 5 and Figure 8 figures, the body of the feeding cylinder is omitted, and only the output end of the feeding cylinder is retained.

[0035] As Figures 4 to 6As shown in the figure, the lower fixing structure 2 includes: a lower positioning servo motor 2-1, a lower positioning shaft 2-5, and a rotating servo motor 2-3; the lower positioning shaft 2-5 is vertically arranged, and a positioning jaw 2-6 is arranged at the top end. The diameter of the positioning jaws 2-6 after merging is smaller than the rod head positioning hole A3 on the lead screw A1; the positioning jaws 2-6 are in a merged state when in the non-loading state, and the positioning jaws 2-6 are driven by a jaw cylinder 2-7 to realize the actions of merging or opening.

[0036] The bottom end of the lower positioning shaft 2-5 is connected to the output end of the rotating servo motor 2-3; the output end of the lower positioning servo motor 2-1 is connected to the bottom end of a transmission ball screw 2-2 arranged vertically upward, and a lower positioning nut structure 2-4 is sleeved on the transmission ball screw 2-2; the rotating servo motor 2-3 is fixedly connected to the lower positioning nut structure 2-4. The lower positioning servo motor 2-1 and the transmission ball screw 2-2 are fixed on a lower positioning frame 1-7, and the lower positioning bracket 1-7 is fixed on the feeding slider 3-3.

[0037] During specific implementation, the initial position of the feeding slider 3-3 is at the loading station. Through the loading equipment (not marked in the figure) in the production line, such as a four-axis robot and other equipment, the lead screw structure A to be greased is placed on the top end of the lower positioning shaft 2-5 in the form of the rod head positioning hole A3 on the lead screw A1 facing downwards, and the rod head positioning hole A3 is sleeved on the two positioning jaws 2-6. The jaw cylinder 2-7 drives the two positioning jaws 2-6 to open and tightly hold the lead screw A1 from the inside, so as to fix the lead screw structure A at the top end of the lower positioning shaft 2-5. The feeding cylinder 3-1 is started, and the feeding slider 3-3 is pushed along the feeding slide rail 3-2 to send the lead screw structure A arranged at the top end of the lower positioning shaft 2-5 to the greasing station 1-2.

[0038] Such as Figure 7 and Figure 8 As shown in the figure, the nut fixing structure 7 is arranged on both sides of the greasing station 1-2, and includes: a clamping cylinder symmetrically arranged with the lead screw A1 on the greasing station 1-2 as the axis and a nut clamping block arranged at the output end of the clamping cylinder: a left clamping block 7-3 and a right clamping block 7-4; the clamping cylinder includes: a left nut clamping cylinder 7-1 and a right nut clamping cylinder 7-2; the nut clamping block includes: an arc-shaped clamping surface. The two nut clamping blocks are symmetrically arranged to form a () shape, and the radian of the arc-shaped clamping surface is adapted to the outer circumferential surface of the nut A2 to ensure that the nut A2 can be firmly and stably fixed.

[0039] The nut clamping left cylinder 7-1 and the nut clamping right cylinder 7-2 clamp the left clamping block 7-3 and the right clamping block 7-4 and push them towards the central position until the nut A2 is clamped and then stop. In the technical solution of this application, during the grease injection process, the position of the nut A2 is fixed, and the relative movement between the nut A2 and the lead screw A1 is realized by the rotation of the lead screw A1, so as to realize evenly applying the lubricating grease to the thread raceway A5 through the nut A2.

[0040] While the nut A2 is fixed, the upper fixing structure 4 also needs to position the lead screw A1 from above.

[0041] As Figures 4 to 6 shown, the upper fixing structure 4 includes: an upper positioning cylinder 4-1, an upper positioning shaft 4-2, a guide sleeve 4-3 for the upper positioning shaft, and an adjusting plate 4-4 for the upper positioning shaft; the output end of the upper positioning cylinder 4-1 is vertically downward and is fixed above the grease injection station 1-2 through the upper positioning bracket 1-4; the upper positioning bracket 1-4 is fixed above the grease injection support plate 1-6 through a support column.

