A chair back mounting screw machine

Abstract

The present invention relates to the field of chair manufacturing and processing, in particular to a screw machine for installing chair backs, which includes a screw feeding mechanism, a chair back clamping and fixing mechanism, and a manipulator assembly. The chair back clamping and fixing mechanism is located adjacent to the end of the discharging track. The manipulator grabs the screws located in the screw feeding mechanism, places them on the chair back mounting posts located in the chair back clamping and fixing mechanism, and screws the screws into the chair back mounting posts; realizing a complete installation pipeline system from screw grabbing, chair back fixing, screw handling to screwing the screws into the chair back mounting posts, improving the overall work efficiency and saving time and effort.

Description

Technical Field

[0001] The present invention relates to the field of chair manufacturing and processing, and particularly to a screw machine for installing a chair backrest. Background Art

[0002] As Figure 1 and Figure 2 shown, Figure 1 the chair backrest in Figure 2 is an existing structure, and the structure of the chair backrest board in Summary of the Invention

[0003] The purpose of the present invention is to provide a screw machine for installing a chair backrest, which can realize a flow-type manufacturing process of screw grasping, handling and screwing, thereby improving the working efficiency of screwing the screw into the chair backrest.

[0004] To achieve the above object, the main technical solution of the present invention is a screw machine for installing a chair backrest, including:

[0005] Screw feeding mechanism, including a vibrating bowl and a discharge track connected to the discharge end of the vibrating bowl. The track surface of the discharge track forms a delivery channel through which the screw shaft of the screw can pass and the gasket on the screw is restricted from passing through. At least one section of the delivery channel is provided with a warning device. The warning device includes a sensing part, a switch part and an alarm part. The sensing part is located above the delivery channel, and the sensing end of the sensing part faces the delivery channel to detect the screw moving on the delivery channel. The switch part is located below the delivery channel and is opposite to the sensing end. The alarm part is triggered to start or close based on the signal received by the switch part. Within a preset time range, the switch part continuously receives the signal transmitted by the sensing part to trigger the start of the alarm part.

[0006] Backrest clamping and fixing mechanism, including a backrest positioning table and clamping components respectively arranged at the top, bottom and both sides of the backrest positioning table. The backrest positioning table is used to position and install the backrest to be screwed with screws. The clamping component includes a driving part and a pressing part connected to the driving part. The backrest is clamped and positioned on the backrest positioning table by rotating or telescoping the pressing part through the driving part. The backrest clamping and fixing mechanism is located at an adjacent position to the end of the discharge track.

[0007] And a manipulator assembly, including an installation frame and a manipulator arranged on the installation frame. A lifting arm is slidably arranged on the installation frame. The manipulator is arranged at the bottom of the lifting arm. The manipulator is driven to move back and forth between the screw feeding mechanism and the backrest clamping and fixing mechanism through the back-and-forth movement and up-and-down lifting of the lifting arm. The manipulator grabs the screw located in the screw feeding mechanism, places it on the backrest mounting post located in the backrest clamping and fixing mechanism, and screws the screw into the backrest mounting post.

[0008] In some examples, the installation frame includes a machine table and a fixing frame arranged above the machine table. A transverse guide rail is laid on the cross beam of the fixing frame. The lifting arm is slidably arranged on the transverse guide rail. The transverse sliding direction of the lifting arm is consistent with the displacement direction of the screw on the discharge track. A longitudinal guide rail is laid on the machine table. A slider is arranged at the bottom of the backrest positioning table. The slider is arranged on the longitudinal guide rail.

[0009] In some examples, a waiting component is provided at the end of the discharge track. The waiting component includes a fixed seat, a turntable and a servo motor. The turntable is movably embedded in the fixed seat, and the surface of the turntable is flush with the surface of the fixed seat. The output shaft of the servo motor is connected to the center of the turntable and drives the turntable to rotate circumferentially relative to the fixed seat. A plurality of waiting stations are evenly distributed on the circumferential edge from the center of the turntable to the required radius distance. The waiting stations are used to receive the screws delivered by the discharge track and rotate the screws to the designated discharge position.

[0010] In some instances, four material waiting stations are provided on the turntable. The angle formed by an adjacent material waiting station and the center point of the turntable is 45°. The material waiting station is a U-shaped notch. The notch diameter is larger than the radial diameter of the screw shaft and smaller than the diameter of the gasket. Each time the turntable rotates, the notch is rotated to communicate with the channel opening of the delivery channel.

[0011] In some instances, an optical fiber sensor is arranged inside the fixed seat. The optical fiber sensor is located at a specified discharging position. The optical fiber sensor is used to detect whether there is a screw on the material waiting station rotated to the specified discharging position. The optical fiber sensor and the servo motor are both electrically connected to the same controller.

[0012] In some instances, the chair back positioning table includes a plurality of first positioning blocks arranged along the outer contour shape of the chair back. The inner end of the first positioning block is lower than the outer end in height. The surfaces of the first positioning blocks for placing the chair back are all inclined surfaces with a certain arc. A convex block for positioning the chair back is arranged at the outer end of the first positioning block.

