Mesh chair frame stretching equipment

Abstract

The present invention discloses a mesh stretching device for a mesh chair frame, comprising a workbench, a lifting device, a deformation device, a placement device, and a covering device; wherein the placement device comprises a positioning die, the positioning die being mounted on the workbench, the top of the positioning die being provided with a placement slot matching the mesh chair frame; the lifting device being capable of driving the mesh chair frame in and out of the discharge slot; the deformation device being capable of fixing the mesh chair frame from multiple directions and being capable of driving the mesh chair frame to deform; and the covering device being capable of pulling both ends of a steel wire rope extending from the stretching net so that the stretching net wraps around the mesh chair frame. This device can meet the assembly requirements of mesh chair frames and stretching nets of different specifications, reduce the difficulty of wrapping the stretching net on the mesh chair frame, and improve the installation efficiency of the stretching net and the mesh chair frame.

Description

Technical Field

[0001] The present invention relates to the field of home furnishings, and in particular to a mesh stretching device for a mesh chair frame. Background Art

[0002] In the prior art, during the production process of mesh chairs, it is necessary to manually tighten the mesh, and then use a nail gun to nail the edges of the mesh to the mesh chair frame along the edges of the mesh chair frame; however, this working method is not only inefficient, but also due to limited manpower, the supporting effect of the mesh is often unsatisfactory, and the edges of the mesh are irregular, which affects the overall image of the chair. Moreover, if the installation position of the mesh deviates greatly, rework is required, especially for leather fabrics, which results in a large cost loss.

[0003] Patent document with publication number CN112932139A discloses a chair and a device and method for installing fabric on a chair frame. The specification discloses a method for installing fabric on a chair frame, and the specific steps are as follows: Step 1: Install a steel wire rope on the fabric and form a circle along the edge of the fabric; Step 2: Place the chair frame in the center of the workbench and preliminarily install the fabric on the chair frame; Step 3: Clamp the left and right sides of the chair frame by two pressing components and force the chair frame to produce pre-deformation; Step 4: Wrap the steel wire rope around the outer wall of the chair frame by two stretching components at least once, and make a first component at least partially enter the second sub-channel; and another first component at least partially enter the third sub-channel; Step 5: The stretching component releases the steel wire rope, and then the pressing component releases the chair frame so that the chair frame rebounds, thereby forcing the first component in the second sub-channel to press against the step surface between the first sub-channel and the second sub-channel; and the first component in the third sub-channel to press against the step surface between the third sub-channel and the fourth sub-channel.

[0004] The following problems exist in the existing technology: 1) The chair frame is not completely fixed before the fabric is installed, so when the chair frame is deformed, the chair frame may move and jump upward; 2) Before the chair is deformed, the fabric needs to be preliminarily installed on the chair frame, so that the two clamping components force the chair frame to press against the part of the fabric pre-installed on the chair frame when it is deformed, which will affect the degree of tension of the fabric and directly affect the supporting strength of the fabric, reducing the user experience; 3) The wire rope is wrapped around the outer wall of the chair frame, which requires the wire rope to be tightened on the side wall of the chair frame, which places higher requirements on the stretching component that pulls the wire rope to move, and because the clamping component presses against part of the fabric, this will inevitably affect the tightening strength of the wire rope. Summary of the Invention

[0005] In order to solve the problems in the prior art, the purpose of the present invention is to provide a mesh stretching device for a mesh chair frame, which can meet the assembly requirements of mesh chair frames and stretching nets of different specifications, reduce the difficulty of covering the stretching net on the mesh chair frame, and improve the installation efficiency of the stretching net and the mesh chair frame.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions: a mesh chair frame stretching device includes a workbench, a lifting device, a deformation device, a placement device and a covering device; wherein, the placement device includes a positioning mold, the positioning mold is installed on the workbench, and a placement slot is provided on the top of the positioning mold; the lifting device includes a first cylinder, a first bracket and a second bracket, the first bracket is fixed on the workbench, the first cylinder is installed on the first bracket, the second bracket is installed on the telescopic end of the first cylinder, and the second bracket is located above the positioning mold; the deformation device includes a front positioning plate, a rear positioning plate and a fourth connecting plate, the front positioning plate The plate and the rear positioning plate are arranged front and back, the front positioning plate is installed on the second bracket in a manner that it can slide back and forth, the rear positioning plate is fixed on the second bracket, the fourth connecting plate is located between the front positioning plate and the rear positioning plate, and the fourth connecting plate is installed on the second bracket in a manner that it can move up and down; the front positioning plate and the rear positioning plate can support the front and rear ends of the net chair frame from the bottom to the top, and the fourth connecting plate can press the left and right ends of the net chair frame from the top to the bottom to deform the net chair frame; the covering device includes a first pulling cylinder and a second pulling cylinder, the first pulling cylinder and the second pulling cylinder can respectively pull the two ends of the steel wire rope extending from the tension net, so that the tension net wraps the net chair frame.

[0007] Preferably, a front support portion protrudes forward on the front positioning plate, and a rear support portion protrudes backward on the rear positioning plate.

[0008] Preferably, the front positioning plate includes a first front positioning plate and a second front positioning plate, the first front positioning plate and the second front positioning plate are symmetrically arranged, and the rear positioning plate is located behind the middle position of the first front positioning plate and the second front positioning plate.

