Plastic chair injection mold with human engineering chair surface structure

Abstract

The utility model provides a plastic chair injection mold with an ergonomic chair surface structure, and belongs to the technical field of molds. The mold comprises an upper mold plate, a lower mold plate and a middle mold plate which is obliquely arranged between the upper mold plate and the lower mold plate, wherein a plastic chair molding cavity is formed among the upper mold plate, the middle mold plate and the lower mold plate. The chair seat reinforcing rib plate forming structure can form a chair seat reinforcing rib plate at the bottom of the chair seat so as to enhance the overall strength of the chair seat, and the chair back reinforcing rib plate forming structure can form a chair back reinforcing rib plate on the back surface of the chair back so as to enhance the overall strength of the chair back. According to the rear chair leg reinforcing structure, the rear chair leg reinforcing rib plates can be formed at the rear chair legs and the joints of the rear chair legs and the chair back, so that the connecting strength between the rear chair legs and the chair back can be enhanced, and as the rear chair legs and the chair seat are integrally formed, the connecting strength between the chair seat and the chair back can be indirectly enhanced.

Description

Technical Field

[0001] The utility model belongs to the technical field of molds and relates to an injection mold for a plastic chair with an ergonomic chair surface structure. Background Art

[0002] Plastic chair molds generally form products through mold injection molding. In the prior art, plastic chairs generally adopt integral injection molding or split injection molding. When an integrally injection-molded plastic chair is injection-molded, considering the comfort of users when sitting, there needs to be a certain inclination angle between the backrest and the seat. However, the backrest with an inclination angle will be subjected to greater pressure when the user sits, and it is prone to breakage.

[0003] For example, a Chinese patent discloses an injection mold for a plastic chair [Application No.: 202321518787.1], which includes a fixed mold and a movable mold. After the fixed mold and the movable mold are closed, a chair-shaped chair cavity is formed. On the fixed mold, armrest blocks and connecting inserts symmetrically arranged on both sides of the chair cavity are provided. An armrest cavity is opened on the armrest block, and the armrest cavity communicates with the chair cavity. The connecting insert is located at the connection between the chair cavity and the armrest cavity and is detachably connected to the fixed mold. The connecting insert is used to block the connection between the armrest cavity and the chair cavity, or the connecting insert is provided with a connecting cavity communicating the armrest cavity and the chair cavity. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the above problems and provide an injection mold for a plastic chair with an ergonomic chair surface structure.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] An injection mold for a plastic chair with an ergonomic chair surface structure includes an upper template, a lower template, and an intermediate template inclined between the upper template and the lower template. A plastic chair forming cavity is formed among the upper template, the intermediate template, and the lower template. The plastic chair forming cavity includes a backrest forming part arranged between the upper template and the lower template, a seat forming part, a front chair leg forming part, and an armrest forming part arranged between the intermediate template and the lower template, and a rear chair leg forming part arranged between the intermediate template and the upper template. An arc-shaped seat-back connecting part is further formed between the intermediate template and the lower template. The intermediate template is provided with a seat reinforcing rib plate forming structure at the position of the seat forming part. The upper template is further provided with a backrest reinforcing rib plate forming structure at the position of the backrest forming part. A rear chair leg strengthening structure connecting the rear chair leg forming part and the backrest forming part is further arranged between the intermediate template and the upper template.

[0007] In the above-mentioned plastic chair injection mold with an ergonomic chair surface structure, the seat reinforcing rib plate forming structure includes a number of front and rear side reinforcing rib plate forming grooves and a number of left and right side reinforcing rib plate forming grooves. The number of front and rear side reinforcing rib plate forming grooves and the number of left and right side reinforcing rib plate forming grooves are recessed inwardly on the intermediate template and enclose a rectangle. The upper openings of the front and rear side reinforcing rib plate forming grooves and the left and right side reinforcing rib plate forming grooves are connected to the seat forming part, and both sides of the front and rear side reinforcing rib plate forming grooves and the left and right side reinforcing rib plate forming grooves penetrate through the intermediate template.