[0013] In some instances, a vibration mechanism is arranged at the bottom of the discharging track. The vibration mechanism is used to vibrate the discharging track to drive the screws located on the discharging track. The vibration mechanism and the servo motor are both electrically connected to the same controller. When the servo motor drives the turntable to rotate and rotates one of the material waiting stations to communicate with the channel opening of the delivery channel, the vibration mechanism is started to vibrate the screws at the end of the discharging track onto the material waiting station.

[0014] In some instances, the vibrating disk is provided with a material cylinder. A spirally arranged vibration track is provided on the side wall of the material cylinder. The vibration track includes a first material selection section and a second material selection section. The vibration track in the first material selection section includes a first bottom plate arranged along the conveying direction. The screw head and the gasket face downwards and vibrate and displace on the first bottom plate. The second material selection section is composed of a second bottom plate and side plates arranged on both sides of the second bottom plate. The bottom parts of the side plates on both sides are folded inwards to form flanging. There is a clearance area between the two flangings. The clearance area is the delivery channel. The end of the first material selection section is obliquely connected to the head of the second material selection section through a turning section.

[0015] In some instances, four rows of first positioning blocks are horizontally arranged on the chair back positioning table from top to bottom. Each row is composed of at least two first positioning blocks. The first positioning blocks in the first row are used to position the top of the chair back. The first positioning blocks in the second row are used to position both sides of the chair back at the human shoulders. The first positioning blocks in the third row are used to position both sides of the chair back at the human waist. The first positioning blocks in the fourth row are used to position the bottom of the chair back.

[0016] In some instances, the clamping assembly disposed at the bottom end of the chair back positioning table includes a telescopic cylinder and a pressing plate connected to the output end of the telescopic cylinder. When the telescopic cylinder drives the pressing plate to move inward, the inner side wall of the pressing plate abuts against and positions the bottom of the chair back placed on the chair back positioning table.

[0017] Due to the adoption of the above technical solutions, the present invention achieves the following effects: (1) realizing a complete installation pipeline system for screw grasping, chair back fixing, screw handling, and screwing the screw into the chair back mounting post, improving the overall work efficiency, saving time and effort; (2) avoiding situations such as missing screws in some chair back mounting posts, and improving the yield rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of an embodiment of the present invention,

[0019] Figure 2 is an existing chair back plate structure,

[0020] Figure 3 is Figure 1 a schematic structural diagram of the embodiment from the front view angle,

[0021] Figure 4 is Figure 1 a schematic structural diagram of the screw of the embodiment,

[0022] Figure 5 is Figure 4 a schematic structural diagram of the screw shaft body of the embodiment,

[0023] Figure 6 is Figure 4 a schematic structural diagram of the tool bit fitting groove of the embodiment,

[0024] Figure 7 is Figure 1 a schematic structural diagram of the chair back clamping and fixing mechanism of the embodiment,

[0025] Figure 8 is Figure 1 a schematic structural diagram of the screw feeding mechanism of the embodiment,

[0026] Figure 9 is Figure 8 a schematic structural diagram of the embodiment from the top view angle,

[0027] In the figure: screw feeding mechanism 1, material waiting assembly 11, material waiting station 111, fixed seat 112, turntable 113, vibrating bowl 12, discharge track 13, delivery channel 14, sensing part 15, alarm part 16, switch part 17, vibrating mechanism 18, vibration source 181, positioning plate 182, backrest clamping and fixing mechanism 2, first positioning block 21, second positioning block 22, rotary cylinder 23, pressing plate 24, telescopic cylinder 25, backrest positioning table 26, manipulator assembly 3, lifting arm 31, manipulator 32, fixing frame 33, machine table 34, screw 4, screw head 41, transition section 42, threaded section 43, groove bottom surface 44, external thread 45, fastening gasket 46, tooth 461, bushing 47, tool bit fitting groove 48, backrest A, backrest mounting post A1, chair back plate B, hollow sleeve column B1, groove width D, interval d. Detailed implementation mode

[0028] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles defined in the following description of the present invention can be applied to other implementation schemes, variant schemes, improvement schemes, equivalent schemes, and other technical schemes that do not deviate from the spirit and scope of the present invention.

[0029] Those skilled in the art should understand that in the disclosure of the present invention, the orientation or positional relationship indicated by terms such as "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting the present invention.

[0030] It can be understood that the term "one" should be understood as "at least one" or "one or more". That is, in one embodiment, the number of an element can be one, and in other embodiments, the number of the element can be multiple. The term "one" should not be construed as limiting the quantity.