[0009] Preferably, a first fixing plate and a second fixing plate are fixed on the second bracket, the first fixing plate and the first front positioning plate are arranged front and back, the second fixing plate and the second front positioning plate are arranged front and back, a first guide column is fixed on the first front positioning plate, the first guide column is slidably connected to the first fixing plate, a second guide column is fixed on the second front positioning plate, and the second guide column is slidably connected to the second fixing plate.

[0010] Preferably, a first return spring is sleeved on the first guide column, and the two ends of the first return spring are respectively against the first front positioning plate and the first fixed plate; the second guide column is sleeved on the second return spring, and the two ends of the second return spring are respectively against the second front positioning plate and the second fixed plate.

[0011] Preferably, the deformation device further comprises a second cylinder, a cylinder body of the second cylinder is fixed on the second bracket, and a telescopic end of the second cylinder is connected to the middle position of the fourth connecting plate.

[0012] Preferably, the deformation assembly further includes a first pressing block and a second pressing block, the first pressing block and the second pressing block are arranged on the left and right, and the first pressing block and the second pressing block are both slidably mounted on the fourth connecting plate.

[0013] Preferably, the covering device includes two first pulling blocks and a second pulling block, the first pulling block is fixed on the telescopic end of the first pulling cylinder, and the second pulling block is fixed on the telescopic end of the second pulling cylinder, the first pulling block is provided with a first pulling hole matching the end of the steel wire rope, and the second pulling block is provided with a second pulling hole matching the end of the steel wire rope.

[0014] Preferably, the covering device has two guide wheels, which are located between the first drawer block and the second drawer block, and the positions of the guide wheels are lower than the lowest points of the telescopic ends of the first drawer block and the second drawer block.

[0015] Preferably, the placement device includes a positioning box, which is fixedly mounted on the top of the workbench. The positioning box is provided with a placement cavity opening upward, and the contour of the positioning mold is consistent with the contour of the placement cavity.

[0016] The beneficial effects of the technical solution of the present invention are as follows: when the mesh chair frame is installed on the device, the distance between the front positioning plate and the rear positioning plate is adjusted so that the front positioning plate and the rear positioning plate are inserted into the interior of the mesh chair frame, so that the front positioning plate and the rear positioning plate fix the front and rear ends of the mesh chair frame, and then the left and right ends of the mesh chair frame are pressed down by the fourth connecting plate to deform the mesh chair frame, so that the mesh chair frame is restricted in six directions, such as up, down, left, right, front and back, and mesh chair frames of different specifications can be installed on the device. At the same time, due to the different specifications of the stretched net, the length of the steel wire rope passed through the stretched net is different, but the device can match the steel wire ropes of different lengths by controlling the stroke of the cylinder, so that different models of mesh chairs and frames at different positions on the mesh chair can be assembled through the device. , which makes the present invention extremely versatile and adaptable, and is convenient for assembling mesh chair frames and nets of various specifications and shapes; and the positioning device is in point contact with the mesh chair frame and drives the mesh chair frame to deform, while the placement groove of the positioning mold is in surface contact with the mesh chair frame to deform the entire frame, so that the assembled mesh chair frame better meets the design requirements; and the hollow positioning mold can effectively reduce the friction suffered by the net from the mesh chair frame and the positioning mold, so that the net can be more easily moved between the net frame and the net during the tightening process, so that the net installed on the mesh chair frame can be tightened and have a better supporting effect; through the above-mentioned equipment, there is no need to pre-install the net on the mesh chair frame, which reduces the installation steps of the mesh chair frame and improves the installation efficiency of the mesh chair frame and the net. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural diagram of the mesh stretching equipment for a mesh chair frame;

[0018] Figure 2 Schematic diagram of the connection structure between the deformation device and the covering device;

[0019] Figure 3 Schematic diagram of the connection structure between the second bracket and the deformation device Figure 1 ;

[0020] Figure 4 Schematic diagram of the connection structure between the second bracket and the deformation device Figure 1 ;

[0021] Figure 5 Schematic diagram of the connection structure between the second bracket and the deformation device Figure 1 ;

[0022] Figure 6 is a structural diagram of the first pulling cylinder (retracted state);

[0023] Figure 7 is a structural diagram of the second pulling cylinder (in extended state);

[0024] Figure 8 Schematic diagram of the structure of the second pull-out block;

[0025] Figure 9 It is a schematic diagram of the connection structure between the positioning mold and the mesh chair frame;

[0026] Figure 10 It is a structural diagram of the positioning mold;

[0027] Figure 11 Schematic diagram of the structure of the mesh chair frame Figure 1 ;

[0028] Figure 12 Schematic diagram of the structure of the mesh chair frame Figure 2 ;

[0029] Figure 13 Schematic diagram of the structure of the wire rope;

[0030] Figure 14 It is a structural diagram of the stretched net.

