A mold for producing a latex product and a method for manufacturing a ball head of the mold

Abstract

The present application relates to the technical field of mold for latex product production, and particularly relates to a mold for latex product production and a manufacturing method of a ball head of the mold, which comprises the following steps: material preparation; preparing a stainless steel plate of a corresponding specification; drawing: drawing the stainless steel plate to form a blank, wherein the blank is in a cylindrical shape with a closed front end, and the front end is a spherical end; rotary cutting: rotary cutting the edge of the rear end of the drawn blank to form a neat edge; heat shrinkage: clamping the blank, heating the rear end of the cylindrical blank, and performing several shrinkage operations to form a semi-finished ball head; and shaping: shaping the blank to form a smooth ball head. Through the improvement of the process, the ball head can be integrally formed, so that the problem of the sand eye or the missed welding of the ball head caused by the welding and affecting the quality of the final production of the balloon can be solved.

Description

Technical Field

[0001] This invention relates to the field of mold technology for latex product manufacturing, and specifically to a mold for latex product manufacturing and a method for manufacturing the ball head of the mold. Background Technology

[0002] Latex products mainly include latex balloons, condoms, etc., which are widely used in people's daily lives.

[0003] For example, in the production process of latex products such as balloons, the mold needs to be immersed in molten latex, then baked into a film, and then demolded to complete the production of balloon products.

[0004] Currently, the molds used in balloon production are mainly made of sintered ceramic materials or formed by metal welding. Due to the many disadvantages of ceramic molds, existing molds are generally made of metal, and the ball head of the mold is formed by welding two halves together.

[0005] However, molds produced using the semi-solid welding method are prone to defects such as incomplete welds or pinholes at the weld joints due to the influence of the welding process. Balloons produced using such molds will have gaps that are not visible to the naked eye. Once the balloon is inflated, it will expand and extend many times over, making it easy for it to explode or leak air through the gaps, affecting the normal use of the balloon and reducing the pass rate of the produced balloons. Summary of the Invention

[0006] The purpose of this invention is to provide a mold for producing latex products and a method for manufacturing the ball head of the mold. Through process improvement, the ball head can be produced in one piece, which solves the problem that welding causes pinholes or incomplete welding in the ball head, affecting the quality of the final balloon.

[0007] The objective of this invention is achieved as follows:

[0008] A method for manufacturing the ball head of a mold for producing latex products includes the following steps:

[0009] Material preparation; prepare stainless steel sheets of the appropriate specifications;

[0010] Drawing: The stainless steel sheet is drawn to form a blank, the blank being a cylindrical shape with a closed front end, the front end being a spherical end;

[0011] Rotary cutting; rotary cutting is performed on the rear edge of the drawn blank to form a neat edge;

[0012] Heat shrinking: After clamping the blank, the cylindrical rear end of the blank is heated and several shrinking operations are performed to form the ball head of the semi-finished product.

[0013] Shaping; shaping a blank part to form a smooth spherical head.

[0014] Preferably, during the heat shrinking process, the spherical end and middle part of the front end of the blank are clamped and fixed, and then the rear end of the blank is shrunk, so that the blank forms a semi-finished ball head with a spherical end at the front end, a cylindrical section in the middle, and an arc-shaped shrunk section at the rear end, and a handle extension section is formed at the rear end of the arc-shaped shrunk section; the ball head of the semi-finished product is hollow inside.

[0015] Preferably, during the heat shrinking process, the blank is first placed into the positioning groove of the shrinking mold, then the pressing mold of the shrinking mold extends into the blank and presses against the center of the bottom of the blank, and the blank is clamped and fixed in the positioning groove in conjunction with the positioning groove, and then the shrinking mechanism is used to realize the shrinking operation.

[0016] Preferably, the outer diameter of the pressing mold is less than or equal to the inner diameter of the constricted end of the smooth spherical head;

[0017] The bottom of the positioning groove is a hemisphere that fits the outer wall of the spherical end of the blank, and the side wall from the edge of the hemisphere to the opening of the positioning groove is a cylindrical section.

[0018] The pressing mold (6) is cylindrical with a rounded end at the front end, which is adapted to the inner wall of the spherical end of the blank.