[0031] Embodiment 1:

[0032] Referring to FIGS. 1 to Figure 9As shown in the figure, a backrest mounting screw machine according to a preferred embodiment of the present invention includes a screw feeding mechanism 1, a backrest clamping and fixing mechanism 2, and a manipulator assembly 3. The backrest clamping and fixing mechanism 2 is located adjacent to the end of the discharge track 13. The manipulator assembly 3 includes a mounting frame and a manipulator 32 disposed on the mounting frame. A lifting arm 31 is slidably disposed on the mounting frame, and the manipulator 32 is disposed at the bottom of the lifting arm 31. The manipulator 32 is driven to move back and forth between the screw feeding mechanism 1 and the backrest clamping and fixing mechanism 2 by the back-and-forth movement and up-and-down lifting of the lifting arm 31. The manipulator 32 grabs the screw 4 located in the screw feeding mechanism 1, places it on the backrest mounting post A1 located in the backrest clamping and fixing mechanism 2, and screws the screw 4 into the backrest mounting post A1. The screw feeding mechanism 1 is used to vibrate each screw 4 to the discharge end in a state where the screw head 41 faces upward, the threaded section 43 and the concave surface of the fastening gasket 46 face downward, waiting for the manipulator 32 to grab. The backrest clamping and fixing mechanism 2 is used to clamp and position the backrest A. The side of the backrest A with the backrest mounting post A1 faces upward and is placed on the backrest clamping and fixing mechanism 2 to prevent the backrest A from shaking during the process of screwing the screw 4, resulting in the screw 4 being skewed or unable to be screwed in. Compared with the traditional manual processes of selecting the screw 4, transporting and supporting the backrest A, and screwing in each screw 4 one by one, this backrest mounting screw machine can effectively simplify the manual operation process, reduce labor, improve work efficiency, and enhance the standardization degree of products.

[0033] Specifically, the screw 4 used in this embodiment includes a screw 4 shaft body and a fastening gasket 46. The screw 4 shaft body successively includes a threaded section 43, a transition section 42, and a screw head 41. An external thread 45 adapted to the internal thread of the chair backrest mounting post A1 is provided on the screw 4 shaft body located on the threaded section 43. The shaft wall of the screw 4 shaft body located on the transition section 42 is smooth. A tool bit fitting groove 48 is provided at the center of the top surface of the screw head 41. The fastening gasket 46 is used for the fastening connection between the chair backrest A and the chair back panel B. The fastening gasket 46 is sleeved on the screw 4 shaft body located on the transition section 42. A plurality of tooth 461 parts are provided along the outer edge of the fastening gasket 46 in the circumferential direction. The fastening gasket 46 is integrally in a planar shape or a curved shape. If the fastening gasket 46 is integrally in a curved shape, its concave surface faces the threaded section 43. The overall structure of the screw 4 is in an umbrella shape. The tool bit fitting groove 48 is formed by equally dividing the circumference of the center part of the screw head 41 of the screw 4 into a cross shape at the required radius distance. The groove width D of each groove extending in the radial direction from the center part of the tool bit fitting groove 48 and the width dimension of the boundary part between adjacent grooves are respectively approximately equally spaced d. Each outer peripheral end wall surface of the tool bit fitting groove 48 is formed substantially perpendicular to the required depth from the opening edge of the tool bit fitting groove 48, and is displaced downward from the vertical groove bottom edge toward the center part of the neck of the screw 4, and its cross center part is formed into a conical groove bottom surface 44. Of course, the groove structure of the tool bit fitting groove 48 can also be set as a straight shape or a flower shape, etc. The purpose of designing the screw 4 into this structure is that through the setting of the fastening gasket 46, the chair back panel B is effectively and firmly fastened to the chair backrest A, and the connection stability between the two is extremely high. It is difficult for the chair back panel B to break away from the chair backrest A after the fastening. Further, the traditional connection method between the chair back panel B and the chair backrest A is to be fastened by bolts. The disadvantage of this connection method is that on the one hand, the operation is relatively cumbersome and the accuracy requirements between the screw holes are relatively high. On the other hand, during the use process, the bolts are prone to looseness, resulting in the chair back panel B breaking away from the chair backrest A. Then some improvements are made. Through a clamping connection method, that is, the chair back panel B is provided with a petal-shaped fastener, and the chair backrest A is provided with a corresponding clamping part. By bending the clamping part inward and deforming it into the fastener, the two are connected. However, this method has a problem that once one of the petals of the petal-shaped fastener is damaged, the connection stability between the two is greatly affected. Therefore, the screw 4 is designed into the above structure. By screwing the screw 4 into the chair backrest mounting post A1 on the chair backrest A, the fastening gasket 46 is clamped and expanded and deformed. A hollow sleeve column B1 corresponding to the mounting post is provided on the chair back panel B. The inner diameter of the hollow sleeve column B1 is slightly larger than the outer diameter of the chair backrest mounting post A1. The hollow sleeve column B1 is sleeved on the chair backrest mounting post A1. Through the staff pressing, each tooth 461 on the outer ring of the fastening gasket 46 abuts against the inner cavity side wall of the hollow sleeve column B1, and then the chair back panel B is firmly connected to the chair backrest A.The advantages of this connection method are: first, it simplifies manual installation and installation process. The process of screwing the screw 4 into the seat back mounting column A1 can be completed by machine. The manual operation only requires pressing the seat back plate B onto the seat back A, which saves time and effort; second, the connection between the two is stable and strong. Even if it is used for a long time, it is not easy for the seat back A and the seat back plate B to separate; third, even if one of the teeth 461 is damaged, it does not affect the stability; fourth, there is no corresponding relationship restriction during installation; wherein, the above-mentioned restriction that the concave surface faces the threaded section 43 is intended to be that if the concave surface faces the screw head 41, it is difficult to buckle on the one hand, and on the other hand, the tooth 461 cannot effectively conflict with the inner cavity wall of the hollow sleeve column B1. ;