[0042] The upper positioning shaft 4-2 is a convex-shaped stepped cylindrical shaft; the guide sleeve 4-3 for the upper positioning shaft is fixedly connected to the upper positioning bracket 1-4 and includes a sleeve arranged in the vertical direction, and the inner diameter of the sleeve is larger than the diameter of the wider end of the upper positioning shaft 4-2; the adjusting plate 4-4 for the upper positioning shaft is connected to the output end of the upper positioning cylinder 4-1, and a circular through hole is opened on the adjusting plate 4-4 for the upper positioning shaft. The diameter of the through hole is smaller than the diameter of the wider end of the upper positioning shaft 4-2 and larger than the diameter of the narrower end of the upper positioning shaft 4-2; the circular through hole of the adjusting plate 4-4 for the upper positioning shaft is coaxially arranged below the sleeve of the guide sleeve 4-3 for the upper positioning shaft; the narrower end of the upper positioning shaft 4-2 is vertically downward and aligned with the axis position of the lead screw A1 on the grease injection station 1-2, and is movably sleeved in the through hole of the adjusting plate 4-4 for the upper positioning shaft; the wider end is movably sleeved in the guide sleeve 4-3 for the upper positioning shaft. During specific installation, a guide post 1-5 is arranged on the upper end surface of the adjusting plate 4-4 for the upper positioning shaft, and a through hole is arranged at the position corresponding to the guide post 1-5 on the upper positioning bracket 1-4. The guide post 1-5 movably passes through the through hole on the upper positioning bracket 1-4. When the upper positioning cylinder 4-1 drives the adjusting plate 4-4 for the upper positioning shaft to move up and down, the guide post 1-5 slides along the through hole on the upper positioning bracket 1-4 to ensure that the movement of the adjusting plate 4-4 for the upper positioning shaft is more stable.

[0043] A positioning thimble 4-5 is arranged at the narrower end of the upper positioning shaft 4-2. The diameter of the positioning thimble 4-5 is smaller than the diameter of the rod bottom positioning hole A4 on the lead screw A1. The positioning thimble 4-5 is inserted into the rod bottom positioning hole A4 to ensure that the upper positioning shaft 4-2 can be more stably arranged on the lead screw A1, and further ensure that the connection between the two is more stable during the rotary grease injection process and the lead screw A2 is more concentric when rotating.

[0044] In order to ensure that the lead screw structure A can be smoothly sent to the grease injection station 1-2, the default position of the upper positioning shaft 4-2 is away from the grease injection station 1-2. That is, the vertically downward output end of the upper positioning cylinder 4-1 is in the retracted state by default. The upper positioning shaft 4-2 is movably inserted into the upper positioning shaft guiding sleeve 4-3 and the upper positioning shaft adjusting plate 4-4 from top to bottom. When the output end of the upper positioning cylinder 4-1 moves upward to lift the upper positioning shaft adjusting plate 4-4, during the upward movement of the upper positioning shaft adjusting plate 4-4, it gets stuck at the step of the upper positioning shaft 4-2 and lifts the upper positioning shaft 4-2 away from the grease injection station 1-2.

[0045] After the lead screw structure A is sent to the grease injection station 1-2, the upper positioning cylinder 4-1 is activated, and the output end drives the upper positioning shaft adjusting plate 4-4 to move downward. The upper positioning shaft 4-2 moves downward accordingly until the positioning thimble 4-5 at the lowermost end of the upper positioning shaft 4-2 is inserted into the rod bottom positioning hole A4 on the lead screw A1. After the upper positioning shaft 4-2 stops moving, the upper positioning shaft 4-2 positions the lead screw structure A from above, ensuring that the lead screw A1 can rotate stably during the grease injection process. In this embodiment, the initial movement direction of the lead screw A1 is downward. Therefore, when the upper positioning shaft 4-2 stops moving, the upper positioning cylinder 4-1 continues to move downward to ensure that the distance between the upper positioning shaft adjusting plate 4-4 and the step of the upper positioning shaft 4-2 is greater than the maximum downward movement distance of the lead screw A1, thereby ensuring that the upper positioning shaft 4-2 can stably move up and down with the lead screw A1 based on its own gravity during the grease injection process.

