Hollow-out chair back forming mechanism of integrated plastic chair mold

Abstract

The utility model belongs to the technical field of molds, and relates to a hollowed-out chair back forming mechanism of an integrated plastic chair mold. The integrated plastic chair forming die comprises an integrated plastic chair forming lower die and an integrated plastic chair forming upper die. Molten materials are injected into the cavity through the injection molding main plate, the embedded hollowed-out chair back forming assembly is used for synchronously forming a hollowed-out structure of a plastic chair back, secondary carving and hollowing-out do not need to be carried out on the plastic chair back, it can be guaranteed that a plastic part is integrally formed, the structure of the plastic chair back is strengthened, the rejection rate is reduced, and after injection molding is completed, the product quality is improved. The integrated plastic chair forming lower mold and the integrated plastic chair forming upper mold are opened, the whole plastic part is completely exposed, the front chair legs and the rear chair legs are exposed, at the moment, the formed plastic part is ejected and demolded along the bottom of the chair surface of the plastic part through the chair body ejection demolding part, the chair legs and the chair surface are separated from the auxiliary forming seat at the same time during ejection, and one-time demolding is achieved. The demoulding is smooth.

Description

TECHNICAL FIELD

[0001] The utility model belongs to mould technical field relates to a hollow chair back forming mechanism of integrated plastic chair mould. BACKGROUND

[0002] Plastic chair is one of the chair used in daily life. Its characteristic is light weight, convenient to carry, suitable for a variety of scenes. At present, plastic chair is generally formed by injection moulding. The existing plastic chair mould is generally used in the injection moulding process, that is, a mould is used to injection moulding chair back and chair surface, another mould is used to injection moulding chair leg, and then the chair body and chair leg are connected by secondary assembly. When the chair back part needs to be hollowed out, it also needs to be hollowed out twice, which is complicated and prone to scrap during the process, affecting the production cost. Therefore, it is urgent to design a hollow chair back forming mechanism of integrated plastic chair mould which can overcome the above defects.

[0003] In order to overcome the defects of the prior art, people have explored various solutions. For example, a plastic chair back mould demoulding mechanism is disclosed in Chinese patent [application number: 201110141317.3], which comprises an upper and lower complex plate, the upper complex plate is connected with a pad block, the pad block is connected with a cavity insert block, the lower complex plate is installed with a foot, the foot is installed with a core insert block, the core insert block and the cavity insert block form a mould cavity, the mould cavity has a formed plastic chair back, the bottom of the plastic chair back is provided with a fixing hole, characterized in that the plastic chair back is obliquely arranged in the mould cavity, an oblique support is installed on the bottom surface of the core insert block, an oblique oil cylinder is installed on the oblique support, the oblique oil cylinder is connected with an oblique top plate, the oblique top plate is connected with an oblique top rod, the oblique top rod passes through the core insert block and contacts with the fixing hole, and the center line of the oblique top rod is consistent with the center line of the fixing hole. SUMMARY

[0004] The utility model aims at the above problems, and provides a hollow chair back forming mechanism of integrated plastic chair mould.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] The hollow back forming mechanism of the integrated plastic chair mold comprises an integrated plastic chair forming lower mold and an integrated plastic chair forming upper mold, an injection molding main plate is arranged above the integrated plastic chair forming upper mold, an auxiliary forming seat is arranged between the integrated plastic chair forming lower mold and the integrated plastic chair forming upper mold, a back forming upper part is arranged in the integrated plastic chair forming upper mold, a back forming lower part is arranged in the integrated plastic chair forming lower mold, an embedded hollow back forming assembly is arranged between the back forming upper part and the back forming lower part, the auxiliary forming seat is provided with a seat leg auxiliary forming part, and a chair body ejection demolding piece capable of reciprocating linearly is arranged in the auxiliary forming seat.

[0007] In the hollow back forming mechanism of the integrated plastic chair mold, the embedded hollow back forming assembly comprises a lower mold embedded hollow back forming block and an upper mold embedded hollow back forming block, the lower mold embedded hollow back forming block is provided with a back connecting strip forming protrusion, the upper mold embedded hollow back forming block is provided with a back connecting strip forming groove, the back connecting strip forming protrusion and the back connecting strip forming groove are in corresponding positions and matched in shape.