[0034] Secondly, in the process of developing the screw 4, a variety of solutions for combining the snap-fit ​​gasket 46 with the transition section 42 were considered, one of which was to process them separately, that is, the snap-fit ​​gasket 46 was punched on the inner circle, the threaded section 43 of the screw 4 was processed with an external thread 45, and then the snap-fit ​​gasket 46 was inserted into the transition section 42 of the screw 4. However, this method has two defects. First, with this method, the vibration plate 12 cannot be used for automatic vibration feeding. The snap-fit ​​gasket 46 can only be placed on the transition section 42 manually, and then placed on each chair back mounting column A1 manually, which is cumbersome to operate. Second, there is a situation where the snap-fit ​​gasket 46 cannot be inserted or is easy to fall out after being inserted. Therefore, the applicant has made a request to the applicant for the proposed method. The improvement is that the inner circle of the snap-fit ​​gasket 46 is first punched, the snap-fit ​​gasket 46 is inserted into the unprocessed shaft body of the screw 4, and then the threaded section 43 of the screw 4 shaft body is processed with an external thread 45, and the snap-fit ​​gasket 46 is limited by the external thread 45 to be separated from the transition section 42. This has the advantage that the snap-fit ​​gasket 46 can be prevented from being separated from the transition section 42, and the vibration plate 12 can be used for material selection and discharge without manual assembly. In addition, in this embodiment, a circle of limiting threads is provided on the end of the threaded section 43 close to the transition section 42 along the circumference of the screw 4 shaft body, and the outer circle diameter of the limiting threads is larger than the inner circle diameter of the snap-fit ​​gasket 46, so as to limit the snap-fit ​​gasket 46 from moving downward along the axial direction of the screw 4 shaft body.

[0035] In addition, in the present embodiment, the snap-fit ​​gasket 46 can be movably displaced on the shaft of the screw 4 located on the transition section 42, and its displacement range is the axial length of the transition section 42. Of course, in some embodiments, the snap-fit ​​gasket 46 is fixedly connected to the transition section 42 and cannot be movably displaced. The purpose of setting it to be movably displaced in the present embodiment is to improve its flexibility in application, because after it is screwed into the seat back mounting column A1, the snap-fit ​​gasket 46 is clamped and positioned between the screw head 41 and the seat back mounting column A1, and each seat back mounting column A1 has a different height and a different depth of internal thread processing, so it is set to be movably displaced to adapt to different seat back mounting column A1 structures.

[0036] A bushing 47 is fixedly connected to the inner ring of the snap gasket 46. The bushing 47 is on the same axis as the inner ring. The inner diameter of the inner hole of the bushing 47 is slightly larger than the outer wall diameter of the screw shaft of the screw 4 on the transition section 42 and smaller than the radial diameter of the screw head 41. When the bushing 47 moves downward to the threaded section 43, the external thread 45 restricts the further downward movement of the bushing 47. The purpose of setting the bushing 47 is to increase the contact area between its inner ring and the shaft wall of the transition section 42. In other words, if the bushing 47 is not set, the inner ring of the snap gasket 46 and the shaft wall of the transition section 42 are in line contact, while setting the bushing 47 results in surface contact, enhancing the stability of the two.

[0037] The screw feeding mechanism 1 includes a vibrating bowl 12 and a discharge track 13 connected to the discharge end of the vibrating bowl 12. The track surface of the discharge track 13 forms a delivery channel 14 through which the screw shaft of the screw 4 can pass and which restricts the passage of the gasket on the screw 4. At least one section of the delivery channel 14 is provided with a warning device. The warning device includes a sensing part 15, a switch part 17 and an alarm part 16. The sensing part 15 is located above the delivery channel 14, and the sensing end of the sensing part 15 faces the delivery channel 14 to detect the screw 4 moving on the delivery channel 14. The switch part 17 is arranged in the discharge track 13 and is located below the delivery channel 14. The switch part 17 is opposite to the sensing end. The alarm part 16 is triggered to start or close based on the signal received by the switch part 17. Within a preset time range, the switch part 17 continuously receives the signal transmitted by the sensing part 15 to trigger the start of the alarm part 16. The purpose of the warning device is that this screw 4 is different from ordinary screws 4. During the vibration of ordinary screws 4, the traditional screws 4 are in smooth point contact or line contact with each other. It is not easy for the latter screw 4 to push the former screw 4 forward and cause blockage. However, during the vibration of the screw 4 described in this embodiment, the snap gaskets 46 are in contact with each other between the teeth 461 of the snap gaskets 46. When the teeth 461 are intertwined with each other or the latter tooth 461 is easily inserted into the bottom of the former tooth 461, blockage may occur. Therefore, the warning device is set. The principle of this warning device is that when there is no obstacle blocking between the sensing part 15 and the switch part 17, the switch part 17 can smoothly receive the signal transmitted by the sensing part 15. If the switch part 17 continuously receives the signal transmitted by the sensing part 15 within a preset time range, such as within 20 seconds, the alarm part 16 is triggered to start. The starting method of the alarm part 16 can be a warning light or a beeping sound, etc., to remind the staff to check whether there is no screw 4 or whether the screw 4 is blocked during the vibration displacement process.

