A helmet forming assembly mold and demoulding method thereof

Abstract

The present invention provides a helmet molding assembly mold and a demoulding method thereof, belonging to the technical field of injection molding. The helmet molding assembly mold is placed on a workbench, and includes an upper mold group, a lower mold group and a connecting unit. The upper mold group has an upper mold base, a concave mold is opened on one side of the upper mold base, and a sealing ring is fixed at the port of the concave mold; the lower mold group has a lower mold base arranged opposite to the upper mold base and fixed on the surface of the workbench, and a convex mold is fixed on the side wall of the lower mold base facing the concave mold; the connecting unit has a plurality of insertion parts connected to the peripheral side wall of the upper mold base, and a connecting block corresponding to the insertion part one by one and arranged on the lower mold base; the connecting block has a connecting cavity that is plugged and matched with the insertion part, and a limiting unit is arranged in the connecting cavity, and the limiting unit has two states of passing through and not passing through the insertion part. The present invention reduces the molding scrap rate.

Description

Technical Field

[0001] The invention belongs to the technical field of injection molding, and in particular relates to a helmet molding assembly mold and a demoulding method thereof. Background Art

[0002] With the continuous improvement of safety awareness in modern society, helmets, as an important personal protective equipment, have an increasing market demand and are widely used in many fields such as motorcycles, bicycles, extreme sports, industrial safety, etc.

[0003] Helmets are mostly made of injection molding, which has a relatively low cost. However, with the increasing requirements for helmet performance, such as lightweight, high strength, impact resistance, and wearing comfort, the design and optimization of injection molding molds has become particularly important.

[0004] The molding mold includes an upper mold group and a lower mold group, and the molds need to be closed before injection molding. Insufficient manufacturing precision of the upper mold group and the lower mold group may lead to poor sealing between the upper mold group and the lower mold group after closing the mold, or the injection pressure may cause a gap between the upper mold base and the lower mold base during the injection molding process. The poor sealing effect causes the molten plastic to flow out of the molding mold, resulting in the model being scrapped after the mold is opened, thus resulting in a high scrap rate. Summary of the invention

[0005] The embodiment of the present invention provides a helmet molding assembly mold and a demoulding method thereof, aiming to reduce the scrap rate of molding.

[0006] In a first aspect, an embodiment of the present invention provides a helmet forming assembly mold, which is placed on a workbench and includes:

[0007] The upper die set comprises an upper die seat, a concave die is provided on one side of the upper die seat, a sealing ring surrounds the circumference of the concave die port, and the sealing ring is fixed to the upper die seat;

[0008] A lower die assembly, comprising a lower die seat arranged opposite to the upper die seat and fixed to the surface of the workbench, wherein a convex die is fixed to the side wall of the lower die seat facing the concave die;

[0009] A connecting unit, comprising a plurality of inserting parts connected to the peripheral side wall of the upper die base, and a connecting block corresponding to the inserting parts one by one and arranged on the lower die base; the connecting block has a connecting cavity plugged and adapted to the inserting parts, a limiting unit is arranged in the connecting cavity, the limiting unit has two states of passing through the inserting parts and not passing through the inserting parts, and the limiting unit is used to fix the inserting parts and the lower die base;

[0010] Wherein, after mold closing, the limiting unit is in a state of passing through the insertion portion, and before mold opening, the limiting unit is in a state of not passing through the insertion portion.

[0011] In combination with the first aspect, in a possible implementation, the lower die base is provided with connection grooves corresponding to the connection blocks one by one, the connection grooves have a first feed section located at the top of the connection grooves and a second feed section located at the bottom of the connection grooves, and the peripheral side walls of the upper die base are fixedly provided with extension plates;

[0012] The connecting unit further comprises a connecting rod forming the inserting portion, one end of the connecting rod is plugged and adapted to the connecting cavity, and the other end of the connecting rod is rotatably connected to the extension plate around its own central axis;

[0013] The connecting unit also includes a translation part and a rotation part. When the mold is closed, the translation part drives the upper mold group to move in the direction close to the lower mold group. When the connecting rod is inserted into the connecting cavity and the limiting unit is in a state of passing through the connecting rod, the rotation part drives the connecting rod to rotate and screws the connecting block into the second feed section; when the mold is opened, the translation part drives the upper mold group to move in the direction away from the lower mold group, and at the same time, the rotation part drives the connecting rod to rotate and drives the connecting block to retract upward to the first feed section, and then the limiting unit is in a state of not passing through the connecting rod, and finally the connecting rod is pulled out of the connecting cavity.