[0019] When the blank is placed in the positioning groove and the arc end of the pressing mold (6) abuts against the inner wall of the spherical end of the blank, the axis of the pressing mold is collinear with the axis of the cylindrical section of the blank.

[0020] Preferably, during the shaping process, the ball head of the semi-finished product is placed into the lower mold of the shaping mold, and then the upper and lower molds approach each other and their end faces abut against each other to achieve arc-shaped shaping of the middle part of the ball head of the semi-finished product.

[0021] Preferably, an insertion hole is provided in the middle of the mold groove of the lower mold, and an inner support rod is provided in the insertion hole;

[0022] When the ball head of the semi-finished product is placed into the mold groove of the lower mold, and the end of the constricted end is placed in the insertion hole, the inner support rod is inserted into the constricted end to internally support and constrain the position of the ball head of the semi-finished product in the lower mold.

[0023] Preferably, during the heat shrinking process, the heating temperature is between 800 and 1400 degrees Celsius, and the shrinkage ratio is greater than 35%.

[0024] A mold for producing latex products, comprising:

[0025] The ball head produced above is made of stainless steel in one piece.

[0026] The connecting tube is made of stainless steel and welded to the shank extension of the ball head, with a smooth connection between the connecting tube and the shank extension.

[0027] The rear end of the connecting pipe has an outward-facing flange for fixing.

[0028] Preferably, the wall thickness of the ball head is 0.3 to 1.2 mm.

[0029] The outstanding and beneficial technical effects of this invention compared to the prior art are:

[0030] The method of this invention can produce the balloon head in one piece, avoiding issues such as missing welds and pinholes on the balloon head as seen in existing technologies. This method can prevent gaps in the produced balloon, thus preventing it from exploding or leaking when inflated. This improves production quality and efficiency, increases the pass rate, and saves energy. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the manufacturing method of the present invention.

[0032] Figure 2 This is a schematic diagram of the blank structure of the present invention.

[0033] Figure 3 This is a schematic diagram of the necking mold structure of the present invention.

[0034] Figure 4 This is a schematic diagram of the blank structure of the present invention.

[0035] Figure 5 This is a schematic diagram of the shaping mold of the present invention.

[0036] Figure 6 This is a schematic diagram of the mold structure for producing latex products according to the present invention.

[0037] Reference numerals: 1. Spherical head; 2. Connecting pipe; 3. Flanged edge; 4. Blank; 5. Positioning mold; 6. Pressing mold; 7. Positioning groove; 8. Cylindrical section; 9. Upper mold; 10. Lower mold; 11. Mold groove; 12. Insertion hole; 13. Inner support rod; 14. Spherical end; 15. Cylindrical shape; 16. Cylindrical section; 17. Arc-shaped constricted section; 18. Handle extension section. Detailed Implementation

[0038] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0039] like Figure 6 As shown, a mold for producing latex products includes:

[0040] The head of the ball is made of stainless steel and is spherical or elliptical in shape.

[0041] The connecting pipe 2 is made of stainless steel and has a flange 3 at the rear end. The front end is welded to the constricted end at the rear side of the ball head 1. The weld is ground to make the surface smooth.

[0042] The ball head 1 is made of stainless steel in one piece, with a sandblasted layer on the outer surface. The sandblasted layer mainly uses the sandblasting process to make the outer wall of the ball head 1 rough, thereby increasing the adhesion and making the balloon easier to form.

[0043] The wall thickness of the ball head 1 is 0.3 to 1.2 mm, and the wall thickness of the connecting tube 2 is the same as that of the ball head 1.

[0044] This ensures the balloons are evenly distributed and allows for convenient and rapid heating and cooling. Thus, energy conservation is achieved during balloon production.

[0045] Meanwhile, corrosion-resistant treatments can be applied to the outer walls of the ball head 1 and the connecting pipe 2, such as electroplating, powder coating, and Teflon surface treatment, to solve problems related to product oxidation, corrosion, and acid and alkali resistance, thereby extending the service life.

[0046] Materials can also be made of metals such as titanium alloys and low-carbon steel.

[0047]

Example 1

[0048] like Figure 1 As shown, in order to produce the above-mentioned mold, a new manufacturing method is designed, which mainly includes the following steps:

[0049] Before starting, prepare steel pipes of the required dimensions and stainless steel plates of the corresponding specifications. In this technical solution, seamless stainless steel pipes and stainless steel plates are used as examples.