[0038] In this embodiment, a material waiting assembly 11 is provided at the end of the discharging track 13. The material waiting assembly 11 includes a fixed seat 112, a turntable 113 and a servo motor. The turntable 113 is movably embedded in the fixed seat 112, and the surface of the turntable 113 is flush with the surface of the fixed seat 112. The output shaft of the servo motor is connected to the center of the turntable 113 and drives the turntable 113 to rotate circumferentially relative to the fixed seat 112. Four material waiting stations 111 are evenly distributed on the circumferential edge of the turntable 113 from the center to the required radius distance. The angle formed by adjacent material waiting stations 111 and the center point of the turntable 113 is 45°. The material waiting station 111 is a U-shaped notch, and the notch diameter is larger than the radial diameter of the screw shaft and smaller than the diameter of the gasket. Each time the turntable 113 rotates, the notch is rotated to communicate with the channel opening of the delivery channel 14. The material waiting station 111 is used to receive the screws 4 delivered by the discharging track 13 and rotate the screws 4 to the designated discharging position, which is the discharging end mentioned above. The reason for setting the material waiting assembly 11 is to ensure that there are at least 2 screws 4 left on at least 2 material waiting stations 111. A fiber optic sensor is provided in the fixed seat 112. The fiber optic sensor is located at the designated discharging position and is used to detect whether there is a screw 4 on the material waiting station 111 rotated to the designated discharging position. The fiber optic sensor and the servo motor are both electrically connected to the same controller. The further effect of the fiber optic sensor is described by the following method,

[0039] A vibration mechanism 18 is provided at the bottom of the discharge track 13. The vibration mechanism 18 is used to vibrate the discharge track 13 to drive the screw 4 located on the discharge track 13. The vibration mechanism 18 and the servo motor are both electrically connected to the same controller. When the servo motor drives the turntable 113 to rotate and one of the material waiting stations 111 is rotated to communicate with the channel opening of the delivery channel 14, the vibration mechanism 18 is started to vibrate the screw 4 at the end of the discharge track 13 onto the material waiting station 111. The vibration mechanism 18 includes a mounting seat, a vibration source 181 and a linkage mechanism; the linkage mechanism includes an upper mounting plate, a lower mounting plate, a left diagonal connecting plate and a right diagonal connecting plate. The upper mounting plate, the right diagonal connecting plate, the lower mounting plate and the left diagonal connecting plate are sequentially connected end to end to form a parallelogram structure. The parallelogram structure is inclined in the delivery direction of the discharge track 13; the lower mounting plate is mounted above the mounting seat, and the bottom of the discharge track 13 is mounted above the upper mounting plate; the vibration source 181 is mounted on a positioning plate 182, and the left and right sides of the positioning plate 182 are respectively connected to the left diagonal connecting plate and the right diagonal connecting plate. The specific structure of the vibration mechanism 18 is the prior art and will not be elaborated too much. The function of the vibration mechanism 18 is on the one hand to enable the discharge track 13 to vibrate and discharge smoothly, and on the other hand to cooperate with the servo motor. Whenever one of the material waiting stations 111 is docked with the delivery channel 14, the vibration mechanism 18 can vibrate the first screw 4 at the end of the delivery channel 14 onto the material waiting station 111.

[0040] In addition, the vibrating disk 12 is provided with a material cylinder. A spirally arranged vibration track is provided on the side wall of the material cylinder. The vibration track includes a first material selection section and a second material selection section. The vibration track in the first material selection section includes a first bottom plate arranged along the conveying direction. The screw head 41 and the gasket vibrate and displace downward on the first bottom plate; the second material selection section is composed of a second bottom plate and side plates arranged on both sides of the second bottom plate. The bottom of the side plates on both sides is turned inward to form flanging. There is a clearance area between the two flangings. The discharge track 13 has the same structure as the second material selection section. The clearance area is the delivery channel 14; the end of the first material selection section is obliquely connected to the head of the second material selection section through a turning section; the turning section includes a turning plate and a supporting plate. The turning plate gradually twists from horizontal to inclined and is located above the head of the second material selection section. The supporting plate is vertically arranged on the side of the turning plate close to the second material selection section. The supporting plate is used to support the edge of the gasket of the screw 4 during the turning process; that is, the orientation of the screw 4 is changed, and the screw 4 is discharged in a state where the threaded section 43 is downward and the concave surface of the buckled gasket 46 is downward and the screw head 41 is upward.