[0031] Reference numerals: 1, workbench; 11, first bracket; 2, first cylinder; 21, first mounting plate; 22, second bracket; 23, fourth guide post; 3, second mounting plate; 31, ninth connecting plate; 32, first positioning hole; 33, second positioning hole; 34, mounting portion; 40, second connecting plate; 41, first pressure block; 411, first limiting portion; 412, seventh connecting plate; 42, second pressure block; 421, second limiting portion; 42 2. Eighth connecting plate; 43. First front positioning plate; 431. First front positioning portion; 432. First fixing plate; 433. First guide post; 44. Second front positioning plate; 441. Second front positioning portion; 442. Second fixing plate; 443. Second guide post; 45. Rear positioning plate; 451. Rear positioning portion; 452. Third connecting plate; 46. Second cylinder; 462. First mounting seat; 47. Fourth connecting plate; 471. Third positioning hole ; 472, fourth positioning hole; 48, third guide post; 49, first connecting plate; 51, first pulling cylinder; 512, fourth mounting seat; 52, first pulling block; 521, first pulling hole; 53, second pulling cylinder; 532, fifth mounting seat; 54, second pulling block; 541, second pulling hole; 5411, second driving part; 5412, second avoidance part; 55, sixth connecting plate; 56, first guide wheel; 57, first Second guide wheel; 58, third mounting seat; 59, third mounting plate; 6, mesh chair frame; 61, first supporting part; 62, second supporting part; 63, third supporting part; 64, fourth supporting part; 65, first protrusion; 66, second protrusion; 67, mounting surface; 68, supporting surface; 69, positioning box; 7, positioning mold; 71, placement slot; 8, electric control box; 9, mesh; 91, mesh body; 92, wire rope; 93, limit block. DETAILED DESCRIPTION

[0032] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are 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, and therefore should not be understood as limiting the present invention.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more, unless otherwise explicitly specified.

[0035] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0036] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0037] The orientations described in the following embodiments are Figure 1 shall prevail. Figure 1 In the middle, the position of the first cylinder is the top, the position of the workbench is the back, the position of the electric control cabinet is the left, and the side opposite to the electric control cabinet is the right, and then the front and back are discussed.

[0038] Example

[0039] like Figure 1-13 As shown, the mesh chair frame stretching equipment includes a workbench 1, a lifting device, a deformation device, a placement device and a covering device; wherein, the placement device includes a positioning mold 7, the positioning mold 7 is installed on the workbench 1, and the top of the positioning mold 7 is provided with a placement groove 71, the central position of the placement groove 71 is recessed downward to make the positioning mold 7 hollow; the lifting device includes a first cylinder 2, a first bracket 11 and a second bracket 22, the first bracket 11 is fixed on the workbench 1, the first cylinder 2 is installed on the first bracket 11, the second bracket 22 is installed on the telescopic end of the first cylinder 2, and the second bracket 22 is located above the positioning mold 7; the deformation device includes a front positioning plate, a rear positioning plate 45 and a fourth connecting plate 47, the front positioning plate The positioning plate and the rear positioning plate 45 are arranged front and back, the front positioning plate is installed on the second bracket 22 in a manner that it can slide back and forth, the rear positioning plate 45 is fixed on the second bracket 22, the fourth connecting plate 47 is located between the front positioning plate and the rear positioning plate 45, and the fourth connecting plate 47 is installed on the second bracket 22 in a manner that it can move up and down; the front positioning plate and the rear positioning plate 45 can support the front and rear ends of the net chair frame from the bottom to the top, and the fourth connecting plate 47 can press the left and right ends of the net chair frame from the top to the bottom to deform the frame; the covering device includes a first pulling cylinder 51 and a second pulling cylinder 53, the first pulling cylinder 51 and the second pulling cylinder 53 can respectively pull the two ends of the steel wire rope 92 extending from the tension net 9, so that the tension net 9 wraps the net chair frame 6.

[0040] With such arrangement, when the net chair frame 6 is installed on the device, the distance between the front positioning plate and the rear positioning plate 45 is adjusted so that the front positioning plate and the rear positioning plate 45 are inserted into the interior of the net chair frame 6, so that the front positioning plate and the rear positioning plate 45 fix the front and rear ends of the net chair frame 6, and then the left and right ends of the net chair frame 6 are pressed down by the fourth connecting plate 47 to deform the net chair frame 6, so that net chair frames 6 of different specifications can be installed on the device. At the same time, due to the different specifications of the tensioning net 9, the lengths of the steel wire ropes 92 passed through the tensioning net 9 are different. However, the device can match the steel wire ropes 92 of different lengths by controlling the stroke of the cylinder, so that different models of net chairs and frames at different positions on the net chair can be assembled through the device, so that the present invention has extremely strong versatility and adaptability, and is convenient for assembling net chair frames 6 and tensioning nets 9 of various specifications and shapes.

[0041] In this embodiment, Figure 1 As shown, a first mounting plate 21 is fixedly mounted on the top of the first bracket 11, the first cylinder 2 is arranged vertically, the cylinder body of the first cylinder 2 is fixed to the first mounting plate 21, the telescopic rod of the first cylinder 2 is arranged downward, and the telescopic rod of the first cylinder 2 is inserted into and fixedly connected to the second bracket 22. To ensure the stability of the vertical movement between the second bracket 22, the second bracket 22 is connected to the first mounting plate 21 by multiple fourth guide posts 23, and the multiple fourth guide posts 23 are evenly mounted on the second bracket 22. This arrangement prevents rotation and shaking of the second bracket 22 during the lifting movement, improving the stability of the assembly.

[0042] like Figure 2-5 As shown, the deformation device includes a positioning assembly and a deformation assembly, the positioning assembly is used to support the mesh chair frame 6, and the deformation assembly is used to drive the mesh chair frame 6 to deform. The positioning assembly includes a front positioning plate and a rear positioning plate, the front positioning plate includes a first front positioning plate 43, a second front positioning plate 44 and a rear positioning plate 45, the rear positioning plate 45 is fixedly mounted on the second bracket 22, the bottom of the rear positioning plate 45 protrudes backward with a rear positioning portion 451, the first front positioning plate 43 and the second front positioning plate 44 can both be slidably mounted on the second bracket 22, the first front positioning plate 43 and the second front positioning plate 44 are both located in front of the rear positioning plate 45, the first front positioning plate 43 and the second front positioning plate 44 are symmetrically arranged, the bottom of the first front positioning plate 43 protrudes forward with a first front positioning portion 431, and the bottom of the second front positioning plate 44 protrudes forward with a second front positioning portion 441. Such arrangement enables the first front positioning plate 43, the second front positioning plate 44 and the rear positioning plate 45 to form a stable triangular structure, so that the supported mesh chair frame 6 remains stable, and the slidable first front positioning plate 43 and the second front positioning plate 44 can match more specifications.

