Forming process of chair seat

Abstract

The invention provides a chair seat forming process which comprises the steps of presetting a seat plate and a seat cushion, positioning, flanging, tightening and the like, the shape of the seat plate is matched with that of the seat cushion, and the outer contour area of the seat cushion is larger than that of the seat plate; the seat cushion comprises a soft cushion and covering cloth, and a pull rope is connected to the outer periphery of the covering cloth in a surrounding manner; the integral annular connecting part of the seat cushion is sequentially positioned and flanged, and the side connecting parts are tightened by the pull ropes and then uniformly cling to the inner side of the back surface of the seat plate, so that the seat cushion is stably connected to the seat plate, the forming difficulty of the seat is reduced, the manufacturing efficiency of the seat is improved, and the quality and the service life of the seat are ensured.

Description

Technical Field

[0001] The invention relates to the field of chairs, and in particular to a molding process for a chair seat. Background Art

[0002] There are many structures of chair seats on the market, and most of them adopt the structure of seat cushion wrapped seat plate. When processing and manufacturing this kind of chair seat, a seat cushion matching the shape of the seat plate is first placed on the front of the seat plate, and then the outer peripheral part of the seat cushion is flanged and fit on the back of the seat plate, and then nails are driven into the flanged part to fix the seat cushion on the seat plate.

[0003] When the seat plate and the seat cushion are of regular shapes, a chair seat of qualified quality can be produced according to the above processing method; however, when the seat plate and the seat cushion are not of regular shapes, the quality of the chair seat produced according to the above processing method will be affected.

[0004] For example, when the shape of the seat cushion and the seat plate is heart-shaped, since the outer contour of the heart-shaped seat plate is irregular, it is easy to cause flanging difficulties and uneven flanging width when the seat cushion is flanging, making it difficult to produce special-shaped seats and affecting the production efficiency of the seats.

[0005] Although the flanged portion of the seat cushion will be fixed to the back of the seat plate with nails later, when sitting down, the uneven width of the flanged portion will cause different forces at different positions on the seat cushion, affecting the quality and service life of the seat. Summary of the invention

[0006] In order to solve the above-mentioned technical problems, the purpose of the present invention is to provide a molding process for a chair seat, by positioning and flanging the annular connecting part of the entire seat cushion in sequence, and making the side connecting part evenly close to the inner back side of the seat plate after being tightened by a pull rope, so that the seat cushion is stably connected to the seat plate, thereby reducing the difficulty of seat molding, improving the production efficiency of the seat, and ensuring the quality and service life of the seat.

[0007] The technical solution of the present invention is achieved in this way: A molding process for a chair seat comprises the following steps: S1: pre-set seat plate and cushion; the chair seat comprises a seat plate and a cushion matching the shape of the seat plate, the outer contour area of ​​the cushion is larger than the outer contour area of ​​the seat plate; the seat cushion comprises a soft cushion and a cover cloth covering the soft cushion, a pull rope is connected around the outer periphery of the cover cloth, and both ends of the pull rope are exposed from the cover cloth to form two pulling sections; S2: Positioning; placing the seat cushion on the front of the seat plate so that the seat cushion forms an annular connecting portion extending outwardly beyond the seat plate; then folding the annular connecting portions on both sides of the seat plate toward the back of the seat plate and fixing them to the seat plate by means of nail guns, thereby dividing the annular positioning portion into two positioning portions fixed on the back of the seat plate and two side connecting portions not connected to the seat plate; S3: Flanging; lay the seat flat with the back of the seat plate facing upward, and then apply external force downward to the middle of the back of the seat plate to deform the seat cushion, and at the same time, cause the two side connecting parts to be flanged toward the inner side of the back of the seat plate; S4: tightening; tightening the two pulling sections by external force, so that the two side connecting parts are tightened and fit to the inner side of the back of the seat plate, thereby combining the seat cushion and the seat plate into an integral seat.

[0008] Preferably, in step S4, the pulling sections of the two tightened pull ropes are attached to the annular connecting portion and fixed to the seat plate by nails; the fixed pulling sections can keep the pull ropes in a tightened state at all times to prevent loosening between the side connecting portion and the seat plate.