[0008] In the above-mentioned plastic chair injection mold with an ergonomic chair surface structure, a number of seat side reinforcing rib plate forming grooves are connected to one side of the front and rear side reinforcing rib plate forming grooves and the left and right side reinforcing rib plate forming grooves away from the center of the seat forming part. The seat side reinforcing rib plate forming grooves are perpendicular to the front and rear side reinforcing rib plate forming grooves or the left and right side reinforcing rib plate forming grooves.

[0009] In the above-mentioned plastic chair injection mold with an ergonomic chair surface structure, the backrest reinforcing rib plate forming structure includes two backrest reinforcing rib plate forming grooves respectively arranged on the back of the backrest forming part and connected to the back of the backrest forming part. The backrest reinforcing rib plate forming grooves are recessed inwardly on the upper template.

[0010] In the above-mentioned plastic chair injection mold with an ergonomic chair surface structure, the rear chair leg strengthening structure includes an inner forming surface of the rear chair leg reinforcing rib plate arranged on both sides of the intermediate template and an outer forming surface of the rear chair leg reinforcing rib plate arranged on both sides of the upper template. A rear chair leg reinforcing rib plate forming groove is formed between the inner forming surface of the rear chair leg reinforcing rib plate and the outer forming surface of the rear chair leg reinforcing rib plate. The bottom opening of the rear chair leg reinforcing rib plate forming groove is connected to the rear chair leg forming part.

[0011] In the above-mentioned plastic chair injection mold with an ergonomic chair surface structure, the top openings of the rear chair leg reinforcing rib plate forming grooves are respectively connected to the backrest reinforcing rib plate forming grooves and the left and right side reinforcing rib plate forming grooves.

[0012] In the above-mentioned plastic chair injection mold with an ergonomic chair surface structure, a non-destructive ejection mechanism is further provided on the intermediate template.

[0013] In the above-mentioned injection mold for a plastic chair with an ergonomic chair surface structure, the non-damaging ejection mechanism includes an ejection cavity arranged in the middle template. A top plate is arranged in the ejection cavity. An ejection driver is inclinedly arranged on one end face of the middle template away from the chair seat forming part. The end of the output shaft of the ejection driver is fixedly connected to the top plate. A plurality of ejection rods with outer ends connected to the chair seat forming part are also fixedly connected to the top plate. The connection part of the ejection rod and the chair seat forming part is located inside the front and rear side reinforcing rib plate forming grooves, the left and right side reinforcing rib plate forming grooves or the chair seat side reinforcing rib plate forming grooves.

[0014] In the above-mentioned injection mold for a plastic chair with an ergonomic chair surface structure, a high-pressure air inlet pipe vertically inserted into the ejection cavity is further arranged on the upper template. A plurality of air ejector channels are arranged on one end face of the middle template close to the chair seat forming part. A valve is arranged in the connection end of the air ejector channel and the chair seat forming part.

[0015] In the above-mentioned injection mold for a plastic chair with an ergonomic chair surface structure, vertical lifting drivers are fixedly connected to both sides of the middle template. The end of the output shaft of the lifting driver is connected to the upper template through an adapter seat.

[0016] Compared with the existing technology, the advantages of the present utility model are as follows:

[0017] 1. The chair seat reinforcing rib plate forming structure can form a chair seat reinforcing rib plate at the bottom of the chair seat, thereby enhancing the overall strength of the chair seat. The backrest reinforcing rib plate forming structure can form a backrest reinforcing rib plate on the back of the backrest, thereby enhancing the overall strength of the backrest. The rear chair leg strengthening structure can form a rear chair leg reinforcing rib plate at the rear chair leg and the connection part between the rear chair leg and the backrest, thereby enhancing the connection strength between the rear chair leg and the connection part between the rear chair leg and the backrest. Since the rear chair leg and the chair seat are integrally formed, the connection strength between the chair seat and the backrest can also be indirectly enhanced.

[0018] 2. A plurality of front and rear side reinforcing rib plate forming grooves and a plurality of left and right side reinforcing rib plate forming grooves can form front and rear side reinforcing rib plates and left and right side reinforcing rib plates at the bottom of the chair seat during the injection molding of the plastic chair. The combination of the front and rear side reinforcing rib plates and the left and right side reinforcing rib plates can enhance the strength of the chair seat. The chair seat side reinforcing rib plate forming groove can form a chair seat side reinforcing rib plate at the outer periphery of the bottom of the chair seat during the injection molding of the plastic chair, thereby increasing the strength of the outer periphery of the chair seat.