[0041] The backrest clamping and fixing mechanism 2 includes a backrest positioning table 26 and clamping components respectively arranged at the top, bottom and both sides of the backrest positioning table 26; the backrest positioning table 26 is used for positioning and installing the backrest A of the screw 4 to be screwed, and the clamping component includes a driving part and a pressing part connected to the driving part. By rotating or telescoping the pressing part of the driving part, the backrest A is clamped and positioned on the backrest positioning table 26. The backrest positioning table 26 includes a plurality of first positioning blocks 21 arranged along the outer contour shape of the backrest A; the inner end of the first positioning block 21 is lower than the height of the outer end, and the surfaces of the first positioning blocks 21 for placing the backrest A are all inclined surfaces with a certain arc. A raised block for positioning the backrest A is provided at the outer end of the first positioning block 21. In this embodiment, four rows of first positioning blocks 21 are horizontally arranged from the top to the bottom of the backrest positioning table 26, and each row is composed of at least two first positioning blocks 21. The first positioning blocks 21 in the first row are used for positioning the top of the backrest A; the first positioning blocks 21 in the second row are used for positioning both sides of the backrest A at the human shoulder; the first positioning blocks 21 in the third row are used for positioning both sides of the backrest A at the human waist; the first positioning blocks 21 in the fourth row are used for positioning the bottom of the backrest A. The first row is composed of four first positioning blocks 21 arranged horizontally. The surfaces of the four first positioning blocks 21 are connected to form a surface with a concave arc, which is adapted to the surface arc at the top of the backrest A. The ends of these four first positioning blocks 21 facing the top are all raised to form convex blocks, and the convex blocks are used for positioning the top edge of the backrest A. The top and bottom ends of the two first positioning blocks 21 in the fourth row mentioned above are both raised to form convex blocks, and the convex block at the bottom end is used for positioning the bottom edge of the backrest A. The backrest A positioning table 26 further includes a second positioning block 22, and the second positioning block 22 is located in the area enclosed by a plurality of first positioning blocks 21. The second positioning block 22 is used for raising the center of the backrest A, and the top surface of the second positioning block 22 is flush with the inner end surface of the first positioning block 21; a flexible layer is covered on the surface of the first positioning block 21 and / or the second positioning block 22 and / or the pressing part, and the flexible layer is silica gel, rubber or sponge to prevent the backrest A from being scratched when being clamped, etc. In addition, in this embodiment, the driving parts of the clamping components arranged on both sides and the top of the backrest positioning table 26 are all rotary cylinders 23. The pressing part serves as an upper clamp, and the first positioning block 21 serves as a lower clamp. The backrest A is clamped and positioned between the upper clamp and the lower clamp; the clamping component arranged at the bottom of the backrest positioning table 26 includes a telescopic cylinder 25 and a pressing plate 24 connected to the output end of the telescopic cylinder 25. The telescopic cylinder 25 drives the pressing plate 24 to move inward, and the inner side surface of the pressing plate 24 abuts against and positions the bottom edge of the backrest A. The clamping of the pressing plate 24 causes the backrest A to be subjected to a squeezing force, so that the backrest A has a certain tension.

[0042] The above-mentioned installation rack can be implemented in various ways. One way is that the installation rack adopts a three-axis moving mechanism, where the X-axis, Y-axis, and Z-axis can all move. If a three-axis moving mechanism is adopted, the backrest A positioning table 26 can be fixedly installed, and the manipulator 32 is driven by the three-axis moving mechanism to complete the entire process from grasping, transporting to screwing the screw 4. Another way is the solution provided in this embodiment. Specifically, the installation rack includes a machine table 34 and a fixed frame 33 arranged above the machine table 34. A transverse X-direction guide rail as shown in Figure 3 is laid on the crossbeam of the fixed frame 33. The lifting arm 31 is slidably arranged on the transverse guide rail. The transverse sliding direction of the lifting arm 31 is the same as the displacement direction of the screw 4 on the discharge track 13. A longitudinal Y-direction guide rail as shown in Figure 3 is laid on the machine table 34. A slider is arranged at the bottom of the backrest positioning table 26, and the slider is arranged on the longitudinal guide rail. After each row of screws 4 on the backrest mounting posts A1 is installed, the machine table 34 drives the backrest positioning table 26 to move forward in the Y direction, so that the next row of backrest mounting posts A1 and the designated discharge position are on the same straight line. The manipulator 32 can adopt a pneumatic suction electric screwdriver.

[0043] This embodiment also provides a backrest screwing system, which includes the above-mentioned implementation scheme of the backrest mounting screw machine.

[0044] This embodiment also provides a backrest screwing installation method, and its steps are as follows:

[0045] Step 1: Place the side of the backrest A with the backrest mounting posts A1 facing up on the backrest positioning table 26, and start the button. The clamping components at the top, bottom, and both sides of the backrest positioning table 26 run synchronously, and the pressing parts press on the corresponding positions of the backrest A respectively to clamp and position the backrest A on the backrest positioning table 26.

[0046] Step 2: Start the screw feeding mechanism 1. The scattered screws 4 inside are vibrated out through the vibrating disk 12 with the screw heads 41 and gaskets facing down, and vibrated onto the discharge track 13. Along the direction of the delivery channel 14, the screws 4 are vibrated and displaced to the discharge end for the manipulator 32 to pick up and discharge, where the discharge end is the designated discharge position.