[0043] In order to facilitate the installation of the positioning component, in this embodiment, Figure 2-5 As shown, the device also includes a second mounting plate 3, which has two mounting portions 34 protruding thereon, and the tops of the two mounting portions 34 are fixedly connected to the ninth connecting plate 31; the top of the ninth connecting plate 31 is fixed to the bottom of the second bracket 22, and the ninth connecting plate 31 extends in the front and rear directions to facilitate the installation of the deformation device and the covering device, and the first front positioning plate 43, the second front positioning plate 44 and the rear positioning plate 45 are all installed below the second mounting plate 3.

[0044] In this embodiment, Figure 2-5As shown, the positioning assembly also includes a first fixing plate 432 and a second fixing plate 442, and the first fixing plate 432 and the second fixing plate 442 are both slidably mounted on the second mounting plate 3, the first fixing plate 432 is located on the rear side of the first front positioning plate 43, and the second fixing plate 442 is located on the rear side of the second front positioning plate 44, the first front positioning plate 43 and the first fixing plate 432 are slidably connected through a plurality of first guide columns 433, and the second front positioning plate 44 is slidably connected to the second fixing plate 442 through a plurality of second guide columns 443. Furthermore, there are two first guide posts 433, which are arranged up and down, and the front ends of the two first guide posts 433 are fixedly connected to the rear end of the first front positioning plate 43, and the first guide post 433 extends backward and passes through the first guide sleeve installed on the first fixing plate 432, and the first guide post 433 and the first guide sleeve slide together, so that the first front positioning plate 43 and the first fixing plate 432 are slidingly connected; there are two second guide posts 443, which are arranged up and down, and the front ends of the two second guide posts 443 are fixedly connected to the rear end of the second front positioning plate 44, and the second guide post 443 extends backward and passes through the second guide sleeve installed on the second fixing plate 442, and the second guide post 443 and the second guide sleeve slide together, so that the second front positioning plate 44 and the second fixing plate 442 are slidingly connected. Further preferably, the two first guide pillars 433 are each provided with a first return spring, the first return spring is located between the first front positioning plate 43 and the first fixed plate 432, and the front and rear ends of the first return spring are respectively against the first front positioning plate 43 and the first fixed plate 432; the two second guide pillars 443 are each provided with a second return spring, the second return spring is located between the second front positioning plate 44 and the second fixed plate 442, and the front and rear ends of the second return spring are respectively against the second front positioning plate 44 and the second fixed plate 442. In this way, after the net chair frame is installed on the first front positioning plate 43, the second front positioning plate 44 and the rear positioning plate 45, the first front positioning plate 43 and the second front positioning plate 44 can automatically reset, so that the net chair frame 6 can be hung on the positioning assembly, and because the first front positioning plate 43 and the second front positioning plate 44 are symmetrically arranged on both sides of the rear positioning plate 45, an isosceles triangle positioning path is formed between the first front positioning plate 43, the second front positioning plate 44 and the rear positioning plate 45, which can ensure that the posture of the same type of net chair frame 6 on the positioning assembly remains consistent, thereby maintaining product consistency and reducing the probability of failure in assembly of the net chair frame 6 and the stretch net 9.

[0045] In order to make the two front positioning plates move in unison, Figure 4 and Figure 5As shown, in this embodiment, the first front positioning plate 43 and the second front positioning plate 44 are fixedly connected by the first connecting plate 49. In this way, when the net chair frame 6 is installed on the positioning assembly, the first connecting plate 49 can be directly pushed to drive the first front positioning plate 43 and the second front positioning plate 44 to move backward, and the moving distance of the first front positioning plate 43 and the second front positioning is always consistent.

[0046] In order to facilitate the adjustment of the distance between the first front positioning plate 43 and the second front positioning plate 44, in this embodiment, as shown in FIG. Figure 4 As shown, the positioning assembly also includes a second connecting plate 40, the first fixing plate 432 and the second fixing plate 442 are fixedly connected through the second connecting plate 40, the second connecting plate 40 is on the second mounting plate 3 in a manner that can slide back and forth, and a plurality of first connecting holes are opened on the second connecting plate 40, and the first fixing plate 432 and the second fixing plate 442 can be connected to the first connecting holes located at different positions by fasteners such as bolts or positioning pins, so that the distance between the first front positioning plate 43 and the second front positioning plate 44 can be adjusted according to the size of the product.

[0047] In order to facilitate the adjustment of the height of the rear positioning plate 45, in this embodiment, Figure 3 、 Figure 4 and Figure 5 As shown, a third connecting plate 452 is installed under the second mounting plate 3, and a plurality of second connecting holes are provided on the third connecting plate 452, and the plurality of second connecting holes are divided into two columns set on the left and right. A plurality of third connecting holes are provided on the rear positioning plate 45, and the plurality of third connecting holes are divided into two columns set on the left and right. With such an arrangement, when installing the rear positioning plate 45, the third connecting holes on the rear fixing plate can be matched with the second connecting holes at different positions on the third connecting plate 452, and then fasteners such as bolts and positioning pins can be inserted into the second and third connecting holes to fix the rear positioning plate 45 on the third connecting plate 452.