[0019] Other advantages, objectives and features of the present utility model will be partially reflected by the following description, and partially will also be understood by those skilled in the art through the research and practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a cross-sectional view of the present utility model;

[0021] Figure 2 It is a schematic structural diagram of the lower template;

[0022] Figure 3 It is a schematic structural diagram of the upper template;

[0023] Figure 4 It is a schematic structural diagram of the middle template;

[0024] Figure 5 It is a partial structural schematic diagram of the middle template.

[0025] In the figure, there are upper template 1, lower template 2, middle template 3, plastic chair forming cavity 4, backrest forming part 5, seat forming part 6, front chair leg forming part 7, armrest forming part 8, rear chair leg forming part 9, seat-back connection part 10, seat reinforcing rib plate forming structure 11, backrest reinforcing rib plate forming structure 12, rear chair leg strengthening structure 13, front and rear side reinforcing rib plate forming grooves 14, left and right side reinforcing rib plate forming grooves 15, seat side reinforcing rib plate forming grooves 16, backrest reinforcing rib plate forming grooves 17, inner forming surface of rear chair leg reinforcing rib plate 18, outer forming surface of rear chair leg reinforcing rib plate 19, ejection cavity 20, top plate 21, ejection driver 22, ejection rod 23, high-pressure air inlet pipe 24, air jack flow channel 25, lifting driver 26. Specific implementation manner

[0026] As Figures 1-5 shown, an injection mold for a plastic chair with an ergonomic seat surface structure includes an upper template 1, a lower template 2, and a middle template 3 inclined between the upper template 1 and the lower template 2. A plastic chair forming cavity 4 is formed between the upper template 1, the middle template 3, and the lower template 2. The plastic chair forming cavity 4 includes a backrest forming part 5 arranged between the upper template 1 and the lower template 2, a seat forming part 6, a front chair leg forming part 7, and an armrest forming part 8 arranged between the middle template 3 and the lower template 2, and a rear chair leg forming part 9 arranged between the middle template 3 and the upper template 1. An arc-shaped seat-back connection part 10 is further formed between the middle template 3 and the lower template 2. The middle template 3 is provided with a seat reinforcing rib plate forming structure 11 at the position of the seat forming part 6. The upper template 1 is further provided with a backrest reinforcing rib plate forming structure 12 at the position of the backrest forming part 5. A rear chair leg strengthening structure 13 connecting the rear chair leg forming part 9 and the backrest forming part 5 is further provided between the middle template 3 and the upper template 1.

[0027] In the present utility model, the plastic chair forming cavity composed of a chair back forming part 5, a chair seat forming part 6, a front chair leg forming part 7, an armrest forming part 8, and a rear chair leg forming part 9 can integrally form a plastic chair product during injection molding. The chair seat and chair back connecting part 10 with an arc-shaped cross-section can make the connecting part between the chair seat and the chair back more ergonomic, improving the riding comfort of the plastic chair. The chair seat reinforcing rib plate forming structure 11 can form a chair seat reinforcing rib plate at the bottom of the chair seat, thereby enhancing the overall strength of the chair seat. The chair back reinforcing rib plate forming structure 12 can form a chair back reinforcing rib plate on the back of the chair back, thereby enhancing the overall strength of the chair back. The rear chair leg strengthening structure 13 can form a rear chair leg reinforcing rib plate at the rear chair leg and the connection between the rear chair leg and the chair back, thereby enhancing the connection strength between the rear chair leg and the connection between the rear chair leg and the chair back. Since the rear chair leg and the chair seat are integrally formed, the connection strength between the chair seat and the chair back can also be indirectly enhanced.