[0014] In combination with the first aspect, in a possible implementation, the rotating part includes a transmission rack fixedly arranged on the surface of the workbench, a transmission gear meshing with the transmission rack, and a transmission roller rotatably connected to the extension plate around its own central axis and fixed to the transmission gear, one end of the transmission rack is a flat section without teeth, the other end of the transmission rack is a transmission section with teeth, and the transmission roller is transmission-connected to the connecting rod;

[0015] Among them, when the mold is closed, the connecting rod is inserted into the connecting cavity, the transmission gear moves along the flat section, and when the limiting unit is in a state of passing through the connecting rod, the transmission gear starts to engage with the transmission section; when the mold is opened, the connecting block is retracted to the first feed section, the transmission gear engages with the transmission section, and when the limiting unit is in a state of not passing through the connecting rod, the transmission gear starts to move along the flat section.

[0016] In combination with the first aspect, in a possible implementation, baffles are fixedly provided on both sides of the transmission rack and are arranged along the moving direction of the upper mold base, and the baffles are used to limit the moving direction of the transmission gear.

[0017] In combination with the first aspect, in a possible implementation, the limiting unit includes a power member and a limiting rod, the power member is fixed in the connecting cavity, one end of the limiting rod is fixed to the power member, and an outer wall of the connecting rod is penetrated to form a limiting hole for the limiting rod to pass through;

[0018] Among them, when the mold is closed, after the connecting rod is inserted into the connecting cavity, the power part is started to insert the limit rod into the limit hole; when the mold is opened, after the rotating part is retracted to the first feeding section, the power part is started to pull the limit rod out of the limit hole.

[0019] In combination with the first aspect, in a possible implementation, a position sensor communicatively connected to the power member is disposed at the top of the connection groove and the bottom of the connection cavity;

[0020] When the position sensor located at the top of the connecting groove detects that the connecting block is retracted to the first feed section, the power piece starts to pull the limit rod out of the limit hole; when the position sensor located at the bottom of the connecting cavity detects that the connecting rod is inserted into the bottom of the connecting cavity, the power piece starts to insert the limit rod into the limit hole.

[0021] In combination with the first aspect, in a possible implementation, the translation part includes a base arranged on the side of the upper mold base facing away from the lower mold base and a telescopic member arranged between the base and the upper mold base, the base is fixed to the surface of the workbench, and the telescopic member is used to drive the upper mold base to move closer to or away from the lower mold base.

[0022] In combination with the first aspect, in a possible implementation, a movable seat is fixedly provided on a side of the upper die seat away from the lower die assembly, and a temperature rising channel is penetrated through a side wall of the movable seat toward the upper die seat;

[0023] The helmet forming assembly mold also includes a constant temperature unit arranged in the temperature rising channel, and the constant temperature unit includes an electric heating pipe, and the temperature of the electric heating pipe rises after being energized.

[0024] In combination with the first aspect, in a possible implementation, an injection tube connected to the heating channel is fixedly provided on the side of the movable seat facing away from the upper mold seat, and a temperature sensor communicatively connected to the electric heating tube is installed in the injection tube, and the temperature sensor is used to detect the temperature in the injection tube.

[0025] In a second aspect, an embodiment of the present invention further provides a method for demoulding a helmet, including a helmet molding assembly mold, and the steps are as follows:

[0026] S1, before mold closing, apply a mold release agent on the surface of the concave mold and the convex mold, and close the mold after the mold release agent is applied;

[0027] S2, after the curing time reaches the preset time, the mold is first cooled down and then the upper mold assembly and the lower mold assembly are slowly separated, and then the helmet is peeled off from the male mold;

[0028] S3, cleaning the surfaces of the male and female dies.