[0009] Preferably, in step S3, the seat is placed on a seat forming device, which includes a frame, to which is connected a bearing mechanism for supporting the seat, and a press-fitting assembly located directly above the bearing mechanism, the press-fitting assembly including a first driving member and a pressing head connected to the first driving member, the first driving member being able to drive the pressing head to move up and down; in step S3, the first driving member drives the pressing head downward and acts on the middle position of the back side of the seat plate to deform the seat cushion, so as to cause the two side connecting parts to be flanged toward the inner position of the back side of the seat plate; during the flanging process, it is only necessary to place the seat on the bearing mechanism and cooperate with the press-fitting assembly, and the seat forming device ensures the molding quality of the seat and improves the molding efficiency of the seat.

[0010] Preferably, the first driving member is a cylinder that can be extended up and down, and the cylinder has a first piston rod that can be extended up and down. The pressure head is threadedly connected to the bottom end of the first piston rod and locked by a nut; in step S3, the force of the pressure head on the seat plate can be adjusted by changing the threaded matching length of the first piston rod and the pressure head and then locking it by a nut.

[0011] Preferably, an auxiliary profiling member is connected to the supporting mechanism, and the auxiliary profiling member has a model groove with an open upper end, and the contour shape and size of the model groove match the shape and size of the outer contour of the seat plate; in step S3, the seat cushion of the chair is placed downward on the upper end of the auxiliary profiling member, and when the pressure head acts downward on the middle position of the back of the seat plate, the seat cushion sinks downward into the model groove, and the outer peripheral edge of the seat plate and the side wall of the model groove act on the inner and outer sides of the side connecting part respectively, so as to guide the side connecting part to be flanged toward the back of the seat plate; so that the side connecting part can be flanged toward the back of the seat plate more naturally and smoothly, thereby improving the molding quality of the seat.

[0012] Preferably, the seat forming device also includes a wire pulling mechanism symmetrically arranged on both sides of the supporting mechanism, the wire pulling mechanism includes a second driving member and a tensioner connected to the second driving member; the second driving member can drive the tensioner to move left and right; in step S4, the two pulling sections of the pull rope are first connected to the tensioner, and then the tensioner moves along the left and right directions under the action of the second driving member and tightens the pulling sections, so that the side connecting part is tightened and fits against the inner side of the back of the seat plate; the wire pulling mechanism can replace the manual operation of the worker, and when tightening the pull rope, it only needs to connect the pulling section to the corresponding tensioner, which simplifies the operation process and improves the forming efficiency of the seat.

[0013] Preferably, the wire pulling mechanism also includes a bracket for installing a second driving member, and the bracket is symmetrically arranged on the left and right sides of the supporting mechanism. In step S4, the bracket can rotate forward and backward and stop at a corresponding position to adapt to the extension direction of the pulling section; to avoid the pull rope from separating from the outer edge of the covering cloth.

[0014] Preferably, the bracket rotates back and forth along an arc-shaped trajectory, and the bracket is provided with a plurality of waist-shaped grooves extending along the arc-shaped rotation trajectory, and the supporting mechanism is provided with a plurality of screw holes corresponding to the positions of the waist-shaped grooves. In step S4, after the bracket is rotated back and forth into position, the corresponding screws pass through each waist-shaped groove and are screwed into the screw holes to lock the bracket on the supporting mechanism, so that the bracket that has been rotated into position stays at the corresponding position.

[0015] Preferably, the supporting mechanism includes a base plate, and a first support plate and a second support plate spaced apart front and rear are provided on the upper end of the base plate, and the second support plate can slide back and forth on the base plate; in step S3, the second support plate can slide back and forth and change the distance between it and the first support plate to adapt to the front and rear width of the seat.

[0016] Preferably, a sliding seat that can slide back and forth is connected to the frame of the chair seat forming device, and the sliding seat is connected to the bottom end of the supporting mechanism by a column. In step S3, the sliding seat can slide back and forth and then stop at a corresponding position, so that the middle position of the back of the seat plate is aligned with the pressure head; to ensure that the back of the seat plate is subjected to steady force and that the side connection part is evenly flanging.

[0017] Preferably, the upright column is a telescopic rod that can be raised and lowered. In step S3, the telescopic rod can be raised and lowered to adjust the distance between the seat and the pressure head to a desired position to accommodate seats of different thicknesses.