[0028] Specifically, the chair seat reinforcing rib plate forming structure 11 includes a plurality of front and rear side reinforcing rib plate forming grooves 14 and a plurality of left and right side reinforcing rib plate forming grooves 15. The plurality of front and rear side reinforcing rib plate forming grooves 14 and the plurality of left and right side reinforcing rib plate forming grooves 15 are recessed inwardly on the middle template 3 and enclose a rectangle. The upper openings of the front and rear side reinforcing rib plate forming grooves 14 and the left and right side reinforcing rib plate forming grooves 15 are connected to the chair seat forming part 6. The two sides of the front and rear side reinforcing rib plate forming grooves 14 and the left and right side reinforcing rib plate forming grooves 15 penetrate through the middle template 3. The plurality of front and rear side reinforcing rib plate forming grooves 14 and the plurality of left and right side reinforcing rib plate forming grooves 15 can form front and rear side reinforcing rib plates and left and right side reinforcing rib plates at the bottom of the chair seat during the injection molding of the plastic chair. The combination of the front and rear side reinforcing rib plates and the left and right side reinforcing rib plates can enhance the strength of the chair seat.

[0029] Specifically, a plurality of chair seat side reinforcing rib plate forming grooves 16 are connected to one side of the front and rear side reinforcing rib plate forming grooves 14 and the left and right side reinforcing rib plate forming grooves 15 away from the center of the chair seat forming part 6. The chair seat side reinforcing rib plate forming grooves 16 are perpendicular to the front and rear side reinforcing rib plate forming grooves 14 or the left and right side reinforcing rib plate forming grooves 15. The chair seat side reinforcing rib plate forming grooves 16 can form chair seat side reinforcing rib plates at the outer periphery of the bottom of the chair seat during the injection molding of the plastic chair, thereby increasing the strength of the outer periphery of the chair seat.

[0030] Specifically, the chair back reinforcing rib plate forming structure 12 includes two chair back reinforcing rib plate forming grooves 17 respectively arranged on the back of the chair back forming part 5 and connected to the back of the chair back forming part 5. The chair back reinforcing rib plate forming grooves 17 are recessed inwardly on the upper template 1. The chair back reinforcing rib plate forming grooves 17 can form a chair back reinforcing rib plate on the back of the plastic chair during the injection molding of the plastic chair, enhancing the strength of the chair back.

[0031] Specifically, the rear chair leg strengthening structure 13 includes an inner forming surface 18 of the rear chair leg strengthening rib plate disposed on both sides of the intermediate template 3 and an outer forming surface 19 of the rear chair leg strengthening rib plate disposed on both sides of the upper template 1. A rear chair leg strengthening rib plate forming groove is formed between the inner forming surface 18 of the rear chair leg strengthening rib plate and the outer forming surface 19 of the rear chair leg strengthening rib plate. The bottom opening of the rear chair leg strengthening rib plate forming groove is connected to the rear chair leg forming portion 9, and the top openings of the rear chair leg strengthening rib plate forming groove are respectively connected to the backrest strengthening rib plate forming groove 17 and the left and right side strengthening rib plate forming grooves 15. The rear chair leg strengthening rib plate forming groove can form a rear chair leg strengthening rib plate on the rear chair leg during the injection molding of the plastic chair. The connection of the top openings of the rear chair leg strengthening rib plate forming groove to the backrest strengthening rib plate forming groove 17 and the left and right side strengthening rib plate forming grooves 15 respectively enables the rear chair leg strengthening rib plate to be connected to the left and right side strengthening rib plates and the backrest strengthening rib plate, thereby increasing the connection strength between the seat and the backrest.

[0032] Preferably, the intermediate template 3 is further provided with a non-damaging ejection mechanism, which can prevent the plastic chair from being damaged during ejection;