[0050] Material preparation: Based on the dimensions of the products to be produced, first cut the seamless stainless steel pipes to the appropriate length and the stainless steel sheets to the appropriate size.

[0051] Drawing; the stainless steel sheet is drawn and formed several times to form a blank 4, the blank 4 being a cylindrical shape 15 with a closed front end, the front end being a spherical end 14.

[0052] like Figure 2 As shown, the sheet can be drawn multiple times using the drawing process. The front end is a spherical end 14, and the other parts are cylindrical blanks 4. The size of the spherical end 14 of the blank 4 is the same as the size of the ball head 1 of the mold, and the size of the cylindrical part 15 is the same as or approximately the same as the maximum diameter part in the middle of the ball head 1 of the mold.

[0053] The drawing method used here can greatly improve the production efficiency of blank part 4. Cold forming can be used, which can save the heating process, achieve the purpose of energy saving and emission reduction, and at the same time ensure that the wall thickness of the produced blank part 4 is more uniform. It is also more convenient to cut the edge at the rear end.

[0054] The drawing and forming process of stainless steel sheet is basically the same as that of conventional thermos cup liner forming process. Both involve forming a cylindrical blank of 15 after the stainless steel sheet goes through multiple processes. The multiple processes involved are existing technologies and will not be elaborated in detail. Please refer to the relevant records in 2021102814771 and 2021102814771.

[0055] Rotary cutting; the rear edge of the drawn blank 4 is rotary cut to form a neat edge;

[0056] Using rotary cutting to trim the edge can preserve the shape of the blank 4 as much as possible, reduce the amount of deformation caused by the rotary cutting process, and ensure the accuracy of subsequent processing.

[0057] Heat shrinking; This process mainly involves shrinking the rear end of the cylindrical shape 15 of the rotary-cut blank 4, so that the reduced diameter of the rear end conforms to the size of the rear end of the ball head 1 of the mold.

[0058] The main action is to clamp the blank 4, heat the rear end of the cylindrical shape 15 of the blank 4, and perform several necking operations to form the semi-finished ball head 1. In this embodiment, at least 4 operations are used, but it is not ruled out that other operations can also achieve the necking process.

[0059] Because the shrinkage at the rear end is very large during the process from the blank part 4 to the finished ball head 1, the shrinkage ratio is greater than 35% (for example, if a 50mm pipe is formed, then the shrinking end needs to be reduced to 16mm). Due to the extreme degree of shrinkage, cracking is likely to occur if shrinkage is carried out in one step. Cold shrinkage is even more likely to cause cracking. Therefore, heating and multiple shrinking methods are used to achieve the desired shape and size of the rear end of the cylindrical shape 15 of the blank part 4.

[0060] The necking can be done using spinning equipment, sealing equipment, or stamping equipment. During necking, heating can be performed first, and the heating temperature is between 800 and 1400 degrees Celsius. Heating is more conducive to the flow of part material, reduces the number of forming steps, results in a more perfect shape, and increases production efficiency. This embodiment takes spinning equipment as an example.

[0061] Since the front end of the blank 4 is a spherical end 14, it is easy to slip during the shrinking process after being placed in the shrinking mold, which leads to inaccurate shrinking position. Therefore, in order to solve this problem, a new shrinking mold was specially designed, and its main structure is as follows.

[0062] Combination Figure 3 The necking mold includes a positioning mold 5 and a pressing mold 6. The end face of the positioning mold 5 is recessed inward to form a positioning groove 7. The bottom of the positioning groove 7 is also designed as a hemispherical shape, which is adapted to the shape of the spherical end 14 at the front end of the blank 4. The positioning groove 7 also includes a cylindrical section 8. The cylindrical section 8 extends from the edge of the hemispherical shape to the side wall at the opening of the positioning groove (7). The pressing mold 6 is cylindrical in whole, and the front end is an arc end, which is adapted to the inner wall of the spherical end 14 of the blank (4).

[0063] When the blank 4 is placed in the positioning groove 7, except that the spherical end 14 at the front end of the blank 4 is placed at the bottom of the positioning groove 7, the cylindrical part 15 of the blank 4 will be placed in the cylindrical section 8 and closely attached to its inner wall. The cylindrical part 15 abuts against the cylindrical section 8 to constrain the sliding of the blank 4 in the positioning groove 7.