[0048] In order to make the positioning assembly compatible with more specifications of the mesh chair frame 6, in this embodiment, Figure 5As shown, the second mounting plate 3 is provided with a first positioning hole 32 and a second positioning hole 33, and the first positioning hole 32 is located in front of the second positioning hole 33, and the first positioning hole 32 and the second positioning hole 33 are both waist-shaped holes extending forward and backward; when installing the second connecting plate 40 and the third connecting plate 452, bolts can be used to fix the second connecting plate 40 and the third connecting plate 452 on the second mounting plate 3, specifically, the threaded section of the bolt passes through the first positioning hole 32 and is threadedly connected to the second connecting plate 40, and the threaded section of the bolt passes through the second positioning hole 33 and is threadedly connected to the third connecting plate 452, and then, the spacing between the second connecting plate 40 and the third connecting plate 452 is adjusted. When the spacing between the second connecting plate 40 and the third connecting plate 452 is determined, the bolts are tightened to fix the second connecting plate 40 and the third connecting plate 452 on the second mounting plate 3.

[0049] In this embodiment, Figure 2-5 As shown, the deformation assembly includes a second cylinder 46, a first pressure block 41 and a second pressure block 42. The cylinder body of the second cylinder 46 is fixed to the bottom of the second mounting plate 3. The telescopic rod of the second cylinder 46 is set downward. The middle position of the fourth connecting plate 47 is fixedly connected to the bottom of the telescopic rod of the second cylinder 46. The first pressure block 41 and the second pressure block 42 are both slidably mounted on the fourth connecting plate 47. The first pressure block 41 and the second pressure block 42 are symmetrically arranged on the left and right. The telescopic second cylinder 46 can drive the fourth connecting plate 47 to move up and down and then simultaneously suppress the left and right ends of the net chair frame 6 through the first pressure block 41 and the second pressure block 42, so that the net chair frame 6 is deformed. Further preferably, as Figure 4 and Figure 5As shown, to further stabilize the movement of the fourth connecting plate 47, the deformation assembly further includes two first mounting blocks 462, two third guide posts 48, and two third guide sleeves. The two first mounting blocks 462 are disposed on the left and right sides and fixed to the second mounting plate 3. The two guide sleeves are respectively fixed to the two first mounting blocks 462. The two third guide posts 48 are disposed on the left and right sides. The second cylinder 46 is located between the two third guide posts 48. The bottom of the third guide post 48 is fixedly connected to the fourth connecting plate 47. The third guide post 48 extends vertically upward through the third guide sleeves and slides in engagement. This arrangement limits the movement of the fourth connecting plate 47 by the third guide posts 48 and the third guide sleeves, preventing the fourth connecting plate 47 from rotating. Furthermore, the bottom of the telescopic rod of the second cylinder 46 is fixed to the middle of the fourth connecting plate 47, and the two third guide posts 48 are disposed on either side of the second cylinder 46. This ensures stable lifting and lowering of the third connecting plate 452 and more uniform force exerted by the fourth connecting plate 47 on the chair frame. Further preferably, positioning blocks are fixedly installed on the top of the two third guide columns 48, and the positioning blocks are located above the first mounting seat 462. Such a setting can limit the lifting and lowering stroke of the fourth connecting plate 47, thereby preventing the fourth connecting plate 47 from being too low and affecting the strength of the mesh chair frame 6.

[0050] In this embodiment, a first stopper 411 protrudes downward from the bottom of the first pressing block 41, and a second stopper 421 protrudes downward from the bottom of the second pressing block 42. The distance between the first stopper 411 and the second stopper 421 is no less than the horizontal length of the net chair frame 6. This allows the left and right ends of the net chair frame 6 to be restrained between the first pressing block 41 and the second pressing block 42. The front and rear ends of the net chair frame 6 are restrained by the front and rear positioning plates 45. This ensures that the net chair frame 6 is positioned in all six directions: front, back, left, right, up, and down, allowing the net chair frame 6 to be more stably installed on the equipment.

[0051] More preferably, Figures 3 to 5As shown, the fourth connecting plate 47 is provided with a third positioning hole 471 and a fourth positioning hole 472. The seventh connecting plate 412 is fixedly mounted on the top of the first pressing block 41, and the eighth connecting plate 422 is fixedly mounted on the top of the second pressing block 42. The third positioning hole 471 is located above the seventh connecting plate 412, and the fourth positioning hole 472 is located above the eighth connecting plate 422. When installing the first pressing block 41, a bolt is passed through the third positioning hole 471 and then threadedly connected to the seventh connecting plate 412. A bolt is passed through the fourth positioning hole 472 and then threadedly connected to the eighth connecting plate 422. After adjusting the relative positions of the first pressing block 41 and the second pressing block 42, the bolts on the seventh connecting plate 412 and the bolts on the eighth connecting plate 422 are tightened. In this way, the relative positions of the first pressing block 41 and the second pressing block 42, as well as the positions of the first pressing block 41 and the second pressing block 42 on the fourth connecting plate 47, can be adjusted, allowing the device to better match a variety of mesh chair frames 6. More preferably, there are two third positioning holes 471 arranged in the front-to-back direction, two fourth positioning holes 472 arranged in the front-to-back direction, two seventh connecting plates 412 arranged in the front-to-back direction, and two eighth connecting plates 422 arranged in the front-to-back direction. This can limit the angle between the first pressing block 41 and the second pressing block 42, so that the first pressing block 41 and the second pressing block 42 are arranged facing each other.

