A method and apparatus for the production of low temperature polyurethane foamed shapes in cement pots

Abstract

The application discloses a low-temperature polyurethane foaming forming application method and production equipment in a cement kettle bell, belongs to the kettle bell processing technical field, and comprises a tire body pouring mold and a rubber coating mold, the tire body pouring mold comprises an upper mold one and a lower mold one, the opposite surfaces of the upper mold one and the lower mold one are both provided with a forming groove one, the lower mold one is provided with a positioning groove for positioning a metal handle, the rubber coating mold comprises an upper mold two and a lower mold two, the upper mold two and the lower mold two are provided with clamping grooves, the cement tire body is first formed by the tire body pouring mold, the metal handle and the cement tire body are formed as a whole in the pouring process, the metal handle does not need to be installed in the later period, the cement and the metal handle are increased in association degree, a plastic layer is wrapped outside the solidified cement tire body, the appearance of the kettle bell can be beautified, the plastic layer has certain elasticity and buffering performance, the service life of the kettle bell can be prolonged, and the impact and damage to the ground can be avoided.

Description

Technical Field

[0001] This invention relates to a method and production equipment for low-temperature polyurethane foam molding in cement kettlebells, belonging to the field of kettlebell processing technology. Background Technology

[0002] Weightlifting is a beneficial exercise for both the body and mind, developing skeletal muscle strength and size. Kettlebell exercises allow for various pushing, lifting, raising, throwing, and squat jumps. Unlike dumbbell and barbell exercises, kettlebell training is more effective at comprehensively improving overall explosive power.

[0003] Currently available on the market are blow-molded cement kettlebells, cast iron kettlebells with rubber coating, and metal-cased kettlebells with rubber coating. The disadvantages of blow-molded cement kettlebells are: the blow-molded shell is thin, lacks elasticity, has poor impact resistance, and provides poor protection for the kettlebell; The disadvantages of rubber-coated kettlebells with cast iron bodies and metal shells are: rubber coating generally requires high-temperature vulcanization at 125°C, and the constant temperature molding time is 15 to 30 minutes, resulting in low production efficiency. Furthermore, high-temperature coating is prone to producing bubbles, and harmful substances are released during the vulcanization process of rubber coating. In addition, rubber coating must be done with a metal body, which increases the cost.

[0004] The blow-molded cement kettlebell structure includes a plastic layer and a counterweight filled within the plastic layer. An opening is provided at the bottom of the plastic layer, and a cap is provided at the opening to seal it.

[0005] The processing procedure is as follows: First, fluid cement is filled into the cavity of the blown plastic layer through the opening and filled completely. Before the cement solidifies, the pillar or cylinder wall of the cap is inserted into the cement. After standing for a period of time, the cement, yellow sand and cap solidify into one. This injection method has the following disadvantages: (1) The opening at the bottom of the plastic layer is small, so it is best to use a funnel or the like for injection. Otherwise, the mixture will be difficult to clean after it solidifies on the surface of the plastic layer, which is not convenient for operation; (2) The cement body and the plastic layer have a low degree of association after solidification. After long-term use, the body and the inner wall of the plastic layer are easy to separate and create gaps.

[0006] Therefore, a method and production equipment for low-temperature polyurethane foam molding in cement kettlebells are proposed. Summary of the Invention