[0064] When the blank 4 is placed in the positioning groove 7, the front end of the pressing mold 6 will be inserted into the blank 4 under the drive of the hydraulic cylinder or the air cylinder, and press against the center position of the spherical end 14 of the blank 4. The shape of the front end of the pressing mold 6 is adapted to the shape of the bottom of the positioning groove 7. The blank 4 is clamped and fixed in the positioning groove 7 through the cooperation of the positioning mold 5 and the pressing mold 6. At this time, when the arc end of the pressing mold (6) abuts against the inner wall of the spherical end 14 of the blank (4), the axis of the pressing mold (6) is collinear with the axis of the cylindrical section 16 of the blank (4).

[0065] Since the positioning mold 5 and the pressing mold 6 can be driven to rotate at high speed, after being clamped and fixed, they can drive the blank (4) to rotate at high speed. The principle is the same as the spindle principle of the machine tool, so it will not be elaborated.

[0066] During high-speed rotation, the external necking component approaches the rear end of the cylindrical shape 15 of the high-speed rotating and heated blank 4 to perform necking operation, so that the rear end of the blank 4 will be necked until the inner wall of the necking part abuts against the outer wall of the pressing mold 6 (or it can be necked until it does not abut against the outer wall), thus completing the necking operation. Afterwards, the external necking component returns to its position, and the pressing mold 6 retracts. Since the pressing mold 6 is cylindrical and smaller than the diameter after necking, it can smoothly detach from the necked blank 4, thus completing the necking process of the blank 4 and producing the semi-finished ball head 1.

[0067] One additional point is that the pressing mold 6 can be divided into a pressing section and an inner support section. The arc end is formed at the front end of the pressing section, and the inner support section is located at the rear. The outer diameter of the inner support section can be designed to be the same as the inner diameter of the constricted end of the ball head in the design drawing (so that during constriction, the inner support section can be used to support or limit the constriction of the constricted end to ensure the accuracy and shape of the constriction). The outer diameter of the pressing section can be equal to or less than the outer diameter of the inner support section. In this embodiment, it is taken as equal to the outer diameter for further explanation.

[0068] like Figure 4 As shown, the shape of the ball head of the semi-finished product processed by the heat shrinking process is that the front end is a spherical end 14, the middle part is a cylindrical section 16, and the rear part is an arc-shaped shrinking section 17. A handle extension section 18 is formed at the rear end of the arc-shaped shrinking section 17, and the inside of the ball head of the semi-finished product is hollow.

[0069] In the design, the outer diameter of the inner support section of the compression mold can also be smaller than the inner diameter of the constricted end of the ball head 1.

[0070] Shaping; During the shrinking process, in order to avoid slippage, a central cylindrical shape is designed in the ball head 1 of the semi-finished product. However, the actual ball head 1 should be spherical or elliptical (similar to an egg shape). Therefore, the central cylindrical shape needs to be removed. The main task in this shaping process is to eliminate the central cylindrical design. The specific solution is as follows.

[0071] The shaping process takes place in a shaping mold, such as... Figure 5 As shown, the forming mold mainly includes an upper mold 9 and a lower mold 10. Both the upper mold 9 and the lower mold 10 have mold grooves 11. At the same time, an insertion hole 12 is provided at the bottom of the mold groove 11 of the lower mold 10. The shrunken end of the ball head 1 of the semi-finished product after heat shrinking is inserted into the insertion hole 12. The arc-shaped area of ​​the shrunken end fits into the mold groove 11 of the lower mold 10. In order to avoid excessive deformation of the shrunken end during the forming process, an inner support rod 13 is provided in the lower mold 10. The inner support rod 13 is inserted into the shrunken end and cooperates with the insertion hole 12. The inner wall of the manhole 12 constrains the spherical head 1 of the semi-finished product. Then, the upper mold 9 and the lower mold 10 move closer to each other. As they move, the mold groove 11 of the upper mold 9 presses against the front end of the spherical head 1 of the semi-finished product. Then, through the mutual extrusion of the lower mold 10 and the upper mold 9, and under the constraint of the mold groove 11 of the upper mold 9 and the mold groove 11 of the lower mold 10, the cylindrical segment 8 in the middle of the spherical head 1 of the semi-finished product can only deform and expand outward until it completely fits into the mold cavity formed by the mold groove 11 of the upper mold 9 and the mold groove 11 of the lower mold 10. In this way, the cylindrical segment 8 can be made into an arc shape, so that the cylindrical segment 8 of the spherical head 1 of the semi-finished product disappears, and the whole becomes spherical, which meets the design requirements of the spherical head 1, thus completing the one-piece molding of the spherical head 1.