[0052] In this embodiment, Figure 1 、 Figure 2 、 Figure 3 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 and Figure 10 As shown, the covering device includes a first guide wheel 56 and a second guide wheel 57, the first pulling cylinder 51 and the second pulling cylinder 53 are symmetrically arranged on the left and right and are installed on the second mounting plate 3, the first guide wheel 56 and the second guide wheel 57 are symmetrically arranged on the left and right and are both installed on the second mounting plate 3, the first guide wheel 56 and the second guide wheel 57 are located between the first pulling cylinder 51 and the second pulling cylinder 53, the first guide wheel 56 is close to the first pulling cylinder 51, and the second guide wheel 57 is close to the second pulling cylinder 53, the telescopic end of the first pulling cylinder 51 is provided with a first pulling hole 521 that matches the installation at one end of the steel wire rope 92, and the telescopic end of the second pulling cylinder 53 is provided with a second pulling hole 541 that matches the installation at the other end of the steel wire rope 92, the lowest point of the moving stroke of the first pulling cylinder 51 is higher than the lowest point of the first guide wheel 56, and the lowest point of the moving stroke of the second pulling cylinder 53 is higher than the lowest point of the second guide wheel 57.

[0053] More preferably, Figures 2 to 9As shown, a fourth mounting seat 512 and a fifth mounting seat 532 are fixedly mounted on the second mounting plate 3. The fourth mounting seat 512 and the fifth mounting seat 532 are symmetrically arranged and fixed to the left and right ends of the second mounting plate 3, respectively. The fourth mounting seat 512 and the fifth mounting seat 532 are both provided with inclined surfaces. The cylinder body of the first pulling cylinder 51 is fixed to the inclined surface of the fourth mounting seat 512, and the cylinder body of the second pulling cylinder 53 is fixed to the inclined surface of the fifth mounting seat 532. In this way, the first pulling cylinder 51 and the second pulling cylinder 53 are both inclined. The center position of the outer circumference of the first guide wheel 56 is concave inward, and the center position of the outer circumference of the second guide wheel 57 is concave inward. In this way, the concave positions of the first guide wheel 56 and the second guide wheel 57 can limit the extension direction of the wire rope 92, thereby improving the stability of the pulling wire.

[0054] Further preferably, a slidable third mounting plate 59 is installed above the second mounting plate, and a fourth mounting plate and a fifth mounting plate are fixedly installed on the left and right ends of the third mounting plate 59, respectively. The fourth mounting plate is fixedly connected to the fourth mounting seat 512, and the fourth and fifth mounting plates are fixedly connected to the fifth mounting seat 532. Such an arrangement allows the first pulling cylinder and the second pulling cylinder to move back and forth synchronously, and adjust the positions of the first pulling cylinder and the second pulling cylinder on the second mounting plate. Specifically, a seventh positioning hole 591 is provided on the third mounting plate 59. The seventh positioning hole 591 is a waist-shaped hole extending in the front-to-back direction. When installing the third mounting plate, the thread of the bolt is continuously passed through the seventh positioning hole 591 and then threadedly connected to the top of the second mounting plate 3. When the position adjustment is completed, the bolt is tightened to fix the second mounting plate and the third mounting plate.

[0055] Further preferably, a second mounting seat and a third mounting seat 58 are fixedly mounted on the second mounting plate 3, the second mounting seat and the third mounting seat 58 are symmetrically arranged, and the second mounting seat and the third mounting seat 58 are located between the first pulling cylinder 51 and the second pulling cylinder 53. A fifth connecting plate that can be raised and lowered is mounted on the second mounting seat, and a sixth connecting plate 55 that can be raised and lowered is mounted on the third mounting seat 58. The fifth connecting plate and the sixth connecting plate 55 are both arranged vertically, and the first guide wheel 56 is rotatably mounted on the bottom of the fifth connecting plate, and the second guide wheel 57 is rotatably mounted on the bottom of the sixth connecting plate 55. With such an arrangement, the height of the first guide wheel 56 and the second guide wheel 57 can be adjusted, which not only allows the tensioning mesh 9 of different specifications to be matched, but also allows the tightness of the tensioning mesh 9 to be adjusted.

[0056] Further preferably, the second mounting seat is provided with a first vertically arranged sliding groove, the upper portion of the fifth connecting plate is located in the first sliding groove and is slidably connected thereto, the fifth connecting plate is provided with a fifth vertically extending positioning hole, and when the fifth connecting plate is installed, a bolt is passed through the fifth connecting hole and is threadedly connected to the second mounting seat; the third mounting seat 58 is provided with a second vertically arranged sliding groove, the upper portion of the sixth connecting plate 55 is located in the second sliding groove and is slidably connected thereto, the sixth connecting plate 55 is provided with a sixth vertically extending positioning hole, and when the sixth connecting plate 55 is installed, a bolt is passed through the sixth connecting hole and is threadedly connected to the third mounting seat 58. With this arrangement, the height of the first guide wheel 56 and the second guide wheel 57 can be adjusted simply by loosening or tightening the bolts on the second and third mounting seats 58.

[0057] Further preferably, the fifth connecting plate and the sixth connecting plate 55 are fixedly connected by a synchronization plate, so that the height of the first guide wheel 56 and the second guide wheel 57 can be kept consistent, maintaining the stability of the installation of the net chair frame 6 and the net 9.