[0029] Compared with the prior art, the present invention:

[0030] When the mold is closed, the sealing ring is deformed by the extrusion between the upper mold base and the lower mold base. The sealing ring will deform when it is extruded to compensate for the error caused by insufficient processing accuracy. At the same time, the upper mold base and the lower mold base are fixed together by the limit unit to reduce the possibility of a gap between the upper mold base and the lower mold base due to injection pressure fluctuations. The above method improves the sealing between the upper mold base and the lower mold base, reduces the possibility of melt leakage, and thus reduces the scrap rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic diagram of the structure of a helmet forming and assembling mold provided by an embodiment of the present invention;

[0032] Figure 2 This is a partial schematic diagram showing the starting position of the connecting rod according to an embodiment of the present invention;

[0033] Figure 3 This is a partial schematic diagram showing the terminal position of the connecting rod according to an embodiment of the present invention;

[0034] Figure 4 This is a partial cross-sectional view showing the connection method between the connecting rod and the lower die base according to an embodiment of the present invention;

[0035] Figure 5 This is a system guide diagram showing the relationship between the power component and the position sensor according to an embodiment of the present invention;

[0036] Figure 6 It is a partial cross-sectional view of a constant temperature unit according to an embodiment of the present invention;

[0037] Figure 7 This is a system guide diagram showing the relationship between the electric heating tube and the temperature sensor according to an embodiment of the present invention.

[0038] Description of reference numerals:

[0039] 10. Upper die set; 101. Upper die base; 1011. Sealing ring; 102. Concave die;

[0040] 20, lower die assembly; 201, lower die base; 2011, connecting groove; 2012, extension plate; 20121, avoidance groove; 202, punch;

[0041] 30, inserting part; 301, connecting rod; 3011, limiting hole; 302, connecting block; 3021, connecting cavity; 3022, receiving groove;

[0042] 40. Limiting unit; 401. Power member; 402. Limiting rod;

[0043] 50, translation part; 501, base; 502, telescopic member;

[0044] 60, rotating part; 601, transmission rack; 6011, baffle; 602, transmission gear; 603, transmission roller;

[0045] 70. Workbench;

[0046] 80, moving seat; 801, heating channel; 802, injection pipe;

[0047] 90. Constant temperature unit; 901. Electric heating tube; 902. Material guide barrel. DETAILED DESCRIPTION

[0048] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0049] Please also read Figures 1 to 7 , the helmet forming assembly mold of the present invention is described. The helmet forming assembly mold is placed on a workbench 70, and includes an upper mold group 10, a lower mold group 20 and a connecting unit. The upper mold group 10 has an upper mold base 101, and a concave mold 102 is opened on one side of the upper mold base 101. A sealing ring 1011 surrounds the peripheral side of the port of the concave mold 102, and the sealing ring 1011 is fixed to the upper mold base 101; the lower mold group 20 has a lower mold base 201 arranged opposite to the upper mold base 101 and fixed to the surface of the workbench 70, and the lower mold base 201 faces the side of the concave mold 102. A punch 202 is fixed to the wall; the connecting unit has a plurality of insertion parts 30 connected to the peripheral side walls of the upper die base 101, and a connecting block 302 corresponding to the insertion parts 30 and arranged on the lower die base 201; the connecting block 302 has a connecting cavity 3021 that is plugged and adapted to the insertion part 30, and a limiting unit 40 is arranged in the connecting cavity 3021. The limiting unit 40 has two states of passing through the insertion part 30 and not passing through the insertion part 30, and the limiting unit 40 is used to fix the insertion part 31 and the lower die base 201.

[0050] The limiting unit 40 is in a state of passing through the inserting portion 30 after the mold is closed, and the limiting unit 40 is in a state of not passing through the inserting portion 30 before the mold is opened.

[0051] It should be noted that Figure 1 The left side is up, Figure 1 The right side is down.

[0052] This embodiment, compared with the prior art:

[0053] When the mold is closed, the sealing ring 1011 is deformed by the extrusion between the upper mold base 101 and the lower mold base 201. The sealing ring 1011 is deformed when being extruded to compensate for the error caused by insufficient processing precision. At the same time, the upper mold base 101 and the lower mold base 201 are fixed together by the limit unit 40, reducing the possibility of a gap between the upper mold base 101 and the lower mold base 201 due to injection pressure fluctuations. The above method improves the sealing between the upper mold base 101 and the lower mold base 201, reduces the possibility of melt leakage, and thus reduces the scrap rate.