[0018] Preferably, the telescopic rod includes a fixed rod and a movable rod that can be lifted up and down relative to the fixed rod, the movable rod and the fixed rod are respectively connected to the bearing mechanism and the sliding seat; a positioning piece that can slide laterally is connected to the frame, and the positioning piece is connected to the fixed rod; in step S3, when the sliding seat slides back and forth into place, the positioning piece can slide laterally with the sliding seat and stay in the corresponding position to form a laterally positioning for the telescopic rod, thereby preventing the telescopic rod from falling over due to lack of lateral positioning.

[0019] The present invention provides a molding process for a chair seat, which has the following advantages over the prior art: 1. The annular connection part of the seat cushion that extends beyond the seat plate is connected to the seat plate in steps according to the positioning and flanging steps. The positioning step can connect the two side parts of the annular connection part to the seat plate, reducing the difficulty of flanging the side connection part; so that the seat cushion can be deformed by only acting on the back of the seat plate, and the side connection part can be evenly flanging and tightened by a drawstring, thereby ensuring the molding quality and service life of the seat after molding, and also improving the molding efficiency of the seat.

[0020] 2. The process of flanging and tightening the drawstring is carried out by using the press-fitting components and the wire drawing mechanism on the seat molding device, which simplifies the molding steps of the seat, reduces the molding difficulty of the seat, and further improves the molding efficiency of the seat.

[0021] 3. The seat forming device is provided with a bracket which can swing back and forth and stop at a corresponding position. The bracket is used to connect the second driving member. The swinging design of the bracket can change the tightening direction of the tightening pulling section so that the tightening direction adapts to the extension direction of the pull rope on the cover cloth, thereby preventing the pull rope from falling off from the edge of the cover cloth when tightening the side connection part. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a structural schematic diagram of a chair seat forming device; Figure 2 is a structural schematic diagram of the seat forming device at another angle; Figure 3 It is an enlarged view of the adjustment mechanism and the positioning mechanism; Figure 4 A schematic diagram of arranging the seat cushion on the front side of the seat plate; Figure 5 A schematic diagram of the positioning parts on both sides of the seat cushion being fixed to the back of the seat plate; Figure 6 is a top view of a chair seat forming device; Figure 7 A schematic diagram of placing the positioned seat cushion on the upper end of the auxiliary contour member; Figure 8 Schematic diagram of the side connection part being flanged and tightened on the back of the seat plate under the action of the pull wire assembly; Fig. 9 Schematic diagram of the pulling section of the draw rope being fixed to the seat plate by means of nails; Fig.10 A schematic diagram of the bracket deflecting forward and backward to adapt to the extension direction of the pull rope; Fig.11 A flowchart of the method steps of the present invention; The reference numerals of the drawings are: 1-seat plate, 2-cushion, 3-covering cloth, 4-annular connecting part, 4a-gun nail, 5-frame, 6-auxiliary profiling part, 7-pressing assembly, 8-auxiliary material plate, 9-pull wire assembly, 10-positioning mechanism, 11-adjusting mechanism, 12-bottom plate, 12a-slide groove, 12b-screw rod, 111-fixed rod, 111a-movable rod, 91-bracket, 91-second driving member, 93-tensioner, 31-pull rope, 32-pulling section, 41-positioning part, 42-side connecting part, 5 1-mounting frame, 52-roller, 61-model groove, 71-pressure head, 72-first driving member, 73-nut, 81-avoidance area, 101-positioning member, 102-support plate, 103-sliding sleeve, 104-sliding support shaft, 105-support, 121-first support plate, 122-second support plate, 122a-screw hole, 123-limiting cap, 124-sliding support rod, 125-sliding adjustment member, 721-first piston rod, 911-waist groove, a-sleeve, b-set screw. DETAILED DESCRIPTION

