Environment-friendly automobile hardware production mold

By introducing slide bars, hydraulic cylinders, gear racks, and vacuum suction cups into the production molds for automotive hardware parts, the problem of inconvenient mold base replacement has been solved, enabling rapid mold replacement and efficient removal of stamped parts, thereby improving production efficiency and ease of operation.

CN223603293UActive Publication Date: 2025-11-28DONGGUAN JIYIXIN TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202423215946.8
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-12-25
Publication Date
2025-11-28
Estimated Expiration
2034-12-25

AI Technical Summary

Technical Problem

Existing automotive hardware production molds are inconvenient to disassemble and replace mold bases when changing to different shapes, which reduces the practicality of the production molds.

Method used

A mold structure including a slide bar, a hydraulic cylinder, a gear rack, a motor, and a vacuum suction cup was designed. The upper stamping seat is driven to press down by the hydraulic cylinder, the gear is driven to rotate by the motor, and the rack slides to achieve the opposite movement of the mold base. The stamped part is removed by the vacuum suction cup, simplifying the mold base replacement process.

Benefits of technology

It enables rapid replacement of mold bases and efficient removal of stamped parts, improving production efficiency and ease of operation.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides a kind of environmental protection automobile hardware production mould, belong to production mould technical field.This kind of environmental protection automobile hardware production mould, including main body, drive mechanism and material taking mechanism, main body includes lower punch holder, the upper end of lower punch holder is installed with a pair of slide bar, the upper end between a pair of slide bar is connected with top plate, and a pair of slide bar is slidably sleeved with upper punch holder between, the upper end of top plate is connected with hydraulic cylinder, the output end of hydraulic cylinder penetrates top plate, and is connected with the upper end of upper punch holder, the upper end surface both sides of lower punch holder are slidably connected with first clamping seat, lower die holder is equipped between a pair of first clamping seat, the bottom end surface both sides of upper punch holder are slidably connected with second clamping seat, and upper die holder is equipped between a pair of second clamping seat, drive mechanism includes a pair of crosspieces, a pair of crosspieces are respectively arranged in the inside of lower punch holder and upper punch holder, the utility model, can effectively improve the practicality of environmental protection automobile hardware production mould, with higher practical value.
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Description

TECHNICAL FIELD

[0001] The utility model relates to production mould technical field, specifically, relate to a kind of environmental protection automobile hardware production mould. BACKGROUND

[0002] Automobile hardware refers to the metal stamping parts that constitute automobile parts. These parts are made by stamping process, and part of them can be used directly as automobile parts, while another part needs to be subjected to subsequent processes such as welding, machining or painting to become automobile parts. Stamping process is a metal processing method, which applies pressure to metal sheet through die to make it deform plastically, thereby producing parts of desired shape. This process is suitable for mass production of parts of the same shape and size, because stamping parts have high production efficiency and low cost. Automobile hardware stamping parts play an important role in automobile manufacturing, covering various aspects from body structure parts to functional parts, and are indispensable components of automobiles.

[0003] A kind of environmental protection automobile hardware production mould is disclosed in Chinese patent with publication number CN207431069U, comprising production mould main body, the production mould main body is by being arranged at the one side of this production mould main body stamping box and the transmission mechanism of being arranged at the bottom end of stamping box, and the transmission machine is tightly welded with stamping box, the side surface of the transmission machine is equipped with multiple evenly distributed Y355 electric motor, and the Y355 electric motor is symmetrically distributed between, and is embedded in the transmission machine, this kind of environmental protection automobile hardware production mould, stamping box and transmission machine are assembled and designed, when production mould main body is carried out stamping production to automobile hardware, transmission machine is transmitted to hardware original piece, when being transmitted to the bottom end of stamping tool, stamping tool directly carries out stamping treatment to hardware, not only is favorable to improve the work efficiency of production mould main body, and facilitate the operation of staff;

[0004] The technical solution described in this scheme is not convenient for disassembling and replacing the upper and lower die seats of the mould in actual use. Since there are many types of hardware shapes, when stamping hardware of different shapes is needed, different types of production moulds need to be replaced, thereby reducing the practicality of the production mould. UTILITY MODEL CONTENT