[0008] In the hollow back forming mechanism of the integrated plastic chair mold, the integrated plastic chair forming lower mold is provided with a first cooling pipeline connected with the lower mold embedded hollow back forming block.

[0009] In the hollow back forming mechanism of the integrated plastic chair mold, the integrated plastic chair forming upper mold is provided with a second cooling pipeline connected with the upper mold embedded hollow back forming block.

[0010] In the hollow back forming mechanism of the integrated plastic chair mold, the back forming upper part comprises a back first forming surface and a back ring first forming surface arranged in the integrated plastic chair forming upper mold, and the back first forming surface is connected with the upper mold embedded hollow back forming block.

[0011] In the hollow back forming mechanism of the integrated plastic chair mold, the back forming lower part comprises a back second forming surface and a back ring second forming surface arranged in the integrated plastic chair forming lower mold, the back second forming surface is connected with the lower mold embedded hollow back forming block, the back first forming surface and the back second forming surface are arranged opposite to each other, and the back ring first forming surface and the back ring second forming surface are arranged opposite to each other.

[0012] In the hollow back forming mechanism of the integrated plastic chair mold, the seat leg auxiliary forming part comprises a seat auxiliary forming surface, a rear chair leg auxiliary forming surface and a front chair body auxiliary forming surface arranged on the auxiliary forming seat.

[0013] In the hollow back forming mechanism of the one-piece plastic chair mold, the back leg forming surface in the one-piece plastic chair forming upper mold corresponds to the position of the back leg auxiliary forming surface and is matched in shape, the seat forming surface and the front chair leg forming surface in the one-piece plastic chair forming lower mold are arranged opposite to the seat auxiliary forming surface and the front chair leg forming surface respectively.

[0014] In the hollow back forming mechanism of the one-piece plastic chair mold, the ejecting straight rod arranged in the auxiliary forming seat is arranged opposite to the seat auxiliary forming surface.

[0015] In the hollow back forming mechanism of the one-piece plastic chair mold, the tail of the auxiliary forming seat is provided with a ejecting rod fixing plate driven by an oil cylinder.

[0016] Compared with the prior art, the one-piece plastic chair mold has the following advantages:

[0017] 1、the one-piece plastic chair forming lower mold and the one-piece plastic chair forming upper mold are moved close to each other, so that the chair surface leg auxiliary forming part of the one-piece plastic chair forming lower mold, the one-piece plastic chair forming upper mold and the auxiliary forming seat are matched to form the chair surface and the front and rear chair leg structure of the plastic part, the back forming upper part and the back forming lower part are used to form the back structure of the plastic part, the molten material is injected into the cavity through the injection main plate, and the embedded hollow back forming assembly is used to synchronously form the hollow structure of the back of the plastic part, so that the back of the plastic part does not need to be engraved and hollowed twice, the one-piece forming of the plastic part is ensured, the back structure of the plastic part is strengthened, the scrap rate is reduced, after injection molding, the one-piece plastic chair forming lower mold and the one-piece plastic chair forming upper mold are opened, and the whole plastic part is completely exposed, the front and rear chair legs are exposed, at this time, the molded plastic part is ejected and demolded along the bottom of the plastic part chair surface through the chair body ejecting and demolding assembly, the chair legs and the chair surface are simultaneously separated from the auxiliary forming seat during ejection, one-time demolding is realized, and demolding is smooth.

[0018] 2、after the injection molding is completed, the cooling water is introduced into the first cooling pipeline and the second cooling pipeline to synchronously cool the connecting strips at the hollow part of the back of the plastic part, so that the strength of the connecting strips is ensured.

[0019] Other advantages, objects and features of the present application will be apparent from the following description, and will be understood by those skilled in the art. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structural schematic diagram of the present application.

[0021] Figure 2 is a local structure schematic view of the utility model.

[0022] Figure 3 is another direction of the utility model local structure schematic view.

[0023] Figure 4 is the structure schematic view of the integrated plastic chair forming upper die.