[0046] As Figure 7 shown, the positioning structure 6 includes: two opposed laser sensors symmetrically arranged on both sides of the grease injection station 1-2: a first positioning laser sensor 6-1 and a second positioning laser sensor 6-2; the two laser sensors are respectively aligned with the top of the nut A2 position and the position of the thread raceway A5 at the bottom on the grease injection station 1-2.

[0047] Since it is necessary to inject lubricating grease into the thread raceway A5 to ensure that the grease injection needle can be placed in the thread raceway A5. However, the position of the lead screw A1 is uncontrollable during feeding. In this application, the opposed laser sensors are used to find the position of the thread raceway A5 on the lead screw A1. In order to ensure that sufficient lubricating grease can be injected and the lubricating grease can be quickly and evenly applied to the lead screw A1, in this application, a thread raceway A5 needs to be found above and below the nut A2 respectively. And in order to ensure that the lead screw structure A can be smoothly sent to the grease injection station 1-2, the default position of the grease injection needle is away from the grease injection station 1-2. As shown, before the grease injection starts, it is necessary to find the thread raceway A5 at both the upper and lower ends of the nut A2 as the injection points for the upper grease injection needle 5-1 and the lower grease injection needle 5-2.

[0048] The positioning process of the injection point is as follows: When the lead screw structure A is fixed by the upper fixing structure 4, the lower fixing structure 2, and the nut fixing structure 7 at the same time, the lower positioning servo motor 2-1 and the rotating servo motor 2-3 are started simultaneously. The rotating servo motor 2-3 drives the rotation of the lead screw A1 through the lower positioning shaft 2-5. Since the nut A2 is fixed in position, the lead screw A1 will move upward or downward. In this embodiment, the nut A2 is default placed at the bottom end of the lead screw A1, so the initial rotation direction of the rotating servo motor 2-3 is set to the rotation direction that moves the lead screw A1 downward. At the same time, the initial starting direction of the lower positioning servo motor 2-1 is downward movement, and its speed is set to be the same as the movement speed of the lead screw A1.

[0049] When the lead screw A1 rotates, the first positioning laser sensor 6-1 and the second positioning laser sensor 6-2 simultaneously detect the lead screw A1 at the upper and lower ends of the nut A2. When the thread raceway A5 is detected at both the upper and lower ends of the nut A2, the lower positioning servo motor 2-1 and the rotating servo motor 2-3 stop simultaneously.

[0050] As Figure 4 , 7 , as shown in Figure 8, the grease injection structure 5 includes a grease injection needle arranged on the side of the grease injection station 1-2; the grease injection structure 5 includes two grease injection needles: the upper grease injection needle 5-1 and the lower grease injection needle 5-2; the two grease injection needles are fixed on the grease injection support plate 1-6, and the needle tips of the two grease injection needles are respectively located at the top and bottom height positions of the nut A2 at the grease injection station 1-2; the needle movement cylinders are arranged on the side of the grease injection station 1-2, namely: the upper grease needle movement cylinder 5-4 and the lower grease needle movement cylinder 5-3, and the output ends of the needle movement cylinders are respectively connected to a grease injection needle. When the injection point is found, the upper grease needle movement cylinder 5-4 and the lower grease needle movement cylinder 5-3 are started, and the upper grease injection needle 5-1 and the lower grease injection needle 5-2 are respectively pushed to the thread raceway A5 at the top and bottom of the nut A2. In the technical solution of this application, each grease injection needle is equipped with a grease metering valve, namely the upper grease metering valve 5-8 and the lower grease metering valve 5-7, and the grease metering valves are respectively connected to the grease bucket 5-5 through the fat extraction pump 5-6; ensuring that the lubricating grease can be accurately injected into the lead screw structure A according to the preset weight. The embodiment of the fat extraction pump 5-6 connected to the grease bucket 5-5 is specifically as Figure 9 shown.