[0023] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0024] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0025] like Figure 1-11 As shown, the specific implementation of the present invention is as follows: The present invention provides a molding process for a chair seat, comprising the following steps: S1: pre-set seat plate 1 and cushion; Figure 4 As shown, the chair seat comprises a seat plate 1 and a cushion matched with the shape of the seat plate 1. The seat plate 1 is usually a wooden board. The shape matching does not mean size matching, but only matching in appearance. For example, if the seat plate is trapezoidal, the cushion is also trapezoidal. The outer contour area of ​​the cushion is larger than the outer contour area of ​​the seat plate 1. The cushion comprises a soft pad 2 and a cover cloth 3 covering the soft pad 2. A drawstring 31 is connected around the outer periphery of the cover cloth 3. Both ends of the drawstring 31 are exposed from the cover cloth 3 to form two pulling sections 32. S2: Positioning; e.g. Figure 5As shown, the seat cushion is arranged on the front side of the seat plate 1, so that the seat cushion forms an annular connecting portion 4 that extends outwardly beyond the seat plate 1; the front side of the seat plate 1 refers to the side of the chair seat used for sitting, and the back side refers to the side opposite to the front side; at this time, the cushion 2 is in contact with the front side of the seat plate 1, and the cover cloth 3 is in contact with the seat surface of the cushion 1; then, the annular connecting portions 4 opposite to each other on both sides of the seat plate 1 are folded toward the back side of the seat plate 1 and fixed to the seat plate 1 through nails 4a, so that the annular positioning portion 41 is divided into two positioning portions 41 fixed on the back side of the seat plate 1 and two side connecting portions 42 not connected to the seat plate 1; after this step, the seat cushion and the seat plate 1 can be initially positioned to avoid the position deviation of the seat cushion and the seat plate 1 in the next step of processing, and at the same time reduce the difficulty of flanging the side connecting portion 42; S3: Flanging; lay the seat flat with the back of the seat plate 1 facing upward, and then apply external force downward to the middle of the back of the seat plate 1 to deform the seat cushion, and at the same time cause the two side connecting portions 42 to be flanged toward the inner side of the back of the seat plate 1; S4: Tightening; the side connection part 42 is not completely attached to the back of the seat plate 1 after being turned up, so it is necessary to tighten the side connection part 42 through the pull rope 31. Therefore, in this step, the two pulling sections 32 need to be tightened by external force to tighten the two side connection parts 42 and fit them to the inner side position of the back of the seat plate 1, thereby combining the seat cushion and the seat plate 1 into an integral seat.

[0026] Further, if Fig. 9 As shown, tightening the two pulling sections 32 can tighten the side connection part 42 on the inner side of the back side of the seat plate 1, but in order to prevent the pull rope 31 from loosening after tightening, the pulling section 32 needs to be tightened. Therefore, in step S4, the pulling sections 32 of the two tightened pull ropes 31 are attached to the annular connection part 4 and fixed to the seat plate 1 by the nails 4a; the fixed pulling section 32 can make the pull rope 31 always in a tightened state to prevent the side connection part 41 and the seat plate 1 from loosening.

[0027] Further, if Figure 1-3 As shown, in order to improve the molding quality and efficiency of the seat, in step S3, the seat is placed on a seat molding device, the seat molding device includes a frame 5, the frame 5 is connected with a bearing mechanism for supporting the seat, and a press-fitting assembly 7 located directly above the bearing mechanism, the press-fitting assembly 7 includes a first driving member 72, and a pressing head 71 connected to the first driving member 72, the first driving member 72 can drive the pressing head 71 to move up and down; in step S3, the first driving member 72 drives the pressing head 71 to move downward and acts on the middle position of the back of the seat plate 1 to deform the cushion, so as to cause the two side connecting parts 42 to be flanged toward the inner position of the back of the seat plate 1; when performing the flanging process, it is only necessary to place the seat on the bearing mechanism and cooperate with the press-fitting assembly 7, the seat molding device ensures the molding quality of the seat and improves the molding efficiency of the seat.

[0028] Furthermore, in order to ensure that the pressure head 71 can exert sufficient force on the seat plate 1, the first driving member 72 is a cylinder that can be extended and retracted up and down, and the cylinder has a first piston rod 721 that can be extended and retracted up and down. The pressure head 71 and the bottom end of the first piston rod 721 are threadedly connected and locked by a nut 73; the threaded connection makes the longitudinal position of the pressure head 71 adjustable. Specifically, in step S3, the position of the pressure head 71 is fine-tuned by changing the threaded matching length of the first piston rod 721 and the pressure head 71 and then locking it by the nut 73 to adjust the force of the pressure head 71 on the seat plate 1.