[0033] Specifically, the non-damaging ejection mechanism includes an ejection cavity 20 disposed in the intermediate template 3. A top plate 21 is disposed in the ejection cavity 20. An ejection driver 22 is inclinedly disposed on an end face of the intermediate template 3 away from the seat forming portion 6. The end of the output shaft of the ejection driver 22 is fixedly connected to the top plate 21. A plurality of ejection rods 23 with outer ends connected to the seat forming portion 6 are further fixedly connected to the top plate 21. The connection portion of the ejection rod 23 and the seat forming portion 6 is located inside the front and rear side strengthening rib plate forming grooves 14, the left and right side strengthening rib plate forming grooves 15 or the seat side strengthening rib plate forming groove 16. When the plastic chair is demolded, the ejection driver 22 can drive the top plate to move. The movement of the top plate can drive the ejection rod to move. The movement of the ejection rod can apply a thrust to the seat portion of the plastic chair to eject the plastic chair from the intermediate template. The connection portion of the ejection rod 23 and the seat forming portion 6 being located inside the front and rear side strengthening rib plate forming grooves 14, the left and right side strengthening rib plate forming grooves 15 or the seat side strengthening rib plate forming groove 16 can enable the connection portion of the ejection rod and the seat to be located at the front and rear side strengthening rib plates, the left and right side strengthening rib plates or the seat side strengthening rib plates, thereby preventing the seat from being damaged during ejection.

[0034] Those skilled in the art should understand that the ejection driver can be an oil cylinder, a cylinder or a linear motor, etc.

[0035] Preferably, a high-pressure air inlet pipe 24 vertically inserted into the ejection cavity 20 is further provided on the upper template 1. A plurality of air ejector channels 25 are arranged on one end face of the intermediate template 3 close to the seat forming part 6. A valve is arranged inside the connecting end of the air ejector channel 25 and the seat forming part 6. Before the plastic chair is ejected, high-pressure gas can be introduced into the ejection cavity through the high-pressure air inlet pipe 24. The high-pressure gas can enter the connection between the seat and the intermediate template through the air ejector channels 25, so that the seat and the intermediate template can be separated, and the seat can be separated from the intermediate template under a smaller thrust force.

[0036] Specifically, lifting drivers 26 vertically arranged are fixedly connected to both sides of the intermediate template 3. The end of the output shaft of the lifting driver 26 is connected to the upper template 1 through an adapter seat. When the mold is opened, the upper template and the intermediate template move upward to separate from the lower template, and then the lifting driver can drive the upper template to move upward to separate the upper template and the intermediate template.

[0037] Those skilled in the art should understand that the lifting driver can be an oil cylinder, a cylinder or a linear motor, etc.

[0038] The working principle of the present utility model is as follows: The plastic chair forming cavity composed of the backrest forming part 5, the seat forming part 6, the front chair leg forming part 7, the armrest forming part 8 and the rear chair leg forming part 9 can integrally form a plastic chair product during injection molding. The seat-back connecting part 10 with an arc-shaped cross-section can make the connection part between the seat and the backrest more ergonomic, improve the riding comfort of the plastic chair. The seat reinforcing rib plate forming structure 11 can form a seat reinforcing rib plate at the bottom of the seat to enhance the overall strength of the seat. The backrest reinforcing rib plate forming structure 12 can form a backrest reinforcing rib plate on the back of the backrest to enhance the overall strength of the backrest. The rear chair leg strengthening structure 13 can form a rear chair leg reinforcing rib plate at the rear chair leg and the connection between the rear chair leg and the backrest to enhance the connection strength between the rear chair leg and the connection between the rear chair leg and the backrest. Since the rear chair leg and the seat are integrally formed, the connection strength between the seat and the backrest can also be indirectly enhanced;

[0039] A number of front and rear reinforcing rib plate forming grooves 14 and a number of left and right reinforcing rib plate forming grooves 15 can form front and rear reinforcing rib plates and left and right reinforcing rib plates at the bottom of the seat during the injection molding of the plastic chair. The combination of the front and rear reinforcing rib plates and the left and right reinforcing rib plates can enhance the strength of the seat. The seat side reinforcing rib plate forming groove 16 can form a seat side reinforcing rib plate at the outer periphery of the bottom of the seat during the injection molding of the plastic chair, thereby increasing the strength of the outer periphery of the seat. The backrest reinforcing rib plate forming groove 17 can form a backrest reinforcing rib plate on the back of the plastic chair during the injection molding of the plastic chair, which can enhance the strength of the backrest. The rear chair leg reinforcing rib plate forming groove can form a rear chair leg reinforcing rib plate on the rear chair leg during the injection molding of the plastic chair. The top openings of the rear chair leg reinforcing rib plate forming grooves are respectively connected to the backrest reinforcing rib plate forming groove 17 and the left and right reinforcing rib plate forming grooves 15, enabling the rear chair leg reinforcing rib plate to be connected to the left and right reinforcing rib plates and the backrest reinforcing rib plate, thereby increasing the connection strength between the seat and the backrest;