[0005] To solve the above technical problems, the utility model embodiment provides an environmental protection automobile hardware production mould, which is realized by the following technical solutions:

[0006] The utility model provides an environmental protection automobile hardware production mould, including main part, drive mechanism and material taking mechanism, the main part includes lower punch holder, the upper end of lower punch holder is installed with a pair of slide rod, and the upper end between a pair of slide rod is connected with the top plate, and a pair of slide rod is slidably sleeved with upper punch holder, the upper end of top plate is connected with hydraulic cylinder, the output of hydraulic cylinder penetrates top plate and is connected with the upper end of upper punch holder, the upper end surface both sides of lower punch holder are slidably connected with first clamping base, and the lower die holder is equipped between a pair of first clamping base, the bottom end surface both sides of upper punch holder are slidably connected with second clamping base, and the upper die holder is equipped between a pair of second clamping base, the drive mechanism includes a pair of horizontal plate, and a pair of horizontal plate is arranged in the inside of lower punch holder and upper punch holder respectively.

[0007] Further, a pair of bearings are embedded in the inner center of a pair of horizontal plates, a pair of shafts are connected inside a pair of bearings, a pair of gears are sleeved outside one end of a pair of shafts, and a pair of racks are meshingly connected outside both sides of a pair of gears.

[0008] The beneficial effect of the above further scheme is that by providing a pair of shafts, since a pair of shafts are sleeved with gears outside, the number of gears is two, when the shaft rotates, it is convenient to realize the rotation of the gear, so that the racks meshed outside both sides of the gear realize opposite movement.

[0009] Further, the bottom end of a pair of first clamping bases is connected with one side of the upper end of a pair of racks, the upper end of a pair of second clamping bases is connected with one side of the bottom end of another pair of racks, a pair of slide bars are connected with the upper end and the bottom end of a pair of horizontal plates, and a pair of slide bars are slidably connected inside a pair of racks, and one side of the outer wall of the slide bar is connected with one side of the outer wall of the horizontal plate.

[0010] The beneficial effect of the above further scheme is that by providing two pairs of racks, one side of the upper end of one pair of racks is connected with the bottom end of a pair of first clamping bases, and one side of the bottom end of another pair of racks is connected with the upper end of a pair of second clamping bases, when a pair of racks in the lower punch holder or the upper punch holder move oppositely, it is convenient to realize the opposite movement of a pair of first clamping bases or a pair of second clamping bases, and at the same time, by providing a slide bar, the slide bar is T-shaped, which is convenient for the movement of the rack to be more stable, and the bottom end of the slide bar inside a pair of racks in the lower punch holder is connected with the upper end of the horizontal plate in the lower punch holder, and the upper end of the slide bar inside a pair of racks in the upper punch holder is connected with the bottom end of the horizontal plate in the upper punch holder.

[0011] Further, a pair of motors are connected with the upper end and the bottom end of a pair of horizontal plates, and the output of the motor is drivingly connected with the shaft through a shaft coupling.

[0012] The beneficial effect of the above further scheme is that by providing a pair of motors, when the motor works, it is convenient to realize the rotation of the shaft.

[0013] Further, the lower die seat is provided with a pair of first insertion holes on both sides of the outer part, and a first insertion rod is arranged in each of the first insertion holes.

[0014] The beneficial effect of the above further scheme is that by arranging the first insertion holes and the first insertion rods, the number of the first insertion holes and the first insertion rods is four, and when the pair of first clamping seats move towards both sides, the first insertion rods and the first insertion holes can be separated, and the subsequent replacement of the lower die seat is facilitated.

[0015] Further, the upper die seat is provided with a pair of second insertion holes on both sides of the outer part, and a second insertion rod is arranged in each of the second insertion holes.

[0016] The beneficial effect of the above further scheme is that by arranging the second insertion holes and the second insertion rods, the number of the second insertion holes and the second insertion rods is four, and when the pair of second clamping seats move towards both sides, the second insertion rods and the second insertion holes can be separated, and the subsequent replacement of the upper die seat is facilitated.