[0029] Further, if Figure 6-8 As shown, in order to ensure that the flange of the side connection part 42 is uniform and improve the molding quality of the seat, an auxiliary profiling member 6 is connected to the supporting mechanism, and the auxiliary profiling member 6 is connected to the supporting mechanism by a detachable screw; the auxiliary profiling member 6 has a model groove 61 with an open upper end, and the contour shape and size of the model groove 61 match the shape and size of the outer contour of the seat plate 1; in step S3, the seat cushion is placed on the upper end of the auxiliary profiling member 6 with the back facing downward, and when the pressure head 71 acts downward on the middle position of the back of the seat plate 1, the seat cushion sinks downward into the model groove 61, and the outer peripheral edge of the seat plate 1 is aligned with the side wall of the model groove 61. It acts on the inner and outer sides of the side connection part 42 respectively to guide the side connection part 42 to be flanged toward the back side of the seat plate 1. At this time, the side connection part 42 is clamped between the seat plate 1 and the side wall of the mold groove 61 and folded into a vertical state, and it is much easier to flange the side connection part 42 in the vertical turning state to the back side of the seat plate 1; when the seat cushion sinks to the bottom of the mold groove 61, it will contact and deform with the bottom of the mold groove 61 under the action of the pressure head 71 pressing the seat plate 1, so that the side connection part 42 in the vertical state is flanged toward the back side of the seat plate 1, so that the side connection part 42 is evenly attached to the back side of the seat plate 1.

[0030] Furthermore, the seat forming device also includes a wire pulling mechanism 9 symmetrically arranged on both sides of the supporting mechanism, which can simplify the difficulty of tightening the pull rope 31 and is more labor-saving to operate. Specifically, the wire pulling mechanism 9 includes a second driving member 92 and a tensioner 93 connected to the second driving member 92; the second driving member 91 is a cylinder, and a second piston rod that can be laterally retracted is provided in the cylinder, and the second piston rod is connected to the wire pulling device 93; the second driving member 92 can drive the tensioner 93 to move left and right; in step S4, the two pulling sections 32 of the pull rope 31 are first connected to the tensioner 93, and then the tensioner 93 moves along the left and right directions under the action of the second driving member 92 and tightens the pulling section 32, so that the side connecting part 42 is tightened and fits on the inner side of the back of the seat plate 1; the wire pulling mechanism 9 can replace the manual operation of the worker. When tightening the pull rope 31, it is only necessary to connect the pulling section 32 to the corresponding tensioner 93, which simplifies the operation process and improves the molding efficiency of the seat.

[0031] Further, if Fig.10As shown, after the annular connecting portion 4 of the seat cushion is turned up, the annular connecting portion 4 is tightly around the outer periphery of the seat plate, so the extension shape of the pull rope 31 on the outer periphery of the cover cloth 3 also matches the outer contour shape of the seat plate 1. For example, when the seat plate 1 is square, after the seat cushion is connected to the seat plate 1, the extension track of the pull rope 31 is also square, and the direction is a regular shape. When the pull rope 31 is tightened, it only needs to act on the pulling section 32 laterally. However, when the seat plate 1 is an irregular shape, after the seat cushion is connected to the seat plate 1, the extension track of the pull rope 31 on the outer periphery of the cover cloth 3 will also become an irregular shape. Specifically, if Fig.10 As shown, the shape of the outer contour of the seat cushion in this embodiment is an irregular polygon, and the pulling section 32 of the pull rope 31 is at the intersection of two oblique sides. Therefore, the outward extension direction of the pulling section 32 is not horizontal extension, but oblique extension. At this time, if the pulling section 32 is still tightened by horizontal pulling, the pulling section 32 is easy to tear the cover cloth 3 due to the force direction being different from the extension direction of the pull rope 31, causing the pull rope 31 to separate from the cover cloth 3; to avoid this phenomenon, the wire pulling mechanism 9 also includes a bracket 91 for installing a second driving member 92, and the bracket 91 is symmetrically arranged on the left and right sides of the bearing mechanism. In step S4, the bracket 91 can rotate back and forth and stop at the corresponding position to adapt to the extension of the pulling section 32. Extension direction; its specific structure is as follows: the bracket 91 rotates forward and backward along an arc-shaped trajectory, and the bracket 91 is provided with a plurality of waist-shaped grooves 911 extending along the arc-shaped rotation trajectory, and the supporting mechanism is provided with a plurality of screw holes 122a corresponding to the positions of the waist-shaped grooves 911. In step S4, after the bracket 91 is rotated forward and backward into position, the corresponding screws pass through each waist-shaped groove 911 and are screwed into the screw holes 122a and lock the bracket 91 on the supporting mechanism, so that the bracket 91 rotated into position stays in the corresponding position, so that the tensioner 93 can act obliquely on the pulling section 32 to adapt to the extension direction of the pulling section 32. This design makes it unnecessary to worry about the pull rope 31 falling off from the edge of the cover cloth 3 when the special-shaped seat plate 1 and the cushion are assembled.