[0007] To address the problems existing in the prior art, the present invention provides a method and production equipment for low-temperature polyurethane foam molding in cement kettlebells, which can first cast the cement body of the kettlebell and then perform polyurethane foaming or PVC dripping for encapsulation.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: a production equipment for low-temperature polyurethane foam molding in cement kettlebell applications, comprising a casting mold for the body and a coating mold. The casting mold for the cement body includes an upper mold and a lower mold. The upper mold and the lower mold are provided with forming grooves on their opposite sides. The lower mold is provided with a positioning groove on one side of the forming groove for positioning a metal handle. The metal handle is made of metal. The upper mold is provided with a pressing surface corresponding to the positioning groove. When the upper mold and the lower mold are opened and closed, the metal handle is placed on the positioning groove. When the upper mold and the lower mold are closed, the two forming grooves are joined together to form a casting cavity for casting the cement body. The top of the upper mold is provided with a pouring hole for injecting fluid cement into the casting cavity. The metal handle is pressed into the positioning groove by the pressing surface and both ends of the metal handle extend into the casting cavity. The overmolding mold includes an upper mold and a lower mold. Both the upper mold and the lower mold have forming grooves on their opposite sides. The upper mold and the lower mold also have clamping grooves on one side of the forming grooves to clamp the metal handle. When the upper mold and the lower mold are closed, the two forming grooves are joined together to form an overmolding cavity. The metal handle is clamped inside the clamping groove, and an overmolding void is formed between the cement body and the overmolding cavity. The shape of the clamping groove matches the shape of the metal handle. After the metal handle is clamped by the clamping groove, the metal handle plays a limiting role in the cement body.

[0009] Preferably, a positioning post is fixedly connected to the bottom of the forming groove one. When the cement body gradually forms in the pouring cavity, its outer wall will naturally form a groove at the position of the positioning post one. The groove lays the foundation for the accurate positioning of the cement body. A positioning post two is fixedly connected to the bottom of the lower mold two. When the cement body is placed in the rubber coating cavity, the positioning post two is inserted into the groove on the outer wall of the cement body.

[0010] Preferably, overflow grooves for guiding overflowing cement are provided on the opposite surfaces of the upper mold and the lower mold, and the overflow grooves are distributed along the contour of these molding grooves.

[0011] Preferably, multiple protrusions are provided on the side wall of the forming groove one. When the cement body is formed in the casting cavity, the outer wall of the cement body forms an associative groove at the position of the protrusion.

[0012] The protrusion includes a liner and an airbag. The liner is fixedly installed on the inner wall of the casting cavity, and the airbag is fixedly installed on the liner. The inner cavity of the airbag is connected to an external air pump through an air passage. The overmolding mold is equipped with a second liner and a second airbag. The second liner is fixedly installed on the inner wall of the overmolding cavity, and the second airbag is fixedly installed on the second liner. The inner cavity of the second airbag is connected to an external air pump through an air passage.

[0013] A method for applying low-temperature polyurethane foam molding to cement kettlebells includes the following steps: Step 1: Laser processing of metal handles, bending the metal handles into tubes and performing surface treatment; Step 2: Place the metal handle in the positioning groove, close the upper mold and the lower mold, pour fluid cement into the pouring cavity, the cement solidifies and forms a cement body, and the metal handle is embedded in the cement body. Step 3: Place the cement body into the rubber-coating cavity, close the upper mold 2 and the lower mold 2, and use the clamping groove to clamp the metal handle to fix the position of the cement body, forming a rubber-coating void. Step 4: Inject fluid plastic into the plastic wrapping layer to wrap the cement body. Plastic wrapping can reduce the direct collision between the cement body and other objects or the ground, thereby reducing the risk of wear and damage to the cement body. Step 5: After the fluid plastic fills the encapsulation void and is low-temperature molded, a plastic layer is formed that encapsulates the cement body, completing the kettlebell molding. Encapsulating the outer wall of the cement body with a plastic layer allows the plastic layer to be firmly wrapped around the outer wall of the cement body, thereby improving the adhesion between the cement body and the plastic layer.

[0014] Preferably, in steps one and two, the end of the metal handle is uniformly provided with multiple elongated holes and / or multiple thorns.

[0015] Preferably, in step four, the plastic layer is made of polyurethane foam or PVC epoxy resin.

[0016] Preferably, in step five, the temperature of the polyurethane foam overmolding mold is no higher than 100°C, and the low-temperature molding time is no more than five minutes.

[0017] Preferably, in step five, the low temperature of the polyurethane foam overmolding mold is 60°C, and the low temperature molding time is three minutes.