[0017] Further, the material taking mechanism comprises a U-shaped plate, the U-shaped plate is arranged on the back of the lower stamping seat, a plane bearing is arranged in the U-shaped plate, a U-shaped electric turntable is connected to the inside of the plane bearing, an extension rod is connected to the upper end of the U-shaped electric turntable, and a mounting plate is connected to the output end of the extension rod.

[0018] The beneficial effect of the above further scheme is that by arranging the U-shaped plate, the electric turntable can be installed, and since the extension rod is connected to the electric turntable, when the electric turntable works, the extension rod and the mounting plate can be rotated, and by arranging the extension rod, when the extension rod is started, the mounting plate can be lifted and lowered.

[0019] Further, a communication pipe is connected to the bottom end of the mounting plate, a vacuum suction cup is connected to the bottom end of the communication pipe, a vacuum pump is connected to the upper end of the mounting plate, the input end of the vacuum pump penetrates through the mounting plate and is connected to one end of the communication pipe.

[0020] The beneficial effect of the above further scheme is that by arranging the vacuum pump and connecting the input end of the vacuum pump to the vacuum suction cup through the communication pipe, when the vacuum suction cup contacts the stamped hardware, the vacuum pump works to make the contact part of the vacuum suction cup and the hardware in a vacuum state, and then through the extension rod and the electric turntable, the mounting plate returns to the original position, and the hardware can be taken out from the lower die seat.

[0021] The utility model discloses a beneficial effect is: the utility model discloses a kind of environmental protection automobile hardware production mould, the environmental protection automobile hardware production mould of this kind, by slidingly being equipped with upper punch seat between slide bar, it can slide between slide bar, by setting hydraulic cylinder, when hydraulic cylinder starts, it is convenient to push upper punch seat and press down, the plate material placed on lower die holder is stamped, when needing to replace upper die holder and lower die holder, by starting a pair of motor, make a pair of rotating shafts rotate, realize a pair of gear rotation, so that rack meshed on the both sides of gear outside moves steadily to both sides under the action of slide bar, when a pair of rack in lower punch seat and upper punch seat moves to both sides, it is convenient to realize the opposite movement of a pair of first clamping seat and a pair of second clamping seat, when a pair of first clamping seat moves to both sides, it is convenient to realize the separation of first inserting rod and first insertion hole, and then it is convenient to replace lower die holder subsequently, when a pair of second clamping seat moves to both sides, it is convenient to realize the separation of second inserting rod and second insertion hole, and then it is convenient to replace upper die holder subsequently. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will be briefly introduced to the drawing needed to be used in the embodiment, should understand, the following drawing only shows some embodiments of the utility model, therefore should not be regarded as the limitation to the scope, for ordinary skilled person in the art, under the premise of not paying creative labor, can also obtain other related drawings according to these drawings.

[0023] Figure 1 The utility model provides a kind of environmental protection automobile hardware production mould's three-dimensional structure schematic diagram Figure 1 ;

[0024] Figure 2 The utility model provides a kind of environmental protection automobile hardware production mould's three-dimensional structure schematic diagram Figure 2 ;

[0025] Figure 3 The utility model provides a kind of environmental protection automobile hardware production mould's three-dimensional structure schematic diagram of material taking mechanism

[0026] Figure 4 The utility model provides a kind of environmental protection automobile hardware production mould's lower punch seat and upper punch seat's explosion three-dimensional structure schematic diagram

[0027] Figure 5 The utility model provides a kind of environmental protection automobile hardware production mould's three-dimensional structure schematic diagram of clamping mechanism.