[0054] In some embodiments, see Figure 1-Figure 4 The lower die base 201 is provided with a connecting groove 2011 corresponding to the connecting block 302 one by one. The connecting groove 2011 has a first feed section located at the top of the connecting groove 2011 and a second feed section located at the bottom of the connecting groove 2011. An extension plate 2012 is fixedly provided on the peripheral side wall of the upper die base 101.

[0055] The connection unit further includes a connection rod 301 forming the insertion portion 30 , one end of the connection rod 301 is plugged and fitted into the connection cavity 3021 , and the other end of the connection rod 301 is rotatably connected to the extension plate 2012 around its own central axis.

[0056] The connecting unit also includes a translation part 50 and a rotation part 60. When the mold is closed, the translation part 50 drives the upper mold group 10 to move toward the direction close to the lower mold group 20. When the connecting rod 301 is inserted into the connecting cavity 3021 and the limiting unit 40 is in a state of passing through the connecting rod 301, the rotation part 60 drives the connecting rod 301 to rotate and screws the connecting block 302 into the second feed section; when the mold is opened, the translation part 50 drives the upper mold group 10 to move away from the lower mold group 20. At the same time, the rotation part 60 drives the connecting rod 301 to rotate and drives the connecting block 302 to retract upward to the first feed section, and then the limiting unit 40 is in a state of not passing through the connecting rod 301, and finally the connecting rod 301 is pulled out of the connecting cavity 3021.

[0057] It should be noted that the connection block 302 is plug-fitted with the lower die base 201 in the first feeding section, and the connection block 302 is thread-fitted with the lower die base 201 in the second feeding section.

[0058] After moving the upper mold base 101 to insert the connecting rod 301 into the connecting cavity 3021, the limiting unit 40 passes through the connecting rod 301, and then the connecting rod 301 rotates to drive the connecting block 302 to rotate, thereby screwing the connecting block 302 into the connecting groove 2011, thereby making the sealing ring 1011 further squeezed by the upper mold base 101 and the lower mold base 201, thereby reducing the possibility of a gap between the upper mold base 101 and the lower mold base 201.

[0059] In some embodiments, see Figure 2 and Figure 3The rotating part 60 includes a transmission rack 601 fixed to the surface of the workbench 70, a transmission gear 602 meshing with the transmission rack 601, and a transmission roller 603 rotatably connected to the extension plate 2012 around its own central axis and fixed to the transmission gear 602. One end of the transmission rack 601 is a flat section without teeth, and the other end of the transmission rack 601 is a transmission section with teeth. The transmission roller 603 is connected to the connecting rod 301 in transmission.

[0060] Among them, when the mold is closed, the connecting rod 301 is inserted into the connecting cavity 3021, and the transmission gear 602 moves along the flat section. When the limiting unit 40 is in a state of passing through the connecting rod 301, the transmission gear 602 begins to engage with the transmission section; when the mold is opened, the connecting block 302 is retracted to the first feed section, and the transmission gear 602 engages with the transmission section. When the limiting unit 40 is in a state of not passing through the connecting rod 301, the transmission gear 602 begins to move along the flat section.

[0061] Specifically, the transmission roller 603 and the connecting rod 301 are meshed and transmitted via a bevel gear set.

[0062] The upper die base 101 is moved so that it approaches the lower die base 201. At this time, the transmission gear 602 is not engaged with the transmission section. When the connecting rod 301 is inserted into the connecting cavity 3021 and the limiting unit 40 is in a state of passing through the connecting rod 301, the transmission gear 602 begins to engage with the transmission section. As a result, when the upper die base 101 continues to move closer to the lower die base 201, the transmission gear 602 rolls along the transmission rack 601, so that the transmission gear 602 drives the transmission roller 603 to rotate, and the transmission roller 603 drives the connecting rod 301 to rotate through the bevel gear set. At this time, the connecting rod 301 is fixed together with the connecting block 302 through the limiting unit 40, so that when the connecting rod 301 rotates, it will drive the connecting block 302 to rotate, and then screw the connecting block 302 into the second feed section.