[0024] In the figure: integrated plastic chair forming lower die 1, integrated plastic chair forming upper die 2, injection molding main plate 3, auxiliary forming seat 4, chair back forming upper part 5, chair back forming lower part 6, embedded hollow chair back forming assembly 7, chair surface leg auxiliary forming part 8, chair body ejection demoulding element 9, lower die embedded hollow chair back forming block 10, upper die embedded hollow chair back forming block 11, chair back connecting strip forming protrusion 12, chair back connecting strip forming groove 13, first cooling pipeline 14, second cooling pipeline 15, chair back first forming surface 16, chair back ring first forming surface 17, chair back second forming surface 18, chair back ring second forming surface 19, chair seat auxiliary forming surface 20, rear chair leg auxiliary forming surface 21, front chair body auxiliary forming surface 22, rear chair leg forming surface 23, chair seat forming surface 24, front chair leg forming surface 25, ejection straight rod 26, top rod fixed plate 27, oil cylinder 28. DETAILED DESCRIPTION

[0025] The utility model is further explained below in connection with the drawings.

[0026] As Figures 1-4 shown, a hollow chair back forming mechanism of integrated plastic chair mould, including integrated plastic chair forming lower die 1 and integrated plastic chair forming upper die 2, the integrated plastic chair forming upper die 2 top is equipped with injection molding main plate 3, the integrated plastic chair forming lower die 1 and integrated plastic chair forming upper die 2 between being equipped with auxiliary forming seat 4, the integrated plastic chair forming upper die 2 inside is equipped with chair back forming upper part 5, the integrated plastic chair forming lower die 1 inside is equipped with chair back forming lower part 6, the chair back forming upper part 5 with chair back forming lower part 6 between being equipped with embedded hollow chair back forming assembly 7, the auxiliary forming seat 4 has chair surface leg auxiliary forming part 8, the auxiliary forming seat 4 has the chair body ejection demoulding element 9 that can reciprocate along straight line in.

[0027] In the embodiment, during the injection molding process, the lower mold 1 and the upper mold 2 of the integrated plastic chair are moved close to each other, so that the lower mold 1, the upper mold 2 and the chair leg auxiliary forming part 8 of the auxiliary forming seat 4 are matched to form the chair surface and the front and rear chair leg structure of the plastic part, the back upper forming part 5 and the back lower forming part 6 are used to form the back structure of the plastic part, the molten material is injected into the cavity through the main injection plate 3, and the hollow back forming assembly 7 is used to synchronously form the hollow structure of the back of the plastic part, without the need for secondary carving and hollowing of the back of the plastic part, so that the plastic part is integrally formed, the back structure of the plastic part is strengthened, the scrap rate is reduced, after the injection molding is completed, the lower mold 1 and the upper mold 2 of the integrated plastic chair are opened, and the whole plastic part is completely exposed, the front and rear chair legs are exposed, at this time, the formed plastic part is ejected along the bottom of the chair surface through the chair body ejection demolding assembly 9, the chair legs and the chair surface are simultaneously separated from the auxiliary forming seat 4 during ejection, one-time demolding is realized, and demolding is smooth.

[0028] As shown in Figures 1-4 The lower mold 1 and the upper mold 2 of the integrated plastic chair are moved close to each other, so that the lower mold 1, the upper mold 2 and the chair leg auxiliary forming part 8 of the auxiliary forming seat 4 are matched to form the chair surface and the front and rear chair leg structure of the plastic part, the back upper forming part 5 and the back lower forming part 6 are used to form the back structure of the plastic part, the molten material is injected into the cavity through the main injection plate 3, and the hollow back forming assembly 7 is used to synchronously form the hollow structure of the back of the plastic part, without the need for secondary carving and hollowing of the back of the plastic part, so that the plastic part is integrally formed, the back structure of the plastic part is strengthened, the scrap rate is reduced, after the injection molding is completed, the lower mold 1 and the upper mold 2 of the integrated plastic chair are opened, and the whole plastic part is completely exposed, the front and rear chair legs are exposed, at this time, the formed plastic part is ejected along the bottom of the chair surface through the chair body ejection demolding assembly 9, the chair legs and the chair surface are simultaneously separated from the auxiliary forming seat 4 during ejection, one-time demolding is realized, and demolding is smooth.