[0047] Step 3: During the vibrating displacement of the screw 4 on the discharge track 13, the continuous blocking switch part 17 receives the signal transmitted by the induction part 15, and the alarm part 16 will not be triggered; if within the preset time range, the switch part 17 continuously receives the signal transmitted by the induction part 15 to trigger the start of the alarm part 16; wherein, the preset time range is between 20S and 30S, that is, within 20S to 30S seconds, there is no screw 4 blocking the signal transmission between the switch part 17 and the induction part 15, indicating that during the vibrating displacement of the screw 4 on the discharge track 13, a blocking situation occurs, resulting in the screw 4 being unable to pass through the discharge section of the discharge track 13. Therefore, it is necessary to trigger the alarm part 16 to turn on, emitting an alarm beeping sound to prompt the staff to detect the situation on the discharge track 13 and timely dial the screw 4 to restore the normal discharge speed, ensuring that the screw 4 can vibrate and displace normally on the discharge track 13.

[0048] Step 4: The manipulator 32 moves synchronously with the lifting arm 31 above the discharge end, grabs the screw 4 located at the discharge end, and moves it above one of the chair back mounting posts A1 of the chair back A located on the chair back positioning table 26.

[0049] Step 5: The lifting arm 31 drives the manipulator 32 to move downward, places the grabbed screw 4 on the chair back mounting post A1, and the manipulator 32 screws the screw 4 into the chair back mounting post A1; when the manipulator 32 screws the screw 4 into the chair back mounting post A1, the fastening gasket 46 is clamped and positioned by the screw head 41 and the top of the chair back mounting post A1, and the fastening gasket 46 is clamped and deformed.

[0050] Step 6: Repeat the above steps to complete the installation of the screw 4 for the next chair back A.

[0051] Among them, the step 2 further includes:

[0052] Step 2.1: The screw 4 is vibrated by the vibrating disk 12 from the discharge track 13 to one of the waiting material stations 111, and the servo motor drives the turntable 113 to rotate circumferentially, rotates the screw 4 to the specified discharge position, and the fiber optic sensor recognizes the screw 4 at the specified discharge position, then pauses the servo motor from continuing to move and waits for the manipulator 32 to grab.

[0053] Step 2.2: If the screw 4 fails to be successfully vibrated to the waiting material station 111, resulting in the servo motor driving the turntable 113 to rotate circumferentially, when the waiting material station 111 rotates to the specified discharge position and the fiber optic sensor cannot recognize the existence of the screw 4, the servo motor is directly started to continue rotating.

[0054] In step 4, the horizontal movement of the lifting arm 31 is used to grasp the screw 4 and perform the handling process of placing the screw 4 on the backrest A. By longitudinally translating with the backrest positioning table 26, the screw 4 is placed on the target backrest mounting post A1, and the screw 4 is screwed into the backrest mounting post A1 by a pneumatic suction electric screwdriver.

[0055] Step 5 further includes:

[0056] Step 5.1: If the screw 4 sensor provided on the manipulator 32 detects that the manipulator 32 successfully grasps the screw 4, the detection pulse signal is fed back to the controller. If the controller receives the signal, it controls the manipulator 32 to perform the handling action. If it is not detected that the manipulator 32 successfully grasps the screw 4, the controller controls the manipulator 32 to perform a repair action, which is to drive the lifting arm 31 again to drive the manipulator 32 to move down to grasp the screw 4.

[0057] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the drawings are only examples and do not limit the present invention.

[0058] The object of the present invention has been completely and effectively achieved. The functions and structural principles of the present invention have been shown and described in the embodiments. Without departing from the above principles, the embodiments of the present invention can have any deformation or modification.

Claims

1. A backrest mounting screw machine, characterized in that, Comprising: A screw feeding mechanism (1), including a vibrating disk (12) and a discharge track (13) connected to the discharge end of the vibrating disk (12). The track surface of the discharge track (13) forms a delivery channel (14) through which the screw shaft of the screw (4) can pass and which restricts the passage of the gasket on the screw (4). At least one section of the delivery channel (14) is provided with a warning device. The warning device includes a sensing part (15), a switch part (17), and an alarm part (16). The sensing part (15) is located above the delivery channel (14), and the sensing end of the sensing part (15) faces the delivery channel (14) to detect the screw (4) moving on the delivery channel (14). The switch part (17) is located below the delivery channel (14) and is opposite to the sensing end. The alarm part (16) is triggered to start or close based on the signal received by the switch part (17). Within a preset time range, the switch part (17) continuously receives the signal transmitted by the sensing part (15) to trigger the start of the alarm part (16). A chair back clamping and fixing mechanism (2), including a chair back positioning table (26) and clamping components respectively arranged at the top, bottom, and both sides of the chair back positioning table (26). The chair back positioning table (26) is used to position and install the chair back where the screw (4) is to be screwed. The clamping component includes a driving part and a pressing part connected to the driving part. By rotating or expanding and contracting the pressing part through the driving part, the chair back is clamped and positioned on the chair back positioning table (26). The chair back clamping and fixing mechanism (2) is located at an adjacent position to the end of the discharge track (13). And a manipulator assembly (3), including a mounting frame and a manipulator (32) arranged on the mounting frame. A lifting arm (31) is slidably arranged on the mounting frame. The manipulator (32) is arranged at the bottom of the lifting arm (31). The manipulator (32) is driven to move back and forth between the screw feeding mechanism (1) and the chair back clamping and fixing mechanism (2) through the back-and-forth movement and up-and-down lifting of the lifting arm (31). The manipulator (32) grabs the screw (4) located in the screw feeding mechanism (1), places it on the chair back mounting post (A1) located in the chair back clamping and fixing mechanism (2), and screws the screw (4) into the chair back mounting post (A1) for fixation. The chair back positioning table (26) includes a number of first positioning blocks (21) arranged along the shape of the outer contour of the chair back. The inner end of the first positioning block (21) is lower than the outer end in height. The surfaces of the first positioning blocks (21) for placing the chair back are all inclined surfaces with a certain curvature. A protruding block for positioning the chair back is provided at the outer end of the first positioning block (21). The clamping component arranged at the bottom of the chair back positioning table (26) includes a telescopic cylinder (25) and a pressing plate (24) connected to the output end of the telescopic cylinder (25). When the telescopic cylinder (25) drives the pressing plate (24) to move inwards, the inner side wall of the pressing plate (24) abuts against the bottom of the chair back placed on the chair back positioning table (26) for positioning. The driving parts of the clamping components arranged on both sides and the top of the chair back positioning table (26) are all rotary cylinders (23). The pressing part serves as the upper fixture, and the first positioning block (21) serves as the lower fixture. The chair back (A) is clamped and positioned between the upper fixture and the lower fixture.