[0063] The upper die base 101 is moved so that the upper die base 101 is away from the lower die base 201. At this time, the transmission gear 602 is meshed with the transmission section, and the limit unit 40 is in a state of passing through the connecting rod 301. The transmission gear 602 rolls along the transmission rack 601, which will drive the transmission roller 603 to reverse. The transmission roller 603 drives the connecting rod 301 to reverse through the bevel gear set, thereby retracting the connecting block 302 from the second feed section to the first feed section, and then the limit unit 40 will switch to a state where it does not pass through the connecting rod 301; when the upper die base 101 continues to move away from the lower die base 201, the upper die base 101 pulls the connecting rod 301 out of the connecting cavity 3021 through the extension plate 2012.

[0064] In some embodiments, see Figure 2 Baffles 6011 are fixedly provided on both sides of the transmission rack 601 along the movement direction of the upper mold base 201 , and the baffles 6011 are used to limit the movement direction of the transmission gear 602 .

[0065] The transmission gear 602 is guided by the baffle 6011 to reduce the possibility of the transmission gear 602 being out of engagement with the transmission section, thereby improving the stability of the movement of the transmission gear 602.

[0066] In some embodiments, see Figure 4 and Figure 5 The limiting unit 40 includes a power piece 401 and a limiting rod 402. The power piece 401 is fixed in the connecting cavity 3021. One end of the limiting rod 402 is fixed to the power piece 401. The outer wall of the connecting rod 301 is penetrated by a limiting hole 3011 for the limiting rod 402 to pass through.

[0067] Among them, when the mold is closed, after the connecting rod 301 is inserted into the connecting cavity 3021, the power part 401 is started to insert the limiting rod 402 into the limiting hole 3011; when the mold is opened, after the rotating part 60 is retracted to the first feeding section, the power part 401 is started to pull the limiting rod 402 out of the limiting hole 3011.

[0068] Specifically, a receiving groove 3023 for installing the power component 401 is formed on the inner wall of the connecting cavity 3021 . The power component 401 may be an electric cylinder.

[0069] Specifically, position sensors that are communicatively connected to the power piece 401 are disposed at the top of the connection groove 2011 and the bottom of the connection cavity 3021 .

[0070] When the position sensor located at the top of the connecting groove 2011 detects that the connecting block 302 is retracted to the first feeding section, the power piece 401 starts to pull the limiting rod 402 out of the limiting hole 3011; when the position sensor located at the bottom of the connecting cavity 3021 detects that the connecting rod 301 is inserted into the bottom of the connecting cavity 3021, the power piece 401 starts to insert the limiting rod 402 into the limiting hole 3011.

[0071] Two position sensors are provided to respectively monitor the time nodes of the connecting rod 301 being inserted into the connecting cavity 3021 and the connecting block 302 being retracted from the second feeding section to the first feeding section, so as to determine the starting timing of the power part 401, and automatic mold closing and opening are realized without manual operation.

[0072] In some embodiments, see Figure 1 The translation part 50 includes a base 501 disposed on the side of the upper mold base 101 away from the lower mold base 201 and a telescopic member 502 disposed between the base 501 and the upper mold base 101. The base 501 is fixed to the surface of the workbench 70, and the telescopic member 502 is used to drive the upper mold base 101 to move closer to or away from the lower mold base 201.

[0073] It should be noted that the telescopic member 502 can be a telescopic oil cylinder. Two telescopic oil cylinders are provided. The two telescopic oil cylinders are horizontally spaced apart and arranged between the base 501 and the workbench 70 , and the piston rod ends of the telescopic oil cylinders are fixed to the upper mold base 101 .

[0074] When the piston rod of the telescopic oil cylinder is extended, the base 501 drives the upper die base 101 to move closer to the lower die base 201; when the piston rod of the telescopic oil cylinder is retracted, the base 501 drives the upper die base 101 away from the lower die base 201. The piston rod of the telescopic oil cylinder keeps stable and slow during movement, which reduces damage to the model and further reduces the scrap rate.