[0018] Compared with existing technologies: 1. This invention utilizes a casting mold to first cast the cement body into shape. During the casting process, the metal handle is cast into a single unit with the cement body. This eliminates the need for later installation of the metal handle, increases the bonding strength between the cement and the metal handle, and improves the stability of use. Furthermore, a plastic layer is wrapped around the solidified cement body, which enhances the appearance of the kettlebell. The plastic layer also has a certain degree of elasticity and cushioning properties, which can extend the service life of the kettlebell, prevent impact and damage to the ground, and prevent the cement body from contaminating the outer wall of the plastic layer, thus saving on cleaning operations.

[0019] 2. In this invention, fluid cement flows from the elongated hole or the end of the metal handle into the interior of the metal handle. The infiltrated portion firmly fixes the metal handle inside the cement body, thereby greatly enhancing the stability between the metal handle and the cement body. This not only improves the durability of the kettlebell but also ensures the safety of the user during use.

[0020] 3. By setting protrusions on the side wall of the molding groove, when the cement body is formed in the casting cavity, the outer wall of the cement body forms an associative groove at the position of the protrusion. The plastic layer cooperates with the associative groove, increasing the degree of association between the cement body and the plastic layer. Even after long-term use, there will be no problem of separation and gaps between the body and the inner wall of the plastic layer.

[0021] 4. This invention forms a plastic layer that encapsulates the cement body by molding at a low temperature of no more than 100°C for less than five minutes, thereby completing the kettlebell molding process. This improves production efficiency, and the low-temperature encapsulation can prevent the formation of air bubbles and improve the adhesion between the cement body and the plastic layer. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the casting mold for the tire body of the present invention.

[0023] Figure 2 This is a schematic diagram of the structure of the lower mold of the present invention.

[0024] Figure 3 This is a schematic diagram of the upper mold of the present invention.

[0025] Figure 4 This is a split view of the lower mold and the upper mold of the present invention.

[0026] Figure 5 This is a schematic diagram of the overmolding mold of the present invention.

[0027] Figure 6 This is a split view of the lower mold 2 and the upper mold 2 of the present invention.

[0028] Figure 7 This is a schematic diagram of the structure of the lower mold of the present invention.

[0029] Figure 8 This is a schematic diagram of the upper mold of the present invention.

[0030] Figure 9 This is a schematic diagram of the structure of the lower mold, cement body, protrusions, and associative grooves of the present invention. Figure 1 ; Figure 10 This is a schematic diagram of the structure of the kettlebell body of the present invention; Figure 11 This is a cross-sectional view of the kettlebell body of the present invention; Figure 12 This is a cross-sectional view of the upper mold, lower mold, and air passage of the present invention. Figure 13 For the present invention Figure 12 Enlarged view of point A; Figure 14 This is a cross-sectional view of the cement body and the bonding groove of the present invention; Figure 15 This is a cross-sectional view of the upper mold, the liner, the airbag, and the air passage of the present invention. Figure 16 This is a cross-sectional view of the upper mold 2, the lower mold 2, and the air passage 2 of the present invention; Figure 17 For the present invention Figure 13 Enlarged view of point B.

[0031] In the diagram: 1. Casting mold for the tire body; 101. Upper mold one; 102. Lower mold one; 103. Molding groove one; 104. Positioning groove; 105. Pressing surface; 106. Injection hole; 107. Locking component; 2. Rubber coating mold; 201. Upper mold two; 202. Lower mold two; 203. Molding groove two; 204. Clamping groove; 205. Injection hole; 3. Metal handle; 301. Long hole; 4. Cement tire body; 5. Positioning post one; 6. Positioning post two; 7. Overflow groove; 8. Protrusion; 801. Liner one; 802. Airbag one; 9. Associative groove; 10. Plastic layer; 11. Air passage one; 12. Liner two; 13. Airbag two; 14. Air passage two. Detailed Implementation

[0032] The present invention is illustrated below with specific embodiments, but these are not intended to limit the invention.