[0072] The stroke of the moving extrusion can be adjusted through a limited number of experiments so that when the upper and lower dies are brought together, the cylindrical outer wall of the middle part of the ball head 1 of the internal semi-finished product is formed onto the inner wall of the upper and lower dies, thereby completing the shaping process.

[0073] However, since the mold for producing complete latex products also requires connecting pipe 2 and other processes, the next step is to weld connecting pipe 2 to the edge of the constricted end of the produced ball head 1. After that, the mold after welding can be ground, polished or coated with a coating or other surface treatments to become the final product.

[0074] Since the molds used in the production of products such as balloons are generally located at the extension section 18 of the handle, and the latex extending to the connecting tube 2 is also used for edge rolling, the sealing requirements are low. Therefore, the weld at this location will not affect the production of latex products.

[0075] Different materials require different surface treatments. For example, stainless steel and titanium alloy parts are polished and sandblasted, while low carbon steel can be treated with electroplating, powder coating, or Teflon to solve problems such as oxidation, corrosion, and acid and alkali resistance.

[0076] The biggest challenge in the welding process is avoiding post-weld depressions and pinholes. These defects, even after surface treatment, can be fatal to latex products in actual production. To address these defects, welding parameters such as power, energy, and frequency are optimized. Inert gas is used for welding protection, and strict control is exercised over the penetration depth, weld width, and weld pool shape.

[0077] The rear end of the connecting pipe 2 needs to have a folded edge for subsequent use with other equipment. In this invention, the folded edge is designed by first expanding the rear end of the connecting pipe 2 with a pipe expander to form a flared mouth, and then using a stamping device or other equipment to form the flared mouth to form a flange 3 perpendicular to the outer wall of the connecting pipe 2.

[0078] The pre-expansion molding design may prevent cracking and ensure the quality of the connecting pipe 2. At the same time, the design of this invention has significant energy-saving effects, as shown in the following energy-saving data table.

[0079] 1 Speed 60-120 0.32 Producing 190 more boxes per day 2 Furnace box temperature 200-220° 0.18 3 oil return temperature 230-240° 0.11 4 natural gas 4 grams 380,000 yuan / year Energy saving of 6 yuan per box 5 Adhesive 7.0 65,000 yuan / year Metal molds heat up quickly and evaporate little. 6 Weight of milk powder products 0.08-0.18 grams 0.05-0.125 grams 7 mold weight 100-120 grams 50-100 grams

[0080] Comparison of thermal conductivity data

[0081] 220° 6 points [175°] 2.5 points [175°] 58.3％ 210° 9.2 points [175°] 4.1 points [175°] 55.5％ 200° 10.3 points [175°] 5.2 points [175°] 50.6％ 190° 15.5 points [175°] 7.2 points [175°] 49.4％ 180° 19.2 points [175°] 10.5 points [175°] 45.2％

[0082]

Example 2

[0083] In this embodiment, seamless steel pipes can be used instead of sheet metal. The front end is heated at high frequency to 700-1300 degrees using a heat sealing device. The heated front end is then extruded to achieve heat sealing. Afterward, the sealed pipe is formed by end extrusion through a pressing process to make the wall thickness of the sealed end consistent with that of the overall pipe.

[0084] Using heat sealing equipment for end heat sealing can minimize the number of heating points, thereby reducing energy consumption. At the same time, it has high heating efficiency and high sealing efficiency, thus improving the overall production efficiency.

[0085] As shown in the figure, the thickness in the middle of the end of the heat-sealed pipe is thicker than other areas; the wall thickness at the front end does not meet the requirements.