[0028] As shown in the figure: 100, the main body; 1001, the lower stamping seat; 1002, the sliding rod; 1003, the top plate; 1004, the hydraulic cylinder; 1005, the upper stamping seat; 1006, the first clamping seat; 1007, the lower die seat; 1008, the first insertion hole; 1009, the first insertion rod; 1010, the second clamping seat; 1011, the upper die seat; 1012, the second insertion hole; 1013, the second insertion rod; 200, the driving mechanism; 2001, the cross plate; 2002, the rotating shaft; 2003, the gear; 2004, the sliding bar; 2005, the rack; 2006, the motor; 300, the material taking mechanism; 3001, the U-shaped plate; 3002, the electric rotating disc; 3003, the telescopic rod; 3004, the mounting plate; 3005, the communication pipe; 3006, the vacuum chuck; 3007, the vacuum pump. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0030] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0031] Embodiment one

[0032] The present application provides the following technical solutions: as Figures 1-5As shown, an environmentally friendly automobile hardware production mold, including main body 100, drive mechanism 200 and taking mechanism 300, main body 100 includes lower punch seat 1001, the upper end of lower punch seat 1001 is installed with a pair of slide rods 1002, a pair of slide rods 1002 is connected between the upper end of the top plate 1003, and a pair of slide rods 1002 is slidably sleeved with upper punch seat 1005, the upper end of the top plate 1003 is connected with hydraulic cylinder 1004, the output end of hydraulic cylinder 1004 penetrates the top plate 1003, and is connected with the upper end of the upper punch seat 1005, the upper end surface of the lower punch seat 1001 is slidably connected with the first clamping seat 1006 on both sides, a pair of first clamping seat 1006 is provided between the lower die seat 1007, the bottom end surface of the upper punch seat 1005 is slidably connected with the second clamping seat 1010 on both sides, a pair of second clamping seat 1010 is provided between the upper die seat 1011, drive mechanism 200 includes a pair of horizontal plate 2001, a pair of horizontal plate 2001 is arranged in the lower punch seat 1001 and the upper punch seat 1005 respectively, by slidingly sleeving the upper punch seat 1005 between the slide rod 1002, so that it can slide between the slide rod 1002, by starting the hydraulic cylinder 1004, it is convenient to push the upper punch seat 1005 down, the plate placed on the lower die seat 1007 is stamped, by setting a pair of first clamping seat 1006 and a pair of second clamping seat 1010, when a pair of first clamping seat 1006 moves towards both sides, it is convenient for subsequent replacement of the lower die seat 1007, when a pair of second clamping seat 1010 moves towards both sides, it is convenient for subsequent replacement of the upper die seat 1011.

[0033] Example two

[0034] Refer to Figures 1-5As shown, the inner center of the pair of horizontal plates 2001 is embedded with a bearing, the inner part of the pair of bearings is connected with a rotating shaft 2002, one end of the pair of rotating shafts 2002 is externally sleeved with a gear 2003, the outer sides of the pair of gears 2003 are meshingly connected with a rack 2005, the bottom end of the pair of first clamping bases 1006 is connected with one side of the upper end of the pair of racks 2005, the upper end of the pair of second clamping bases 1010 is connected with one side of the bottom end of the other pair of racks 2005, the upper end and the bottom end of the pair of horizontal plates 2001 are connected with a pair of slides 2004, the inner part of the two pairs of racks 2005 is slidingly connected with the slide 2004, one side of the outer wall of the slide 2004 is connected with one side of the outer wall of the horizontal plate 2001, the upper end and the bottom end of the pair of horizontal plates 2001 are connected with a motor 2006, the output end of the motor 2006 is drivingly connected with the rotating shaft 2002 through a shaft coupling, by starting the pair of motors 2006, the pair of rotating shafts 2002 rotates, the pair of gears 2003 rotates, the racks 2005 meshing with the outer sides of the gears 2003 stably moves to the two sides under the action of the slide 2004, when the pair of racks 2005 in the lower punching seat 1001 and the upper punching seat 1005 moves to the two sides, the opposite movement of the pair of first clamping bases 1006 and the pair of second clamping bases 1010 is facilitated.