[0029] Specifically, during the injection molding process, the lower mold 1 and the upper mold 2 of the integrated plastic chair are moved close to each other, so that the lower mold 1, the upper mold 2 and the chair leg auxiliary forming part 8 of the auxiliary forming seat 4 are matched to form the chair surface and the front and rear chair leg structure of the plastic part, the back upper forming part 5 and the back lower forming part 6 are used to form the back structure of the plastic part, the molten material is injected into the cavity through the main injection plate 3, and the hollow back forming assembly 7 is used to synchronously form the hollow structure of the back of the plastic part, without the need for secondary carving and hollowing of the back of the plastic part, so that the plastic part is integrally formed, the back structure of the plastic part is strengthened, the scrap rate is reduced, after the injection molding is completed, the lower mold 1 and the upper mold 2 of the integrated plastic chair are opened, and the whole plastic part is completely exposed, the front and rear chair legs are exposed, at this time, the formed plastic part is ejected along the bottom of the chair surface through the chair body ejection demolding assembly 9, the chair legs and the chair surface are simultaneously separated from the auxiliary forming seat 4 during ejection, one-time demolding is realized, and demolding is smooth.

[0030] As shown in Figure 1 , Figure 2 The lower mold 1 and the upper mold 2 of the integrated plastic chair are moved close to each other, so that the lower mold 1, the upper mold 2 and the chair leg auxiliary forming part 8 of the auxiliary forming seat 4 are matched to form the chair surface and the front and rear chair leg structure of the plastic part, the back upper forming part 5 and the back lower forming part 6 are used to form the back structure of the plastic part, the molten material is injected into the cavity through the main injection plate 3, and the hollow back forming assembly 7 is used to synchronously form the hollow structure of the back of the plastic part, without the need for secondary carving and hollowing of the back of the plastic part, so that the plastic part is integrally formed, the back structure of the plastic part is strengthened, the scrap rate is reduced, after the injection molding is completed, the lower mold 1 and the upper mold 2 of the integrated plastic chair are opened, and the whole plastic part is completely exposed, the front and rear chair legs are exposed, at this time, the formed plastic part is ejected along the bottom of the chair surface through the chair body ejection demolding assembly 9, the chair legs and the chair surface are simultaneously separated from the auxiliary forming seat 4 during ejection, one-time demolding is realized, and demolding is smooth.

[0031] In the embodiment, after the injection molding is completed, the cooling water is introduced into the first cooling pipeline 14 and the second cooling pipeline 15 to synchronously cool the connecting strips of the hollow part of the back of the plastic part from top to bottom, so as to ensure the strength of the connecting strips.

[0032] As shown in Figure 2As shown in the figure, the chair back forming upper part 5 includes a chair back first forming surface 16 and a chair back ring first forming surface 17 arranged in the one-piece plastic chair forming upper die 2, the chair back first forming surface 16 is connected with the embedded hollow chair back forming block 11 in the upper die, the chair back forming lower part 6 includes a chair back second forming surface 18 and a chair back ring second forming surface 19 arranged in the one-piece plastic chair forming lower die 1, the chair back second forming surface 18 is connected with the embedded hollow chair back forming block 10 in the lower die, the chair back first forming surface 16 and the chair back second forming surface 18 are arranged opposite to each other, and the chair back ring first forming surface 17 and the chair back ring second forming surface 19 are arranged opposite to each other.

[0033] In the embodiment, the chair back first forming surface 16 and the chair back second forming surface 18 cooperate to form the chair back structure of the plastic part, and the chair back ring first forming surface 17 and the chair back ring second forming surface 19 cooperate to form the chair back ring structure of the plastic part.

[0034] The chair seat leg auxiliary forming part 8 includes a chair seat auxiliary forming surface 20, a rear chair leg auxiliary forming surface 21 and a front chair body auxiliary forming surface 22 arranged on the auxiliary forming seat 4, the one-piece plastic chair forming upper die 2 has a rear chair leg forming surface 23, the rear chair leg forming surface 23 corresponds to the position of the rear chair leg auxiliary forming surface 21 and is matched in shape, the one-piece plastic chair forming lower die 1 has a chair seat forming surface 24 and a front chair leg forming surface 25, the chair seat forming surface 24 is arranged opposite to the chair seat auxiliary forming surface 20, and the front chair body auxiliary forming surface 22 is arranged opposite to the front chair leg forming surface 25.

[0035] In the embodiment, the rear chair leg forming surface 23 and the rear chair leg auxiliary forming surface 21 cooperate to form the rear chair leg structure of the plastic part, the chair seat forming surface 24 and the chair seat auxiliary forming surface 20 cooperate to form the chair seat structure of the plastic part, and the front chair body auxiliary forming surface 22 and the front chair leg forming surface 25 cooperate to form the front chair leg structure of the plastic part.