[0086] Therefore, the pressing process is adopted in this step, that is, the part to be heat-sealed is placed into the bottom mold, and then the mandrel is inserted into the pipe and pressed against the inner wall of the end of the heat-sealed part. With continuous force, in conjunction with the bottom mold 5, the material of the thicker part in the middle of the heat-sealed part can be squeezed outward to make the middle part thinner. At the same time, the wall thickness can be kept consistent and the pipe wall can be tightened during the pressing process, eliminating some defects generated during the production of pipe fittings.

[0087] After that, subsequent processes such as heat shrinking can be carried out.

[0088] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A method for manufacturing the ball head of a mold for producing latex products, characterized in that, Includes the following steps: Material preparation; Prepare stainless steel sheets of the appropriate specifications; Drawing: The stainless steel sheet is drawn to form a blank (4), the blank (4) being a cylindrical shape (15) with a closed front end, the front end being a spherical end (14); Rotary cutting; the rear edge of the drawn blank (4) is rotary cut to form a neat edge; Heat shrinking; after clamping the blank (4), the rear end of the cylindrical shape (15) of the blank (4) is heated and several shrinking operations are performed to form a semi-finished ball head (1); during the heat shrinking process, the spherical end (14) at the front end and the middle part of the blank (4) are clamped and fixed, and then the rear end of the blank (4) is shrunk, so that the blank (4) forms a semi-finished ball head (1) with a spherical end (14) at the front end, a cylindrical section (16) in the middle, and an arc-shaped shrinking section (17) at the rear end of the arc-shaped shrinking section (17), and a handle extension section (18) is formed at the rear end of the arc-shaped shrinking section (17); the interior of the semi-finished ball head (1) is hollow. Shaping; Shaping the blank (4) to form a smooth ball head (1); During the shaping process, the ball head (1) of the semi-finished product is placed into the lower mold (10) of the shaping mold, and then the upper mold (9) and the lower mold (10) approach each other and abut their end faces to achieve arc-shaped forming of the middle part of the ball head (1) of the semi-finished product.

2. The method for manufacturing the ball head of the mold for producing latex products according to claim 1, characterized in that: During the heat shrinking process, the blank (4) is first placed into the positioning groove (7) of the shrinking mold. Then, the pressing mold of the shrinking mold extends into the blank (4) and presses against the center of the bottom of the blank (4). The blank (4) is clamped and fixed in the positioning groove (7) in conjunction with the shrinking mechanism to achieve the shrinking operation.

3. The method for manufacturing the ball head of a mold for producing latex products according to claim 2, characterized in that: The outer diameter of the pressing mold is less than or equal to the inner diameter of the constricted end of the smooth ball head (1); The bottom of the positioning groove (7) is a hemisphere that matches the outer wall of the spherical end (14) of the blank (4), and the side wall from the edge of the hemisphere to the opening of the positioning groove (7) is a cylindrical section. The pressing mold (6) is cylindrical with a rounded end at the front end, which is adapted to the inner wall of the spherical end (14) of the blank (4). When the blank (4) is placed in the positioning groove (7) and the arc end of the pressing mold (6) abuts against the inner wall of the spherical end (14) of the blank (4), the axis of the pressing mold (6) is collinear with the axis of the cylindrical section (16) of the blank (4).

4. The method for manufacturing the ball head of a mold for producing latex products according to claim 1, characterized in that: The lower mold (10) has an insertion hole (12) in the middle of the mold groove (11), and an inner support rod (13) is provided in the insertion hole (12); When the ball head (1) of the semi-finished product is placed in the mold groove (11) of the lower mold (10), and the end of the constricted end is placed in the insertion hole (12), and the inner support rod (13) is inserted into the constricted end to internally support and constrain the position of the ball head (1) of the semi-finished product in the lower mold (10).

5. The method for manufacturing the ball head of a mold for producing latex products according to claim 1, characterized in that: During the heat shrinking process, the heating temperature is between 800 and 1400 degrees Celsius; the shrinkage ratio is greater than 35%.

6. A mold for producing latex products, characterized in that, include: The ball head (1) produced according to any one of claims 1-5 is made of stainless steel in one piece; The connecting tube (2) is made of stainless steel and welded to the handle extension (18) of the ball head (1), and the connecting tube (2) and the handle extension (18) are smoothly connected. The rear end of the connecting pipe (2) has a flange (3) for fixing.

7. The mold for producing latex products according to claim 6, characterized in that: The wall thickness of the ball head (1) is 0.3 to 1.2 mm.

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