[0033] Example 1 like Figures 1-8 as well as Figure 10 , Figure 11 As shown in this embodiment, a low-temperature polyurethane foam molding production equipment for cement kettlebells is provided, including a body casting mold 1 and a rubber coating mold 2. The casting mold 1 for the tire body includes an upper mold 101 and a lower mold 102. Both the upper mold 101 and the lower mold 102 have forming grooves 103 on their opposite surfaces. The lower mold 102, located on one side of the forming groove 103, has a positioning groove 104 for positioning a metal handle 3. The metal handle 3 has high strength. The upper mold 101 has a pressing surface 105 corresponding to the positioning groove 104. Figure 4As shown, when the upper mold 101 and the lower mold 102 open and close, the metal handle 3 is placed on the positioning groove 104. When the upper mold 101 and the lower mold 102 close, the two forming grooves 103 are joined together to form a casting cavity for pouring the cement body 4. Cement is used as the main material to make the kettlebell body. Compared with other metal materials, cement has a lower cost, saving production costs. The material ratio of the cement body 4 can be: 45% sand, 28% cement, and 27% gravel. In addition, materials such as iron ore and lead blocks can be added to the cement body 4 to increase the density and weight of the cement body 4. Figure 1 As shown, the top of the upper mold 101 is provided with a pouring hole 106 for pouring fluid cement into the pouring cavity. The metal handle 3 is pressed into the positioning groove 104 by the pressing surface 105 and the two ends of the metal handle 3 extend into the pouring cavity. After the fluid cement is poured into the pouring cavity, the cement is formed inside the pouring cavity. The two ends of the metal handle 3 are wrapped by the cement in the forming cavity. After the cement solidifies, the cement is formed into a spherical cement body 4 and the two ends of the metal handle 3 are embedded in the cement body 4. In addition, a locking member 107 is provided at the connection between the upper mold 101 and the lower mold 102. After the upper mold 101 and the lower mold 102 are closed, the locking member 107 locks the upper mold 101 and the lower mold 102 in place. The overmolding mold 2 includes an upper mold 201 and a lower mold 202. Both the upper mold 201 and the lower mold 202 have forming grooves 203 on their opposite surfaces. A clamping groove 204 is provided on one side of each forming groove 203 on both the upper mold 201 and the lower mold 202 to clamp the metal handle 3. When the upper mold 201 and the lower mold 202 are closed, the two forming grooves 203 are joined to form an overmolding cavity. The metal handle 3 is clamped inside the clamping groove 204, and an overmolding void is formed between the cement body 4 and the overmolding cavity. The shape of the clamping groove 204 matches the shape of the metal handle 3. After the metal handle 3 is clamped by the clamping groove 204, the metal handle 3 limits the position of the cement body 4, causing the cement body 4 and the overmolding cavity to be concentric, resulting in the same thickness of the overmolding void at all positions. Figure 5 As shown, the top of the upper mold 201 has a through-hole 205 for injecting fluid plastic into the overmolded layer. The plastic layer 10 is in a fluid state before molding, and becomes solid after low-temperature molding.

[0034] like Figure 2 , Figure 7As shown, in order to effectively prevent the cement body 4 from shifting position in the coating cavity, a positioning post 5 is fixedly connected to the bottom of the lower mold 102. As the cement body 4 gradually forms in the casting cavity, a groove will naturally form on its outer wall at the position of the positioning post 5. The groove lays the foundation for the accurate positioning of the cement body 4. A positioning post 6 is fixedly connected to the bottom of the lower mold 202. When the formed cement body 4 is placed in the coating cavity, the positioning post 6 will accurately insert into the groove on the outer wall of the cement body 4. This use of the previously formed groove ensures that the cement body is accurately positioned in the coating cavity, effectively preventing the cement body 4 from shifting position in the coating cavity, greatly improving production efficiency and product quality. It is suitable for mass production. While ensuring product quality, it significantly reduces the scrap rate caused by positional deviation, thereby saving production costs.