[0032] Further, to facilitate adjustment of the supporting position of the seat, the bearing mechanism includes a base plate 12, and a first supporting plate 121 and a second supporting plate 122 are provided at the upper end of the base plate 12, which are spaced front and back, and the second supporting plate 122 can slide back and forth on the base plate 12; in step S3, the second supporting plate 122 can slide back and forth and change the distance between it and the first supporting plate 121 to adapt to the front and back width of the seat, so that the seat is always in a suitable supporting position; specifically, a sliding mechanism is provided between the base plate 12 and the second supporting plate 122, and the sliding mechanism includes a sliding support rod 124 connected to the base plate, and a sliding adjustment member 125 is slidably connected to the sliding support rod 124, and the sliding adjustment member 125 is a sleeve structure, and the sliding adjustment member 124 is connected to the second supporting plate 122, so that the second supporting plate 122 can slide back and forth on the base plate 12, and to prevent the sliding adjustment member 125 from sliding forward out of the sliding support rod 124, a limiting cap 123 with an outer diameter larger than the rod diameter of the sliding support rod 124 is connected to the rear end of the sliding support rod 124.

[0033] Furthermore, the sliding adjustment member 125 that has slid into place should remain fixed so that the seat placed on the supporting mechanism remains stable. A slide groove 12a extending forward and backward is provided on the base plate 12. A locking assembly is connected to the bottom end of the second support plate 122. The locking assembly includes a locking nut and a screw rod 12b inserted into the slide groove 12a. The bottom end of the screw rod 12b extends downward out of the slide groove 12a. When the second support plate 122 can slide forward and backward on the base plate 12 to a predetermined position, the locking nut cooperates with the bottom end of the screw rod 12b and presses the base plate 12, so that the second support plate 122 stays in the predetermined position.

[0034] Furthermore, the seat molding device can assemble seats of different sizes and specifications. Specifically, when the seat size and specification change, it is difficult for the pressure head 71 to align with the middle of the back of the seat plate 1. Therefore, a sliding seat 112 that can slide back and forth is connected to the frame 5 of the seat molding device. The sliding seat 112 is connected to the bottom end of the supporting mechanism through a column. In step S3, the sliding seat 112 can slide back and forth and stop at a corresponding position, so that the middle position of the back of the seat plate 1 is aligned with the pressure head 71; to ensure that the back of the seat plate 1 of the seat to be molded is stably stressed and the side connection portion 41 is evenly flanging; specifically, the frame 5 is provided with and sliding The adjusting mechanism 11 is connected to the seat 112, and the adjusting mechanism 11 includes a sliding support shaft 104, a support 105 supported at both ends of the sliding support shaft 104, a sliding sleeve 103 is slidably connected to the sliding support shaft, the sliding sleeve 103 is connected to the sliding seat 112, the sliding sleeve 103 includes a body and a sleeve a connected to the end of the body, the sleeve a is provided with a threaded hole connected to the sliding support shaft 104, and a set screw b is matched in the threaded hole; the sliding sleeve 103 slides on the sliding support shaft 104 and is tightly pressed against the shaft body of the sliding support shaft 104 through the set screw b, so that the sliding seat 112 slides back and forth and stops at the corresponding position.

[0035] Furthermore, the thickness of seats of different sizes is also different, so the column is a telescopic rod that can be raised and lowered. In step S3, the telescopic rod can be raised and lowered to adjust the distance between the seat and the pressure head 71 to the desired position to accommodate seats of different thicknesses.