[0051] After the upper grease injection needle 5-1 and the lower grease injection needle 5-2 are pushed to the top and bottom thread raceways A5 of the lead nut A2 position, the lower positioning servo motor 2-1 and the rotating servo motor 2-3 are started again at the same time. The lead screw A1 rotates again while moving downward; during the rotation of the lead screw A1, the fat extraction pump 5-6 pumps out the lubricating grease from the grease bucket 5-5, controls a certain amount of grease through the upper grease metering valve 5-8 and the lower grease metering valve 5-7, and then sends it into the upper grease injection needle 5-1 and the lower grease injection needle 5-2, and then into the thread raceway A5. The lubricating grease is evenly applied to the thread raceway A5 of the lead screw A1 through the lead nut A2. When the lead screw A1 moves downward to the lowest position, the lower positioning servo motor 2-1 and the rotating servo motor 2-3 stop at the same time and then start in reverse; the lead screw A1 rotates in reverse and moves upward at the same time, and the lead nut A2 evenly applies the lubricating grease again in the opposite direction to ensure that the lubricating grease can be evenly applied. Since the upper positioning shaft 4-2 is movably inserted into the upper positioning shaft guide sleeve 4-3 and the upper positioning shaft adjusting plate 4-4, during the grease injection process, when the lead screw A1 moves upward or downward, the upper positioning shaft 4-2 moves upward or downward with the lead screw A1 based on the lifting force of the lead screw A1 or its own gravity, ensuring that the lead screw A1 can rotate more stably, and thus ensuring that the application of the lubricating grease is more uniform. Among them, the upper grease injection needle 5-1 and the lower grease injection needle 5-2 can be realized based on the grease injection needles, grease injection heads and other structures in the prior art grease injection structure.

[0052] When the grease injection needles 5-1 and the lower grease injection needle 5-2 inject the lubricating grease into the lead screw structure A according to the preset amount, and the lead screw A1 rotates and applies the lubricating grease according to the preset direction and number of times, the lower positioning servo motor 2-1 and the rotating servo motor 2-3 stop at the same time; the upper positioning cylinder 4-1 starts in reverse, driving the upper positioning shaft adjusting plate 4-4 to move upward. During the movement, when the upper positioning shaft adjusting plate 4-4 rises to the step of the upper positioning shaft 4-2, the upper positioning shaft 4-2 is lifted away from the grease injection station 1-2 until the upper positioning shaft 4-2 returns to the initial position, the upper positioning cylinder 4-1 stops, and at the same time the lead nut clamping left cylinder 7-1 and the lead nut clamping right cylinder 7-2 move in reverse to release the clamping of the lead nut A2; the upper grease needle moving cylinder 5-4 and the lower grease needle moving cylinder 5-3 start in reverse to move the two grease injection needles back to the default position away from the grease injection station 1-2; the feeding cylinder 3-1 starts in reverse, driving the feeding slider 3-3 to move along the feeding slide rail 3-2 to the feeding station 1-1 to complete the entire grease injection process.

[0053] Based on the upper fixing structure 4, lower fixing structure 2 and nut fixing structure 7 in the present application, the fixing of the lead screw structure A can be achieved without manual operation of the lead screw structure A by humans. Then, in cooperation with the lower positioning servo motor 2-1 and the rotating servo motor 2-3, the stable rotation of the lead screw structure A can be realized. Specifically, in implementation, based on the PLC control technology in the prior art, in cooperation with the detection result of the laser sensor in the positioning structure 6 and the control of the grease metering valve by the grease injection structure 5, the automatic operation of the grease injection operation for the lead screw structure can be realized based on the hardware structure of the present application. That is, based on the technical solution of the present application, the process of injecting grease into the lead screw structure A can be completed, and at the same time, a hardware basis can be provided for realizing the grease injection process of the lead screw structure on the fully automated production line of new energy vehicles.