[0040] The non-damaging ejection mechanism can prevent the plastic chair from being damaged during ejection. When the plastic chair is demolded, the ejection driver 22 can drive the top plate to move. The movement of the top plate can drive the ejector rod to move. The movement of the ejector rod can apply a thrust to the seat part of the plastic chair to eject the plastic chair from the middle template. The connection between the ejector rod 23 and the seat forming part 6 is located inside the front and rear reinforcing rib plate forming grooves 14, the left and right reinforcing rib plate forming grooves 15 or the seat side reinforcing rib plate forming groove 16, which can make the connection between the ejector rod and the seat be located at the front and rear reinforcing rib plates, the left and right reinforcing rib plates or the seat side reinforcing rib plate, thereby preventing the seat from being damaged during ejection. Before the plastic chair is ejected, high-pressure gas can be introduced into the ejection cavity through the high-pressure air inlet pipe 24. The high-pressure gas can enter the connection between the seat and the middle template through the air ejector flow channel 25, enabling the seat and the middle template to be separated, so that the seat can be separated from the middle template under a smaller thrust. When the mold is opened, the upper template and the middle template move upward to separate from the lower template, and then the upper template can be driven to move upward by the lifting driver to separate the upper template and the middle template.

[0041] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art of the present invention can make various modifications or supplements to the described specific embodiments or use similar methods to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0042] Although the upper template 1, lower template 2, middle template 3, plastic chair molding cavity 4, backrest molding part 5, seat molding part 6, front chair leg molding part 7, armrest molding part 8, rear chair leg molding part 9, seat-back connection part 10, seat reinforcing rib plate molding structure 11, backrest reinforcing rib plate molding structure 12, rear chair leg strengthening structure 13, front and rear side reinforcing rib plate molding grooves 14, left and right side reinforcing rib plate molding grooves 15, seat side reinforcing rib plate molding grooves 16, backrest reinforcing rib plate molding grooves 17, inner molding surface of rear chair leg reinforcing rib plate 18, outer molding surface of rear chair leg reinforcing rib plate 19, ejection cavity 20, top plate 21, ejection driver 22, ejection rod 23, high-pressure air inlet pipe 24, air jack runner 25, lifting driver 26, etc. are used more frequently in this article, the use of these terms is only for more convenient description and explanation of the essence of the present utility model; interpreting them as any additional limitation is contrary to the spirit of the present utility model.

Claims

1. A plastic chair injection mold with an ergonomic chair seat structure, comprising an upper mold plate (1), a lower mold plate (2), and an intermediate mold plate (3) obliquely arranged between the upper mold plate (1) and the lower mold plate (2), characterized in that: A plastic chair molding cavity (4) is formed between the upper template (1), the middle template (3) and the lower template (2). The plastic chair molding cavity (4) includes a chair back molding portion (5) arranged between the upper template (1) and the lower template (2), a chair seat molding portion (6) arranged between the middle template (3) and the lower template (2), a front chair leg molding portion (7) and an armrest molding portion (8), and a rear chair leg molding portion (9) arranged between the middle template (3) and the upper template (1). A chair back connection portion (10) with an arc-shaped cross section is also formed between the intermediate template (3) and the lower template (2); a seat reinforcing rib plate forming structure (11) is provided at the seat forming portion (6) of the intermediate template (3); a seat back reinforcing rib plate forming structure (12) is provided at the seat back forming portion (5) of the upper template (1); and a rear leg reinforcing structure (13) connecting the rear leg forming portion (9) and the seat back forming portion (5) is also provided between the intermediate template (3) and the upper template (1).