[0075] In some embodiments, see Figure 1 and Figure 6 A movable seat 80 is fixedly provided on the side of the upper mold base 101 facing away from the lower mold assembly 20 , and a temperature rising channel 801 is penetrated through the side wall of the movable seat 80 facing the upper mold base 101 .

[0076] The helmet forming assembly mold also includes a constant temperature unit 90 arranged in the temperature rising channel 801. The constant temperature unit 90 includes an electric heating pipe 901. The temperature of the electric heating pipe 901 rises after being energized.

[0077] It should be noted that an injection port communicating with the female mold 102 is formed on the top wall of the upper mold base 101 , and the temperature rising channel 801 is communicated with the injection port.

[0078] Specifically, the constant temperature unit 90 also includes two material guide barrels 902, which are respectively fixed at the two ends of the electric heating tube 901. The inner diameter of one end of the material guide barrel 902 close to the electric heating tube 901 is smaller than the inner diameter of the other end of the material guide barrel 902 away from the electric heating tube 901, and the end of the material guide barrel 902 away from the electric heating tube 901 is fixed to the inner wall of the temperature rising channel 801.

[0079] The temperature of the molten plastic will gradually decrease during the transportation process. After the heating channel 801 is added, the molten plastic will be heated by the electric heating pipe 901 before entering between the male mold 202 and the female mold 102, so that the molten plastic can maintain the optimal temperature before molding, thereby improving the molding quality.

[0080] In some embodiments, see Figure 6 and Figure 7 An injection pipe 802 connected to the heating channel 801 is fixedly provided on the side of the movable seat 80 away from the upper mold seat 101. A temperature sensor connected to the electric heating pipe 901 is installed in the injection pipe 802. The temperature sensor is used to detect the temperature in the injection pipe 802.

[0081] The temperature sensor monitors the temperature of the melt in the injection tube 802 and determines the working power of the electric heating tube 901 according to the difference between the melt temperature and the optimum temperature. The smaller the difference is, the minimum the working power of the electric heating tube 901 is, thereby reducing energy consumption while ensuring that the melt is heated to the optimum temperature.

[0082] Based on the same inventive concept, the present application also provides a demoulding method, the steps are as follows:

[0083] S1. Apply a mold release agent on the surface of the concave mold 102 and the convex mold 202 before mold closing, and close the mold after the mold release agent is applied;

[0084] S2, after the curing time reaches the preset time, the mold is first cooled down and then the upper mold assembly 10 and the lower mold assembly 20 are slowly separated, and then the helmet is peeled off from the male mold 202;

[0085] S3, cleaning the surfaces of the male die 202 and the female die 102.

[0086] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A helmet forming assembly mold, placed on a workbench, characterized in that: include: The upper die set comprises an upper die seat, a concave die is provided on one side of the upper die seat, a sealing ring surrounds the circumference of the concave die port, and the sealing ring is fixed to the upper die seat; A lower die assembly, comprising a lower die seat arranged opposite to the upper die seat and fixed to the surface of the workbench, wherein a convex die is fixed to the side wall of the lower die seat facing the concave die; A connecting unit, comprising a plurality of inserting parts connected to the peripheral side wall of the upper die base, and a connecting block corresponding to the inserting parts one by one and arranged on the lower die base; the connecting block has a connecting cavity plugged and adapted to the inserting parts, a limiting unit is arranged in the connecting cavity, the limiting unit has two states of passing through the inserting parts and not passing through the inserting parts, and the limiting unit is used to fix the inserting parts and the lower die base; Wherein, after the mold is closed, the limiting unit is in a state of passing through the insertion portion, and before the mold is opened, the limiting unit is in a state of not passing through the insertion portion; The lower die base is provided with connection grooves corresponding to the connection blocks one by one, the connection grooves have a first feed section located at the top of the connection grooves and a second feed section located at the bottom of the connection grooves, and the peripheral side wall of the upper die base is fixed with an extension plate; The connecting unit further comprises a connecting rod forming the inserting portion, one end of the connecting rod is plugged and adapted to the connecting cavity, and the other end of the connecting rod is rotatably connected to the extension plate around its own central axis; The connecting unit further comprises a translation part and a rotation part. When the mold is closed, the translation part drives the upper mold group to move in a direction close to the lower mold group. When the connecting rod is inserted into the connecting cavity and the limiting unit is in a state of passing through the connecting rod, the rotation part drives the connecting rod to rotate and screws the connecting block into the second feeding section. When the mold is opened, the translation part drives the upper mold group to move in a direction away from the lower mold group. At the same time, the rotation part drives the connecting rod to rotate and drives the connecting block to be retracted upward to the first feeding section. Then the limiting unit is in a state of not passing through the connecting rod. Finally, the connecting rod is pulled out of the connecting cavity. The rotating part includes a transmission rack fixedly arranged on the surface of the workbench, a transmission gear meshing with the transmission rack, and a transmission roller rotatably connected with the extension plate around its own central axis and fixedly connected with the transmission gear, one end of the transmission rack is a flat section without teeth, the other end of the transmission rack is a transmission section with teeth, and the transmission roller is transmission-connected with the connecting rod; Among them, when the mold is closed, the connecting rod is inserted into the connecting cavity, the transmission gear moves along the flat section, and when the limiting unit is in a state of passing through the connecting rod, the transmission gear starts to engage with the transmission section; when the mold is opened, the connecting block is retracted to the first feed section, the transmission gear engages with the transmission section, and when the limiting unit is in a state of not passing through the connecting rod, the transmission gear starts to move along the flat section.