[0058] In this embodiment, the end of the telescopic rod of the first pulling cylinder 51 is fixedly installed on the rear first pulling block 52, and the first pulling hole 521 is opened on the first pulling block 52; the end of the telescopic rod of the second pulling cylinder 53 is fixedly installed on the rear second pulling block 54, and the second pulling hole 541 is opened on the second pulling block 54; the first pulling hole 521 includes a first avoidance portion and a first driving portion, one end of the first avoidance portion is connected to the first driving portion, and the other end of the first avoidance portion extends and passes through the first pulling block 52; the second pulling hole 541 includes a second avoidance portion 5412 and a second driving portion 5411, one end of the second avoidance portion 5412 is connected to the second driving portion 5411, and the other end of the second avoidance portion 5412 extends and passes through the second pulling block 54.

[0059] More preferably, there are multiple first pull-out holes 521, and the driving parts of these multiple first pull-out holes 521 are of different heights. There are multiple second pull-out holes 541, and the second driving parts 5411 of these multiple second pull-out holes 541 are of different heights. This allows the device to be compatible with steel wire ropes 92 of different lengths, nets 9 of different specifications, and net chair frames 6 of different specifications, thereby improving the device's versatility.

[0060] In this embodiment, the placement device also includes a positioning box 69 for placing the positioning mold 7. The positioning box 69 is fixedly installed on the top of the workbench 1. The positioning box 69 is provided with a placement cavity with an opening facing upward. The outline of the positioning mold 7 is consistent with the outline of the placement cavity.

[0061] In this embodiment, Figure 1As shown, an electric control cabinet 8 is fixedly installed on the workbench 1.

[0062] like Figure 11 and Figure 12 As shown, the net chair frame 6 includes a first support portion 61, a second support portion 62, a third support portion 63 and a fourth support portion 64, and the first support portion 61, the second support portion 62, the third support portion 63 and the fourth support portion 64 are sequentially closed and downwardly enclosed to form a frame structure; the first support portion 61, the second support portion 62, the third support portion 63 and the fourth support portion 64 are all arc-shaped, wherein the first support portion 61 and the second support portion 62 are both downwardly convex, and the third support portion 63 and the fourth support portion 64 are upwardly convex; the side of the net chair frame 6 covering the stretched net 9 is a supporting surface 68, and the side opposite to the supporting surface 68 is a mounting surface 67, and a first protrusion 65 is raised on the mounting surface 67, and the first protrusion 65 is arranged around the inner hole of the net chair frame 6, and a second protrusion 66 is raised on the first protrusion 65, and the second protrusion 66 is arranged around the inner hole of the first protrusion 65, and a plurality of connecting seats are raised on the first protrusion 65 for its inner hole; as shown Figure 13 and Figure 14 As shown, the net 9 includes a net body 91 and a steel wire rope 92 passing through the net body 91 . Both ends of the steel wire rope 92 extend from the net body 91 , and both ends of the steel wire rope 92 are fixed with limit blocks 93 .

[0063] The steps of assembling the net chair frame 6 and the stretched net 9 using the above equipment are as follows:

[0064] Step 1) Position the support surface 68 of the net chair frame 6 downward and the mounting surface 67 of the net chair frame 6 upward, then hook the third support portion 63 of the net chair frame 6 on the rear positioning portion 451 of the rear positioning plate 45, and push the first front positioning plate 43 and the second front positioning plate 44 backward so that the first positioning portion of the net chair frame 6 is hooked on the first front positioning portion 431 of the first front positioning plate 43 and the second front positioning portion 441 of the second front positioning plate 44; wherein the first front positioning plate 43, the second front positioning plate 44, and the rear positioning plate 45 all abut against the inner wall of the net chair frame 6, and the first front positioning portion 431, the second front positioning portion 441, and the rear positioning portion 451 all abut against the support surface 68 of the net chair frame 6;

[0065] Step 2) The second cylinder 46 drives the fourth connecting plate 47 downward, causing the first pressing block 41 and the second pressing block 42 on the fourth connecting plate 47 to press against the second supporting portion 62 and the fourth supporting portion 64 of the net chair frame 6, respectively, thereby deforming the net chair frame 6. The second protrusion 66 of the net chair frame 6 is located between the first limiting portion 411 of the first pressing block 41 and the second limiting portion 421 of the second frame.

[0066] Step 3) The first cylinder 2 drives the second bracket 22 to move the mesh chair frame 6 downward, causing the deformed mesh chair frame 6 to press the stretched mesh 9 laid flat on the positioning mold 7 and move downward into the positioning film placement slot 71, with the edge of the stretched mesh 9 tilted upward;

[0067] Step 4) Cross the ends of the wire rope 92, place the stopper at one end of the wire rope 92 on the first pulling hole 521 of the first pulling cylinder 51, and place the stopper at the other end of the wire rope 92 on the second pulling hole 541 of the second pulling cylinder 53. The portion of the wire rope 92 located above the crossover point presses against the outer circumferential surfaces of the first guide wheel 56 and the second guide wheel 57.

[0068] Step 5) The first pulling cylinder 51 and the second pulling cylinder 53 are activated to reduce the length of the steel wire rope 92 on the stretching net 9, tightening the edge of the stretching net 9 and wrapping the edge of the deformed mesh chair frame around the stretching net 9, thus tightening the stretching net 9 once more.