[0035] like Figure 2 , Figure 3 As shown, in order to prevent the cement injected into the casting cavity from overflowing everywhere, overflow grooves 7 are provided on the opposite surfaces of the upper mold 101 and the lower mold 102 to guide the overflowing cement. The overflow grooves 7 are distributed along the contour of these forming grooves 103. If too much cement is injected into the casting cavity or the casting speed is too fast, the excess cement will overflow into the overflow grooves 7 and flow out along the overflow grooves 7, thereby preventing cement from overflowing everywhere and polluting the processing environment.

[0036] A method for applying low-temperature polyurethane foam molding to cement kettlebells includes the following steps: Step 1: Laser process the metal handle 3, bend the metal handle 3 into a tube shape and perform surface treatment, which can be chrome plating, stainless steel or other forms of surface treatment. Step 2: Place the metal handle 3 in the positioning groove 104, close the upper mold 101 and the lower mold 102, pour fluid cement into the pouring cavity, the cement solidifies and forms a cement body 4, and the metal handle 3 is embedded in the cement body 4. Step 3: Place the cement body 4 into the rubber-coating cavity, close the upper mold 201 and the lower mold 202, and use the clamping groove 204 to clamp the metal handle 3 to fix the position of the cement body 4, forming a rubber-coating void. Step 4: Inject fluid plastic into the encapsulation void to encapsulate the cement body 4. Encapsulation can reduce direct collisions between the cement body 4 and other objects or the ground, thereby reducing the risk of wear and damage to the cement body 4. In addition, encapsulation can provide a soft and non-slip surface, reducing the discomfort of users when in direct contact with the kettlebell cement body 4, making it more comfortable to use. Step 5: After the fluid plastic fills the encapsulation void and is formed at low temperature, a plastic layer 10 is formed that encapsulates the cement body 4, thus completing the kettlebell forming. Encapsulating the outer wall of the cement body 4 with the plastic layer 10 allows the plastic layer 10 to be tightly wrapped on the outer wall of the cement body 4, thereby improving the adhesion between the cement body 4 and the plastic layer 10.

[0037] In steps one and two, the end of the metal handle 3 is uniformly provided with multiple elongated holes 301 and / or multiple protrusions to increase the adhesion between the metal handle 3 and the cement body, making it more stable; There are three scenarios for setting the elongated hole 301 and the spinous process as described above: 1. Multiple elongated holes 301 are evenly provided at the end of the metal handle 3; 2. The end of the metal handle 3 is evenly provided with multiple thorns; 3. The end of the metal handle 3 is provided with multiple elongated holes 301 and multiple thorns.

[0038] In step four, the plastic layer 10 is made of polyurethane foam or PVC epoxy resin.

[0039] In step five, the temperature of the polyurethane foam overmolding mold is no higher than 100°C, and the low-temperature molding time is no more than five minutes.

[0040] In step five, the optimal low-temperature temperature for the polyurethane foam overmolding mold is 60°C, and the optimal low-temperature molding time is three minutes.

[0041] Example 2 like Figures 9-17 As shown in Example 1, in order to further improve the adhesion between the cement body 4 and the plastic layer 10, multiple protrusions 8 are provided on the side wall of the molding groove 103. The protrusions 8 can be raised hemispherical in shape. When the cement body 4 is formed in the casting cavity, the outer wall of the cement body 4 forms an adhesion groove 9 at the position of the protrusion 8. After the cement body 4 solidifies, the cement body 4 is coated with plastic. When the fluid plastic is injected into the coating cavity, the plastic enters the adhesion groove 9 on the cement body 4, increasing the adhesion between the cement body 4 and the plastic layer 10.