2. The helmet forming assembly mold according to claim 1, characterized in that: Baffles arranged along the moving direction of the upper die seat are fixedly provided on both sides of the transmission rack, and the baffles are used to limit the moving direction of the transmission gear.

3. The helmet forming assembly mold according to claim 1, characterized in that: The limiting unit comprises a power piece and a limiting rod, wherein the power piece is fixed in the connecting cavity, one end of the limiting rod is fixed to the power piece, and a limiting hole for the limiting rod to pass through is formed through the outer wall of the connecting rod; Wherein, when the mold is closed, after the connecting rod is inserted into the connecting cavity, the power part is started to insert the limiting rod into the limiting hole; when the mold is opened, after the connecting block is retracted to the first feeding section, the power part is started to pull the limiting rod out of the limiting hole.

4. The helmet forming assembly mold according to claim 3, characterized in that: The top of the connecting groove and the bottom of the connecting cavity are both provided with position sensors which are in communication connection with the power member; When the position sensor located at the top of the connecting groove detects that the connecting block is retracted to the first feed section, the power piece starts to pull the limit rod out of the limit hole; when the position sensor located at the bottom of the connecting cavity detects that the connecting rod is inserted into the bottom of the connecting cavity, the power piece starts to insert the limit rod into the limit hole.

5. The helmet forming assembly mold according to claim 1, characterized in that: The translation part includes a base arranged on the side of the upper mold base away from the lower mold base and a telescopic member arranged between the base and the upper mold base. The base is fixed to the workbench surface, and the telescopic member is used to drive the upper mold base to move closer to or away from the lower mold base.

6. The helmet forming and assembling mold according to claim 1, characterized in that: A movable seat is fixedly provided on a side of the upper die seat away from the lower die set, and a temperature-raising channel is formed through the side wall of the movable seat toward the upper die seat; The helmet forming assembly mold also includes a constant temperature unit arranged in the temperature rising channel, and the constant temperature unit includes an electric heating pipe, and the temperature of the electric heating pipe rises after being energized.

7. The helmet forming assembly mold according to claim 6, characterized in that: An injection pipe connected to the heating channel is fixedly arranged on the movable seat away from the upper mold seat, and a temperature sensor connected to the electric heating pipe is installed in the injection pipe, and the temperature sensor is used to detect the temperature in the injection pipe.

8. A method for demoulding a helmet, comprising the helmet molding assembly mold according to claims 1 to 7, characterized in that: Here are the steps: S1, before mold closing, apply a mold release agent on the surface of the concave mold and the convex mold, and close the mold after the mold release agent is applied; S2, after the curing time reaches the preset time, the mold is first cooled down and then the upper mold assembly and the lower mold assembly are slowly separated, and then the helmet is peeled off from the male mold; S3, cleaning the surfaces of the male and female dies.

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