[0036] Further, the telescopic rod includes a fixed rod 111, and a movable rod 111a that rises and falls relative to the fixed rod 111, and the movable rod 111a and the fixed rod 111 are respectively connected to the bearing mechanism and the sliding seat 112; although the telescopic rod remains stable in the longitudinal direction, it is suspended in the transverse direction. Therefore, in order to make the telescopic rod more stable, a positioning member 101 that can slide transversely is connected to the frame 5, and the positioning member 101 is connected to the fixed rod 111; in step S3, when the sliding seat 112 slides back and forth into place, the positioning member 101 can slide transversely with the sliding seat 112 and stay in the corresponding position to adjust the telescopic rod. The telescopic rod forms a lateral positioning; the telescopic rod is prevented from falling over due to lack of lateral positioning; specifically, the positioning member 5 in this embodiment is a plate-like structure, but in fact its structure is diverse and can also be rod-shaped. A mounting frame 51 is provided on the frame 5, and a positioning mechanism 10 connected to the positioning member 101 is provided on the mounting frame 51. The structure of the positioning mechanism 10 is exactly the same as that of the adjustment mechanism 11; it includes components such as a sliding sleeve 103, one end of the positioning member 5 is connected to the sliding sleeve 103, and the other end is screwed to the fixing rod 111 through a support plate 105, so that the positioning member 101 can slide back and forth with the sliding seat 112.

[0037] Furthermore, in order to facilitate the picking of materials, the frame is provided with a material carrier 8 located in front of the supporting mechanism, and the material carrier 8 can be used to place materials to be processed, such as cushions, seat plates 1, or chair seats that have completed the positioning step but not the tightening step; in order not to interfere with the chair seat placed on the supporting mechanism, the material carrier 8 is provided with an avoidance area 81 for avoiding the chair seat at one end facing the supporting mechanism.

[0038] Furthermore, a roller 53 is connected to the bottom end of the frame 5, and the design of the roller 53 is convenient for carrying the seat forming device and moving the seat forming station.

[0039] The present invention and its embodiments are described schematically above, and the description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by it and designs a structural method and an embodiment similar to the technical solution without creativity without departing from the purpose of the invention, they shall all fall within the protection scope of the present invention.

Claims

1. A molding process for a chair seat, characterized in that: The following steps are involved: S1: a pre-set seat plate (1) and a seat cushion; the seat comprises a seat plate (1) and a seat cushion adapted to the shape of the seat plate (1), the outer contour area of ​​the seat cushion being larger than the outer contour area of ​​the seat plate (1); the seat cushion comprises a soft cushion (2) and a covering cloth (3) covering the soft cushion (2), a pull cord (31) being connected around the outer periphery of the covering cloth (3), and two ends of the pull cord (31) being exposed outside the covering cloth (3) and forming two pulling sections (32); S2: Positioning; placing a seat cushion on the front side of the seat plate (1) so that the seat cushion forms an annular connecting portion (4) extending outward from the seat plate (1); then folding the annular connecting portions (4) on opposite sides of the seat plate (1) toward the back side of the seat plate (1) and fixing them to the seat plate (1) by means of nails (4a), thereby dividing the annular positioning portion (41) into two positioning portions (41) fixed on the back side of the seat plate (1) and two side connecting portions (42) not connected to the seat plate (1); S3: Flanging; laying the seat flat with the back of the seat plate (1) facing upwards, and then applying an external force downwards to the middle of the back of the seat plate (1) to deform the seat cushion, and at the same time causing the two side connecting parts (42) to be flanged toward the inner side of the back of the seat plate (1); S4: tightening; the two pulling sections (32) are tightened by external force, so that the two side connecting parts (42) are tightened and fit on the inner side of the back of the seat plate (1), thereby combining the seat cushion and the seat plate (1) into an integral seat.

2. The molding process of a chair seat according to claim 1, characterized in that: In step S4, the pulling sections (32) of the two tightened pull ropes (31) are attached to the annular connecting portion (4) and fixed to the seat plate (1) by means of nails (4a).

3. The molding process of a chair seat according to claim 1, characterized in that: In step S3, the seat is placed on a seat forming device, the seat forming device comprising a frame (5), the frame (5) being connected with a bearing mechanism for supporting the seat, and a press-fitting assembly (7) located directly above the bearing mechanism, the press-fitting assembly (7) comprising a first driving member (72) and a pressing head (71) connected to the first driving member (72), the first driving member (72) being capable of driving the pressing head (71) to move up and down; in step S3, the first driving member (72) drives the pressing head (71) to move downward and acts on the middle position of the back side of the seat plate (1) to deform the seat cushion, so as to cause the two side connecting parts (42) to be turned toward the inner position of the back side of the seat plate (1).

4. The molding process of a chair seat according to claim 3 is characterized in that: The first driving member (72) is a cylinder that can be extended upward and downward, and has a first piston rod (721) that can be extended upward and downward in the cylinder. The pressure head (71) and the bottom end of the first piston rod (721) are threadedly connected and locked by a nut (73). In step S3, the force of the pressure head (71) on the seat plate (1) can be adjusted by changing the thread matching length of the first piston rod (721) and the pressure head (71) and then locking them by the nut (73).