[0042] The protrusion 8 includes a liner 801 and an airbag 802. The liner 801 is fixedly installed on the inner wall of the casting cavity, and the airbag 802 is fixedly installed on the liner 801. The inner cavity of the airbag 802 is connected to an external air pump through an air passage 11. Figure 12As shown, air passages 11 are formed on the upper mold 101 and the lower mold 102. The number of air passages 11 matches the number of airbags 802. The end of the air passage 11 away from the airbag 802 is connected to an external air pump. When the external air pump is started, it injects gas into the inner cavity of the airbag 802 through the air passage 11. At this time, the airbag 802 inflates, causing it to bulge into a spherical shape. Figure 13 As shown, the maximum diameter L1 of the airbag-802 is greater than the width L2 at the connection point between the airbag-802 and the liner-801. Therefore, the associative groove 9 formed on the cement body 4 will have a shape that is small at the opening and large inside (e.g., ...). Figure 14 As shown), after the cement body 4 solidifies, the gas in the air bladder 802 is released. At this time, the air bladder 802 becomes deflated and sticks to the lining block 801, which is conducive to the cement body 4 being removed from the pouring cavity. like Figure 16 , Figure 17 As shown, the overmolding mold 2 is provided with a second liner 12 and a second airbag 13. The second liner 12 is fixedly installed on the inner wall of the overmolding cavity, and the second airbag 13 is fixedly installed on the second liner 12. The inner cavity of the second airbag 13 is connected to an external air pump through an air passage 14. Figures 16-17 As shown, air passage 2 14 is formed on upper mold 2 201 and lower mold 2 202. The number of air passage 2 14 matches the number of airbags 2 13 (and the number and position of airbags 2 13 also correspond one-to-one with the associative grooves 9). The end of air passage 2 14 away from airbag 1 802 is connected to an external air pump. The operation process of airbag 2 13 is the same as that of airbag 1 802. Under the operation of external gas, the external air pump injects gas into the inner cavity of airbag 2 13 through air passage 2 14. At this time, airbag 2 1 3. Inflate to release the gas in airbag 13. At this time, airbag 13 becomes deflated. During the cycle of inflating and deflation of airbag 13, when inflating, airbag 13 inflates towards the associating groove 9. Airbag 13 pushes the fluid plastic into the interior of the associating groove 9, thereby ensuring that the associating groove 9 is filled with fluid plastic and avoiding the occurrence of air pockets in the associating groove 9. After the cycle of inflating and deflation of airbag 13 is repeated several times, the gas in airbag 13 is discharged and deflated. Then, it stands still and waits for the fluid plastic to solidify. In addition, the added airbag 2 13 may cause the surface of the plastic layer 10 to be uneven. The surface of the plastic layer 10 will be polished later using a polishing tool.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate and not limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the present invention without departing from the spirit and scope of the present invention. Any modifications or partial substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A production equipment for low-temperature polyurethane foam molding in cement kettlebell applications, characterized in that, Including the body casting mold (1) and the rubber coating mold (2); The casting mold (1) for the cement body includes an upper mold (101) and a lower mold (102). The upper mold (101) and the lower mold (102) are provided with forming grooves (103) on their opposite sides. The lower mold (102) is provided with a positioning groove (104) for positioning the metal handle (3) on one side of the forming groove (103). The upper mold (101) is provided with a pressing surface (105) corresponding to the positioning groove (104). When the upper mold (101) and the lower mold (102) are closed, the two forming grooves (103) are spliced ​​together to form a casting cavity for casting the cement body. The metal handle (3) is pressed into the inside of the positioning groove (104) by the pressing surface (105) and both ends of the metal handle (3) extend into the casting cavity. The rubber-coating mold (2) includes an upper mold (201) and a lower mold (202). The upper mold (201) and the lower mold (202) are provided with forming grooves (203) on their opposite sides. The upper mold (201) and the lower mold (202) are provided with clamping grooves (204) on one side of the forming grooves (203) to clamp the metal handle (3). When the upper mold (201) and the lower mold (202) are closed, the two forming grooves (203) are spliced ​​together to form a rubber-coating cavity. The metal handle (3) is clamped inside the clamping groove (204) and a rubber-coating void is formed between the cement body (4) and the rubber-coating cavity. The side wall of the forming groove (103) is provided with multiple protrusions (8). When the cement body (4) is formed in the casting cavity, the outer wall of the cement body (4) forms an associative groove (9) at the position of the protrusion (8). The protrusion (8) includes a liner (801) and an airbag (802). The liner (801) is fixedly installed on the inner wall of the casting cavity, and the airbag (802) is fixedly installed on the liner (801). The inner cavity of the airbag (802) is connected to an external air pump through an air passage (11). The overmolding mold (2) is provided with a second liner (12) and a second airbag (13). The second liner (12) is fixedly installed on the inner wall of the overmolding cavity, and the second airbag (13) is fixedly installed on the second liner (12). The inner cavity of the second airbag (13) is connected to an external air pump through an air passage (14). The maximum diameter of airbag one (802) is greater than the width of the connection position between airbag one (802) and liner one (801); After the second airbag (13) inflates and deflates several times, the gas inside the second airbag (13) is expelled and deflated, and then it is left to stand still and wait for the fluid plastic to solidify.