Claims

1. A grease injection device for a lead screw structure, which comprises: a feeding structure, a fixing structure and a grease injection structure fixed on a bracket, and is characterized in that: the fixing structure includes: a nut fixing structure, an upper fixing structure and a lower fixing structure; the feeding structure includes: a feeding cylinder, a feeding slide rail and a feeding slider, and the feeding slide rail is arranged below the feeding station and the grease injection station; the feeding slider is slidably connected to the feeding slide rail, and the output end of the horizontally arranged feeding cylinder is connected to the feeding slider; the lower fixing structure is arranged on the feeding slider and moves between the feeding station and the grease injection station under the drive of the feeding cylinder; the grease injection structure includes a grease injection needle arranged on the side of the grease injection station; the nut fixing structure is arranged on both sides of the grease injection station and includes: symmetrically arranged clamping cylinders and nut clamping blocks arranged at the output ends of the clamping cylinders; the upper fixing structure includes: an upper positioning shaft, a guiding sleeve for the upper positioning shaft, an adjusting plate for the upper positioning shaft and an upper positioning cylinder; the output end of the upper positioning cylinder is arranged downward and is fixed above the grease injection station through an upper positioning bracket; the upper positioning shaft is a stepped cylindrical shaft in a convex shape; the guiding sleeve for the upper positioning shaft is fixedly connected to the upper positioning bracket and includes a sleeve arranged in the vertical direction, and the inner diameter of the sleeve is larger than the diameter of the wider end of the upper positioning shaft; the adjusting plate for the upper positioning shaft is connected to the output end of the upper positioning cylinder, and a circular through hole is opened on the adjusting plate for the upper positioning shaft, and the diameter of the through hole is smaller than the diameter of the wider end of the upper positioning shaft and larger than the diameter of the narrower end of the upper positioning shaft; the circular through hole of the adjusting plate for the upper positioning shaft and the guiding sleeve for the upper positioning shaft are coaxially arranged below the sleeve; the narrower end of the upper positioning shaft vertically downward aligns with the axis position of the lead screw on the grease injection station and is movably sleeved in the through hole of the adjusting plate for the upper positioning shaft; the wider end is movably sleeved in the guiding sleeve for the upper positioning shaft; a positioning thimble is arranged at the narrower end of the upper positioning shaft, and the diameter of the positioning thimble is smaller than the diameter of the rod bottom positioning hole on the lead screw; the fixing structure includes: a lower positioning shaft, a rotating servo motor and a lower positioning servo motor; the lower positioning shaft is vertically arranged, and a positioning claw is arranged at the top end, and the diameter of the combined positioning claws is smaller than the rod head positioning hole on the lead screw; the bottom end of the lower positioning shaft is connected to the output end of the rotating servo motor; the output end of the lower positioning servo motor is connected to the bottom end of a vertically upward arranged driving ball screw, and a lower positioning nut structure is sleeved on the driving ball screw; the rotating servo motor is fixedly connected to the lower positioning nut structure; the lower positioning servo motor and the driving ball screw are fixed on a lower positioning frame, and the lower positioning frame is fixedly connected to the feeding slider.

2. The grease injection device for a lead screw structure according to claim 1, characterized in that: it further includes a positioning structure, and the positioning structure includes: laser sensors symmetrically arranged on both sides of the grease injection station; the two laser sensors respectively align with the positions of the top and bottom thread raceways of the nut on the grease injection station.

3. The grease injection device for a lead screw structure according to claim 1, characterized in that: the grease injection structure includes two grease injection needles, the grease injection needles are fixed on the bracket, and the needle tip positions of the two grease injection needles are respectively located at the height positions of the top and bottom of the nut position at the grease injection station.

4. The grease injection device for a lead screw structure according to claim 3, characterized in that: the grease injection structure further includes: a grease metering valve and a needle moving cylinder; each grease injection needle is configured with one grease metering valve, the grease metering valve is connected to a grease barrel through a fat extraction pump; the needle moving cylinder is arranged on the side of the grease injection station, and the output end is connected to the grease injection needle.

5. The grease injection device for a lead screw structure according to claim 1, characterized in that: the nut clamping block includes: an arc-shaped clamping surface, the other nut clamping blocks are symmetrically arranged, and the radian of the arc-shaped clamping surface is adapted to the outer circumferential surface of the nut.

Images