2. The plastic chair injection mold with an ergonomic chair seat structure according to claim 1, characterized in that: The seat reinforcement rib plate forming structure (11) comprises a plurality of front and rear reinforcement rib plate forming grooves (14) and a plurality of left and right reinforcement rib plate forming grooves (15). The plurality of front and rear reinforcement rib plate forming grooves (14) and the plurality of left and right reinforcement rib plate forming grooves (15) are inwardly recessed and arranged on the middle template (3) and enclose a rectangular shape. The upper openings of the front and rear reinforcement rib plate forming grooves (14) and the left and right reinforcement rib plate forming grooves (15) are connected to the seat forming portion (6), and the front and rear reinforcement rib plate forming grooves (14) and the left and right reinforcement rib plate forming grooves (15) pass through the middle template (3) on both sides.

3. The plastic chair injection mold with an ergonomic chair seat structure according to claim 2, characterized in that: The front and rear side reinforcing rib plate forming grooves (14) and the left and right side reinforcing rib plate forming grooves (15) are connected to a plurality of seat side reinforcing rib plate forming grooves (16) on one side away from the center of the seat forming portion (6), and the seat side reinforcing rib plate forming grooves (16) are perpendicular to the front and rear side reinforcing rib plate forming grooves (14) or the left and right side reinforcing rib plate forming grooves (15).

4. The plastic chair injection mold with an ergonomic chair seat structure according to claim 3, characterized in that: The backrest reinforcing rib plate forming structure (12) comprises two backrest reinforcing rib plate forming grooves (17) respectively arranged on the back side of the backrest forming part (5) and connected to the back side of the backrest forming part (5); the backrest reinforcing rib plate forming grooves (17) are recessed inwardly and arranged on the upper template (1).

5. The plastic chair injection mold with an ergonomic chair seat structure according to claim 4, characterized in that: The rear leg reinforcement structure (13) comprises an inner molding surface (18) of a rear leg reinforcement rib plate arranged on both sides of the middle template (3) and an outer molding surface (19) of a rear leg reinforcement rib plate arranged on both sides of the upper template (1), a rear leg reinforcement rib plate molding groove is formed between the inner molding surface (18) of the rear leg reinforcement rib plate and the outer molding surface (19) of the rear leg reinforcement rib plate, and a bottom opening of the rear leg reinforcement rib plate molding groove is connected to the rear leg molding portion (9).

6. The plastic chair injection mold with an ergonomic chair seat structure according to claim 5, characterized in that: The top opening of the rear leg reinforcing rib plate forming groove is respectively connected to the backrest reinforcing rib plate forming groove (17) and the left and right side reinforcing rib plate forming grooves (15).

7. The plastic chair injection mold with an ergonomic chair seat structure according to claim 6, characterized in that: The middle template (3) is also provided with a non-destructive ejection mechanism.

8. The plastic chair injection mold with an ergonomic chair seat structure according to claim 7, characterized in that: The non-destructive ejection mechanism comprises an ejection cavity (20) arranged in the middle template (3), a ejection plate (21) is arranged in the ejection cavity (20), an ejection driver (22) is obliquely arranged on the end surface of the middle template (3) away from the seat forming part (6), the output shaft end of the ejection driver (22) is fixedly connected to the ejection plate (21), and a plurality of ejection rods (23) whose outer ends are connected to the seat forming part (6) are also fixedly connected to the ejection plate (21), and the connection between the ejection rods (23) and the seat forming part (6) is located on the inner side of the front and rear side reinforcing rib plate forming grooves (14), the left and right side reinforcing rib plate forming grooves (15) or the seat side reinforcing rib plate forming grooves (16).

9. The plastic chair injection mold with an ergonomic chair seat structure according to claim 8, characterized in that: The upper template (1) is also provided with a high-pressure air inlet pipe (24) vertically inserted into the ejection cavity (20), and the middle template (3) is provided with a plurality of air top flow channels (25) on the end surface of one side close to the seat forming part (6), and a valve is provided in the connection end between the air top flow channel (25) and the seat forming part (6).

10. The plastic chair injection mold with an ergonomic chair seat structure according to claim 9, characterized in that: The two sides of the middle template (3) are also fixedly connected with vertically arranged lifting drivers (26), and the output shaft end of the lifting driver (26) is connected to the upper template (1) through a transfer seat.

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