[0035] Example three

[0036] With reference to Figures 1-5As shown, the outer two sides of the lower die seat 1007 are provided with a pair of first insertion holes 1008, the inner sides of the pair of first insertion holes 1008 are provided with a pair of first insertion rods 1009, one end of the pair of first insertion rods 1009 on the same side is connected with one side of the outer wall of the first clamping seat 1006, the outer two sides of the upper die seat 1011 are provided with a pair of second insertion holes 1012, the inner sides of the pair of second insertion holes 1012 are provided with a pair of second insertion rods 1013, one end of the pair of second insertion rods 1013 on the same side is connected with one side of the outer wall of the second clamping seat 1010, the taking mechanism 300 comprises a U-shaped plate 3001, the U-shaped plate 3001 is arranged on the back of the lower stamping seat 1001, the inner side of the U-shaped plate 3001 is embedded with a plane bearing, the inner side of the plane bearing is connected with a U-shaped electric turntable 3002, the upper end of the U-shaped electric turntable 3002 is connected with an extension rod 3003, the output end of the extension rod 3003 is connected with a mounting plate 3004, the bottom end of the mounting plate 3004 is connected with a communication pipe 3005, the bottom end of the communication pipe 3005 is connected with a vacuum chuck 3006, the upper end of the mounting plate 3004 is connected with a vacuum pump 3007, the input end of the vacuum pump 3007 penetrates through the mounting plate 3004 and is connected with one end of the communication pipe 3005, by arranging the first insertion hole 1008 and the first insertion rod 1009, when the first insertion hole 1008 and the first insertion rod 1009 are separated, the subsequent replacement of the lower die seat 1007 is facilitated, by arranging the second insertion hole 1012 and the second insertion rod 1013, when the second insertion hole 1012 and the second insertion rod 1013 are separated, the subsequent replacement of the upper die seat 1011 is facilitated, when the electric turntable 3002 works, the rotation of the extension rod 3003 and the mounting plate 3004 is facilitated, when the extension rod 3003 is started, the descending of the mounting plate 3004 is facilitated, the vacuum chuck 3006 is attached to the surface of the hardware, then the vacuum pump 3007 is started to make the place where the vacuum chuck 3006 is attached to the hardware in a vacuum state, then the extension rod 3003 and the electric turntable 3002 are used to restore the mounting plate 3004 to the original position, the hardware is taken out from the lower die seat 1007.

[0037] Specifically, the working principle of the environmentally-friendly automobile hardware production die is as follows: in use, first, the blanking mechanism 300 is used to place the plate to be punched on the lower die seat 1007, then the hydraulic cylinder 1004 is started to push the upper punching seat 1005 to press down, and the plate placed on the lower die seat 1007 is punched, after the punching is completed, the electric turntable 3002 is started to rotate the telescopic rod 3003 and the mounting plate 3004, when the telescopic rod 3003 is started, the mounting plate 3004 is lowered, the vacuum chuck 3006 is attached to the surface of the hardware, then the vacuum pump 3007 is started to make the vacuum chuck 3006 and the hardware attachment part in a vacuum state, then the telescopic rod 3003 and the electric turntable 3002 are used to restore the mounting plate 3004 to the original position, the hardware is taken out from the lower die seat 1007, when the upper die seat 1011 and the lower die seat 1007 need to be replaced, a pair of motors 2006 are started to rotate a pair of shafts 2002, a pair of gears 2003 are rotated, the racks 2005 meshed with the outer sides of the gears 2003 are stably moved to the two sides under the action of the slide bars 2004, when the lower punching seat 1001 and the upper punching seat 1005 move to the two sides, a pair of first clamping seats 1006 and a pair of second clamping seats 1010 are moved to the two sides, when the first clamping seats 1006 move to the two sides, the first insertion holes 1008 and the first insertion rods 1009 are separated, and then the lower die seat 1007 is replaced, when the second clamping seats 1010 move to the two sides, the second insertion holes 1012 and the second insertion rods 1013 are separated, and then the upper die seat 1011 is replaced.

[0038] It should be noted that the specific model and specifications of the hydraulic cylinder 1004, the motor 2006, the electric turntable 3002, the telescopic rod 3003 and the vacuum pump 3007 need to be selected and determined according to the actual specifications of the device, and the specific selection calculation method adopts the existing technology in the art, so it will not be described in detail.

[0039] The power supply and principle of the hydraulic cylinder 1004, the motor 2006, the electric turntable 3002, the telescopic rod 3003 and the vacuum pump 3007 are clear to those skilled in the art, and will not be described in detail here.