[0036] In combination Figure 2 , Figure 3 , Figure 4 As shown in the figure, the chair body ejection demolding part 9 includes a plurality of ejection straight rods 26 arranged in the auxiliary forming seat 4, the ejection straight rods 26 are arranged opposite to the chair seat auxiliary forming surface 20, the tail part of the auxiliary forming seat 4 is provided with a top rod fixing plate 27, and the top rod fixing plate 27 is driven by an oil cylinder 28.

[0037] In the embodiment, after the injection molding is completed, the oil cylinder 28 is started, the top rod fixing plate 27 and the ejection straight rods 26 are synchronously moved by the oil cylinder 28, the plastic part after forming is ejected along the bottom of the chair seat by the ejection straight rods 26, and the chair leg and the chair seat are simultaneously separated from the auxiliary forming seat 4 during the ejection, so that the one-time demolding is realized, and the demolding is smooth.

[0038] The working principle of the utility model is:

[0039] In the injection molding process, the integrated plastic chair forming lower die 1 and the integrated plastic chair forming upper die 2 are close to each other, the chair back first forming surface 16 and the chair back second forming surface 18 are matched to form the chair back structure of the plastic part, the chair back ring first forming surface 17 and the chair back ring second forming surface 19 are matched to form the chair back ring structure of the plastic part, the rear chair leg forming surface 23 and the rear chair leg auxiliary forming surface 21 are matched to form the rear chair leg structure of the plastic part, the chair seat forming surface 24 and the chair seat auxiliary forming surface 20 are matched to form the chair surface structure of the plastic part, the front chair body auxiliary forming surface 22 and the front chair leg forming surface 25 are matched to form the front chair leg structure of the plastic part, the molten material is injected into the cavity through the injection molding main plate 3, the lower die embedded hollow chair back forming block 10 and the upper die embedded hollow chair back forming block 11 are matched, the chair back connecting strip forming protrusion 12 and the chair back connecting strip forming groove 13 are matched to form the hollow structure of the plastic chair back, the rest of the chair back connecting strip forming protrusion 12 and the chair back connecting strip forming groove 13 are staggered to form the connecting strip of the hollow part of the plastic chair back, without the need for secondary carving and hollowing of the plastic chair back, the integrated molding of the plastic part can be ensured, the chair back structure of the plastic part is strengthened, and the scrap rate is reduced,

[0040] After the injection molding is completed, the cooling water is passed into the first cooling pipeline 14 and the second cooling pipeline 15 to cool the connecting strip of the hollow part of the plastic chair back synchronously, so that the strength of the connecting strip is ensured,

[0041] After the injection molding is completed, the mold is opened, the oil cylinder 28 is started, the ejector rod fixing plate 27 and the ejector straight rod 26 are driven by the oil cylinder 28 to move synchronously, the plastic part after forming is ejected along the bottom of the plastic chair surface through the ejector straight rod 26, and the chair leg and the chair surface are separated from the auxiliary forming seat 4 at the same time, one-time ejection is realized, and the ejection is smooth.

[0042] The specific embodiments described in the present application are only illustrative of the spirit of the utility model. Those skilled in the art to which the utility model belongs can make various modifications or supplements to the described specific embodiments or replace them with similar ways, without deviating from the spirit of the utility model.

[0043] Although the terms such as the integrated plastic chair forming lower die 1, the integrated plastic chair forming upper die 2, the injection molding main plate 3, the auxiliary forming seat 4, the chair back forming upper part 5, the chair back forming lower part 6, the embedded hollow chair back forming assembly 7, the chair surface leg auxiliary forming part 8, the chair body ejection demolding assembly 9, the lower die embedded hollow chair back forming block 10, the upper die embedded hollow chair back forming block 11, the chair back connecting strip forming protrusion 12, the chair back connecting strip forming groove 13, the first cooling pipeline 14, the second cooling pipeline 15, the chair back first forming surface 16, the chair back ring first forming surface 17, the chair back second forming surface 18, the chair back ring second forming surface 19, the chair seat auxiliary forming surface 20, the rear chair leg auxiliary forming surface 21, the front chair body auxiliary forming surface 22, the rear chair leg forming surface 23, the chair seat forming surface 24, the front chair leg forming surface 25, the ejection straight rod 26, the ejector rod fixing plate 27, the oil cylinder 28 are used more in the text, but the possibility of using other terms is not excluded. The use of these terms is only to facilitate the description and explanation of the essence of the utility model, and any additional limitation is contrary to the spirit of the utility model.