5. The molding process of a chair seat according to claim 3 is characterized in that: An auxiliary profiling member (6) is connected to the bearing mechanism, and the auxiliary profiling member (6) has a mold groove (61) with an open upper end, and the contour shape and size of the mold groove (61) match the shape and size of the outer contour of the seat plate (1); in step S3, the seat cushion of the chair is placed on the upper end of the auxiliary profiling member (6) with the seat facing downward, and when the pressure head (71) acts downward on the middle position of the back of the seat plate (1), the seat cushion sinks downward into the mold groove (61), and the outer peripheral edge of the seat plate (1) and the side wall of the mold groove (61) act on the inner and outer sides of the side connecting portion (42) respectively, so as to form a guide for the side connecting portion (42) to be flanging toward the back of the seat plate (1).

6. The molding process of a chair seat according to claim 3 is characterized by: The seat forming device also includes a wire pulling mechanism (9) symmetrically arranged on both sides of the supporting mechanism, the wire pulling mechanism (9) includes a second driving member (92) and a tensioner (93) connected to the second driving member (92); the second driving member (92) can drive the tensioner (93) to move left and right; in step S4, the two pulling sections (32) of the pull rope (31) are first connected to the tensioner (93), and then the tensioner (93) moves in the left and right directions under the action of the second driving member (92) and tightens the pulling section (32), so that the side connection part (42) is tightened and fits against the inner side of the back of the seat plate (1).

7. The molding process of a chair seat according to claim 6, characterized in that: The wire pulling mechanism (9) further comprises a bracket (91) for mounting a second driving member (92), the bracket (91) being symmetrically arranged on the left and right sides of the bearing mechanism, and in step S4, the bracket (91) can be rotated forward and backward and stopped at a corresponding position to adapt to the extension direction of the pulling section (32).

8. The molding process of a chair seat according to claim 7, characterized in that: The bracket (91) rotates forward and backward along an arc-shaped trajectory, and a plurality of waist-shaped grooves (911) extending along the arc-shaped rotation trajectory are provided on the bracket (91), and a plurality of screw holes (122a) corresponding to the positions of the waist-shaped grooves (911) are provided on the supporting mechanism. In step S4, after the bracket (91) rotates forward and backward to a certain position, a corresponding screw passes through each waist-shaped groove (911) and is screwed into the screw hole (122a) to lock the bracket (91) on the supporting mechanism, so that the bracket (91) that has rotated to a certain position stays at a corresponding position.

9. The molding process of a chair seat according to claim 3, characterized in that: The bearing mechanism comprises a bottom plate (12), wherein a first support plate (121) and a second support plate (122) spaced apart from each other are provided at the upper end of the bottom plate (12), and the second support plate (122) can slide forward and backward on the bottom plate (12); in step S3, the second support plate (122) can slide forward and backward and change the distance between the second support plate (122) and the first support plate (121) to adapt to the front-to-back width of the seat.

10. The molding process of a chair seat according to claim 3, characterized in that: A sliding seat (112) capable of sliding forward and backward is connected to the frame (5) of the seat forming device, and the sliding seat (112) is connected to the bottom end of the supporting mechanism via a column. In step S3, the sliding seat (112) can slide forward and backward and then stop at a corresponding position, so that the middle position of the back side of the seat plate (1) is aligned with the pressure head (71).

11. The molding process of a chair seat according to claim 10, characterized in that: The upright column is a telescopic rod that can be lifted up and down. In step S3, the telescopic rod can be lifted up and down to adjust the distance between the seat and the pressure head (71) to the desired position.

12. The molding process of a chair seat according to claim 11, characterized in that: The telescopic rod comprises a fixed rod (111), a movable rod (111a) that rises and falls relative to the fixed rod (111), the movable rod (111a) and the fixed rod (111) being connected to a bearing mechanism and a sliding seat (112) respectively; a positioning member (101) that can slide laterally is connected to the frame (5), and the positioning member (101) is connected to the fixed rod (111); in step S3, when the sliding seat (112) slides forward and backward into position, the positioning member (101) can slide laterally with the sliding seat (112) and stay at a corresponding position, so as to form a transverse positioning for the telescopic rod.

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