[0040] The above only describes preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can be changed and modified in various ways. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An environmentally friendly automobile hardware production mold, characterized by, Including main body (100), drive mechanism (200) and material taking mechanism (300), the main body (100) includes lower punch seat (1001), the upper end of lower punch seat (1001) is installed with a pair of slide bar (1002), a pair of the upper end of slide bar (1002) is connected with top plate (1003), and a pair of slide bar (1002) is slidably sleeved with upper punch seat (1005), the upper end of top plate (1003) is connected with hydraulic cylinder (1004), the output end of hydraulic cylinder (1004) penetrates top plate (1003) and is connected with the upper end of upper punch seat (1005), the upper end surface both sides of lower punch seat (1001) are slidably connected with first clamping seat (1006), a pair of first clamping seat (1006) is equipped with lower die seat (1007), the bottom end surface both sides of upper punch seat (1005) are slidably connected with second clamping seat (1010), a pair of second clamping seat (1010) is equipped with upper die seat (1011), the drive mechanism (200) includes a pair of cross plate (2001), a pair of cross plate (2001) is arranged in the inside of lower punch seat (1001) and upper punch seat (1005) respectively.

2. The environmentally friendly automobile hardware production mold according to claim 1, characterized in that, The inside center of a pair of cross plate (2001) is embedded with bearing, the inside of a pair of bearings is connected with shaft (2002), the outside of one end of a pair of shaft (2002) is sleeved with gear (2003), the outside both sides of a pair of gear (2003) are engagedly connected with rack (2005).

3. The environmentally friendly automobile hardware production mold according to claim 2, characterized in that, The bottom end of a pair of first clamping seat (1006) is connected with the upper end of one side of a pair of rack (2005), the upper end of a pair of second clamping seat (1010) is connected with the bottom end of one side of another pair of rack (2005), the upper end and bottom end of a pair of cross plate (2001) are connected with a pair of slide bar (2004), the inside of two pairs of rack (2005) is slidably connected with slide bar (2004), the outer wall one side of slide bar (2004) is connected with the outer wall one side of cross plate (2001).

4. The environmentally friendly automobile hardware production mold according to claim 3, characterized in that, The upper end and bottom end of a pair of cross plate (2001) are connected with motor (2006), the output end of motor (2006) is drivingly connected between shaft (2002) through shaft coupling.

5. The environmentally friendly automobile hardware production mold according to claim 1, characterized in that, The outside both sides of lower die seat (1007) are equipped with a pair of first insertion hole (1008), the inside of a pair of first insertion hole (1008) is equipped with first insertion rod (1009), the one end of a pair of first insertion rod (1009) of the same side is connected with the outer wall one side of first clamping seat (1006).

6. The environmentally friendly automobile hardware production mold according to claim 5, characterized in that, The outside both sides of upper die seat (1011) are equipped with a pair of second insertion hole (1012), the inside of a pair of second insertion hole (1012) is equipped with second insertion rod (1013), the one end of a pair of second insertion rod (1013) of the same side is connected with the outer wall one side of second clamping seat (1010).

7. The environmentally friendly automobile hardware production mold according to claim 1, characterized in that, Said taking mechanism (300) includes U type board (3001), U type board (3001) is arranged at the back of lower punch holder (1001), and the inside of U type board (3001) is embedded with plane bearing, and the inside of plane bearing is connected with U electric turntable (3002), the upper end of U electric turntable (3002) is connected with telescopic link (3003), and the output end of telescopic link (3003) is connected with mounting plate (3004).

8. The environmentally friendly automobile hardware production mold according to claim 7, characterized in that, The bottom end of mounting plate (3004) is connected with communication pipe (3005), the bottom end of communication pipe (3005) is connected with vacuum chuck (3006), the upper end of mounting plate (3004) is connected with vacuum pump (3007), the input end of vacuum pump (3007) penetrates mounting plate (3004) and is connected with one end of communication pipe (3005).

Citation Information

Patent Citations

  • Environment -friendly automobile hardware production mould

    CN207431069U