[0069] Step 6) Use a nail gun to fix the two ends of the wire rope 92 at the intersection of the wire rope 92, and then reset the first cylinder 2, the second cylinder 46, the first pulling cylinder 51 and the second pulling cylinder 53, and then remove the mesh chair frame 6 with the tensioning net 9 installed from the equipment; among them, when the second cylinder 46 is reset, the first pressing block 41 and the second pressing block 42 are separated from the mesh chair frame 6, and after the mesh chair frame returns to its original shape, the tensioning net 9 is tightened again.

[0070] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0071] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.

Claims

1. A mesh stretching device for a mesh chair frame, characterized by: It comprises a workbench (1), a lifting device, a deformation device, a placing device and a covering device; The placing device comprises a positioning mold (7), the positioning mold (7) is installed on the workbench (1), a placing groove (71) is provided on the top of the positioning mold (7), and the central position of the placing groove (71) is recessed downward so that the positioning mold (7) is hollow; The lifting device comprises a first cylinder (2), a first bracket (11) and a second bracket (22), wherein the first bracket (11) is fixed on the workbench (1), the first cylinder (2) is mounted on the first bracket (11), the second bracket (22) is mounted on the telescopic end of the first cylinder (2), and the second bracket (22) is located above the positioning mold (7); The deformation device includes a front positioning plate, a rear positioning plate (45) and a fourth connecting plate (47), the front positioning plate and the rear positioning plate (45) are arranged front and back, the front positioning plate is mounted on the second bracket (22) in a manner that it can slide back and forth, the rear positioning plate (45) is fixed on the second bracket (22), the fourth connecting plate (47) is located between the front positioning plate and the rear positioning plate (45), and the fourth connecting plate (47) is mounted on the second bracket (22) in a manner that it can move up and down; the front positioning plate and the rear positioning plate (45) can support the front and rear ends of the net chair frame (6) from bottom to top, and the fourth connecting plate (47) can press the left and right ends of the net chair frame (6) from top to bottom to deform the net chair frame; The covering device comprises a first pulling cylinder (51) and a second pulling cylinder (53), and the first pulling cylinder (51) and the second pulling cylinder (53) can respectively pull the two ends of the steel wire rope (92) extending from the stretched net (9), so that the stretched net (9) covers the net chair frame (6).

2. The mesh stretching device for a mesh chair frame according to claim 1, characterized in that: A front supporting portion protrudes forward on the front positioning plate, and a rear positioning portion (451) protrudes backward on the rear positioning plate (45).

3. The mesh stretching device for a mesh chair frame according to claim 1, characterized in that: The front positioning plate comprises a first front positioning plate (43) and a second front positioning plate (44), the first front positioning plate (43) and the second front positioning plate (44) being arranged symmetrically on the left and right, and the rear positioning plate (45) is located behind the middle position of the first front positioning plate (43) and the second front positioning plate (44).

4. The mesh stretching device for a mesh chair frame according to claim 1, characterized in that: A first fixing plate (432) and a second fixing plate (442) are fixed on the second bracket (22); the first fixing plate (432) and the first front positioning plate (43) are arranged front and back; the second fixing plate (442) and the second front positioning plate (44) are arranged front and back; a first guide column (433) is fixed on the first front positioning plate (43); the first guide column (433) is slidably connected to the first fixing plate (432); a second guide column (443) is fixed on the second front positioning plate (44); the second guide column (443) is slidably connected to the second fixing plate (442).

5. The mesh stretching device for a mesh chair frame according to claim 4, characterized in that: A first return spring is sleeved on the first guide column (433), and two ends of the first return spring respectively abut against the first front positioning plate (43) and the first fixed plate (432); a second return spring is sleeved on the second guide column (443), and two ends of the second return spring respectively abut against the second front positioning plate (44) and the second fixed plate (442).

6. The mesh stretching device for a mesh chair frame according to claim 1, characterized in that: The deformation device further comprises a second cylinder (46), a cylinder body of the second cylinder (46) being fixed on the second bracket (22), and a telescopic end of the second cylinder (46) being connected to the middle position of the fourth connecting plate (47).

7. The mesh stretching device for a mesh chair frame according to claim 1, characterized in that: The deformation device further comprises a first pressing block (41) and a second pressing block (42), wherein the first pressing block (41) and the second pressing block (42) are arranged on the left and right, and the first pressing block (41) and the second pressing block (42) are both slidably mounted on the fourth connecting plate (47).

8. The mesh stretching device for a mesh chair frame according to claim 1, characterized in that: The covering device includes two first pulling blocks (52) and a second pulling block (54), wherein the first pulling block (52) is fixed on the telescopic end of the first pulling cylinder (51), and the second pulling block (54) is fixed on the telescopic end of the second pulling cylinder (53). The first pulling block (52) is provided with a first pulling hole (521) matching the end of the steel wire rope (92), and the second pulling block (54) is provided with a second pulling hole (541) matching the end of the steel wire rope (92).

9. The mesh stretching device for a mesh chair frame according to claim 1, characterized in that: The covering device has two guide wheels, which are located between the first drawer block (52) and the second drawer block (54). The guide wheels are located below the lowest point of the telescopic end of the first drawer block (52) and the telescopic end of the second drawer block (54).

10. The mesh stretching device for a mesh chair frame according to claim 1, characterized in that: The placement device comprises a positioning box (69), which is fixedly mounted on the top of the workbench (1). The positioning box is provided with a placement cavity with an upward opening, and the contour of the positioning mold (7) is consistent with the contour of the placement cavity.

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