Claims

1. A mechanism for forming a cut-out backrest of an integrated plastic chair mould, comprising an integrated plastic chair forming lower mould (1) and an integrated plastic chair forming upper mould (2), characterized in that, The integrated plastic chair forming upper die (2) is provided with an injection molding main plate (3) above, the integrated plastic chair forming lower die (1) and integrated plastic chair forming upper die (2) between being provided with an auxiliary forming seat (4), the integrated plastic chair forming upper die (2) inside being provided with a back forming upper part (5), the integrated plastic chair forming lower die (1) inside being provided with a back forming lower part (6), the back forming upper part (5) and back forming lower part (6) between being provided with an embedded hollow back forming assembly (7), the auxiliary forming seat (4) having a seat leg auxiliary forming part (8) on, the auxiliary forming seat (4) inside having a chair body ejection demoulding element (9) that can reciprocate along a straight line.

2. The cut-out back forming mechanism of the one-piece plastic chair mold according to claim 1, wherein, The embedded hollow back forming assembly (7) includes a lower die embedded hollow back forming block (10) and an upper die embedded hollow back forming block (11), the lower die embedded hollow back forming block (10) inside having a back connecting strip forming protrusion (12), the upper die embedded hollow back forming block (11) inside having a back connecting strip forming groove (13), the back connecting strip forming protrusion (12) and back connecting strip forming groove (13) corresponding in position and matching in shape.

3. The cut-out back forming mechanism of the one-piece plastic chair mold according to claim 2, wherein, The integrated plastic chair forming lower die (1) inside is provided with a first cooling pipeline (14) connected with the lower die embedded hollow back forming block (10).

4. The cut-out back forming mechanism of the one-piece plastic chair mold according to claim 3, wherein, The integrated plastic chair forming upper die (2) inside is provided with a second cooling pipeline (15) connected with the upper die embedded hollow back forming block (11).

5. The cut-out back forming mechanism of the one-piece plastic chair mold according to claim 4, wherein, The back forming upper part (5) includes a back first forming surface (16) and a back ring first forming surface (17) arranged in the integrated plastic chair forming upper die (2), the back first forming surface (16) being connected with the upper die embedded hollow back forming block (11).

6. The cut-out back forming mechanism of the one-piece plastic chair mold according to claim 5, wherein, The back forming lower part (6) includes a back second forming surface (18) and a back ring second forming surface (19) arranged in the integrated plastic chair forming lower die (1), the back second forming surface (18) being connected with the lower die embedded hollow back forming block (10), the back first forming surface (16) and back second forming surface (18) being arranged opposite to each other, and the back ring first forming surface (17) and back ring second forming surface (19) being arranged opposite to each other.

7. The cut-out back forming mechanism of the one-piece plastic chair mold according to claim 6, wherein, The seat leg auxiliary forming part (8) includes a seat auxiliary forming surface (20), a rear chair leg auxiliary forming surface (21) and a front chair body auxiliary forming surface (22) arranged on the auxiliary forming seat (4).

8. The cut-out back forming mechanism of the one-piece plastic chair mold according to claim 7, wherein, The integrated plastic chair forming upper die (2) inside has a rear chair leg forming surface (23), the rear chair leg forming surface (23) corresponding in position and matching in shape with the rear chair leg auxiliary forming surface (21), the integrated plastic chair forming lower die (1) inside having a seat forming surface (24) and a front chair leg forming surface (25), the seat forming surface (24) being arranged opposite to the seat auxiliary forming surface (20), and the front chair body auxiliary forming surface (22) being arranged opposite to the front chair leg forming surface (25).

9. The cut-out back forming mechanism of the one-piece plastic chair mold according to claim 8, wherein, The chair body ejection demolding member (9) comprises a plurality of ejection straight rods (26) arranged in the auxiliary forming seat (4), and the ejection straight rods (26) are arranged opposite to the auxiliary seat forming surface (20).

10. The cut-out back forming mechanism of the one-piece plastic chair mold according to claim 9, wherein, The tail of the auxiliary forming seat (4) is provided with a top rod fixing plate (27), and the top rod fixing plate (27) is driven by an oil cylinder (28).

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