2. The backrest mounting screw machine according to claim 1, wherein, The installation frame includes a machine table (34) and a fixing frame (33) arranged above the machine table (34). A transverse guide rail is laid on the cross beam of the fixing frame (33). The lifting arm (31) is slidably arranged on the transverse guide rail. The transverse sliding direction of the lifting arm (31) is the same as the displacement direction of the screw (4) on the discharging track (13). A longitudinal guide rail is laid on the machine table (34). A slider is arranged at the bottom of the chair back positioning table (26), and the slider is arranged on the longitudinal guide rail.

3. The backrest mounting screw machine according to claim 1, characterized in that A waiting material component (11) is arranged at the end of the discharging track (13). The waiting material component (11) includes a fixed seat (112), a turntable (113) and a servo motor. The turntable (113) is movably embedded in the fixed seat (112), and the surface of the turntable (113) is flush with the surface of the fixed seat (112). The output shaft of the servo motor is connected to the center of the turntable (113) and drives the turntable (113) to rotate circumferentially relative to the fixed seat (112). A plurality of waiting material stations (111) are evenly distributed on the circumferential edge from the center of the turntable (113) to the required radius distance. The waiting material stations (111) are used to receive the screws (4) delivered by the discharging track (13) and rotate the screws (4) to the designated discharging position.

4. The backrest mounting screw machine according to claim 3, characterized in that, Four waiting material stations (111) are arranged on the turntable (113). The angle formed by adjacent waiting material stations (111) and the center point of the turntable (113) is 45°. The waiting material stations (111) are U-shaped notches. The notch diameter is larger than the radial diameter of the screw shaft and smaller than the diameter of the gasket. Each time the turntable (113) rotates, the notch is rotated to communicate with the channel opening of the delivery channel (14).

5. The backrest mounting screw machine according to claim 3, wherein, An optical fiber sensor is arranged in the fixed seat (112). The optical fiber sensor is located at the designated discharging position and is used to detect whether there is a screw (4) on the waiting material station (111) rotated to the designated discharging position. The optical fiber sensor and the servo motor are both electrically connected to the same controller.

6. The backrest mounting screw machine according to claim 3, characterized in that, A vibration mechanism (18) is arranged at the bottom of the discharging track (13). The vibration mechanism (18) is used to vibrate the discharging track (13) to drive the screws (4) located on the discharging track (13). The vibration mechanism (18) and the servo motor are both electrically connected to the same controller. When the servo motor drives the turntable (113) to rotate and rotates one of the waiting material stations (111) to communicate with the channel opening of the delivery channel (14), the vibration mechanism (18) is started to vibrate the screws (4) at the end of the discharging track (13) onto the waiting material stations (111).

7. The backrest mounting screw machine according to claim 1, characterized in that, The vibrating bowl (12) is provided with a barrel, and a spirally arranged vibrating track is provided on the side wall of the barrel. The vibrating track includes a first material selection section and a second material selection section. The vibrating track in the first material selection section includes a first bottom plate arranged along the conveying direction, and the screw head (41) and the gasket vibrate and displace downward on the first bottom plate. The second material selection section is composed of a second bottom plate and side plates arranged on both sides of the second bottom plate. The bottoms of the side plates on both sides are turned inward to form flanges, and there is a clearance area between the two flanges. The clearance area is the delivery channel (14). The end of the first material selection section is obliquely connected to the head end of the second material selection section through a turning section.

8. The backrest mounting screw machine according to claim 1, characterized in that, The chair back positioning table (26) is horizontally provided with four rows of first positioning blocks (21) from top to bottom in sequence. Each row is composed of at least two first positioning blocks (21). The first positioning blocks (21) in the first row are used to position the top end of the chair back. The first positioning blocks (21) in the second row are used to position both sides of the chair back at the human shoulders. The first positioning blocks (21) in the third row are used to position both sides of the chair back at the human waist. The first positioning blocks (21) in the fourth row are used to position the bottom of the chair back.

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