2. The production equipment for low-temperature polyurethane foam molding in cement kettlebell applications according to claim 1, characterized in that, The bottom of the forming groove (103) is fixedly connected to a positioning post (5). When the cement body (4) is formed in the casting cavity, the outer wall of the cement body (4) forms a groove at the position of the positioning post (5). The bottom of the lower mold (202) is fixedly connected to a positioning post (6). When the cement body (4) is placed in the rubber coating cavity, the positioning post (6) is inserted into the groove on the outer wall of the cement body (4).

3. The production equipment for low-temperature polyurethane foam molding in cement kettlebell applications according to claim 1, characterized in that, The upper mold (101) and the lower mold (102) have overflow grooves (7) for guiding the overflowing cement on their opposite surfaces. The overflow grooves (7) are distributed along the contour of these forming grooves (103).

4. A method for applying the production equipment according to any one of claims 1-3 in low-temperature polyurethane foam molding to cement kettlebells, characterized in that, Includes the following steps: Step 1: Laser process the metal handle (3), bend the metal handle (3) into a tube and perform surface treatment; Step 2: Place the metal handle (3) in the positioning groove (104), close the upper mold (101) and the lower mold (102), pour fluid cement into the pouring cavity, the cement solidifies and forms a cement body (4), and the metal handle (3) is embedded in the cement body (4). Step 3: Place the cement body (4) in the rubber-coating cavity, close the upper mold 2 (201) and the lower mold 2 (202), and use the clamping groove (204) to clamp the metal handle (3) to fix the position of the cement body (4) and form a rubber-coating void layer. Step 4: Inject fluid plastic into the encapsulation void to encapsulate the cement body (4); Step 5: After the fluid plastic fills the plastic void and is formed at low temperature, a plastic layer (10) is formed to wrap the cement body (4), thus completing the kettlebell forming.

5. The method for applying low-temperature polyurethane foam molding to cement kettlebells according to claim 4, characterized in that, In steps one and two, the end of the metal handle (3) is uniformly provided with multiple elongated holes (301) and / or multiple thorns.

6. The method for applying low-temperature polyurethane foam molding to cement kettlebells according to claim 4, characterized in that, In step four, the plastic layer (10) is made of polyurethane foam or PVC epoxy resin.

7. The method for applying low-temperature polyurethane foam molding to cement kettlebells according to claim 6, characterized in that, In step five, the temperature of the polyurethane foam overmolding mold is no higher than 100°C, and the molding time is no more than five minutes.

8. The method for applying low-temperature polyurethane foam molding to cement kettlebells according to claim 7, characterized in that, In step five, the temperature of the polyurethane foam overmolding mold is 60°C, and the low-temperature molding time is three minutes.

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