A protective box injection mold

Abstract

The utility model relates to a production technical field of trigger type measuring head, especially in a kind of protective box injection mould, including upper die plate and lower die plate, recessed box body recess and cover recess are provided on the upper die plate, the box body boss and cover boss are provided on the lower die plate, when the upper die plate and lower die plate mutually buckle, box body boss is formed box body injection cavity by being inserted into box body recess, cover boss is formed cover injection cavity by being inserted into cover recess, lower die plate is provided with shunt, at least two protective box injection flow grooves are provided in one end of shunt, and protective box injection flow groove is respectively aligned box body boss and cover boss.In the utility model, by the cavity of box body, cover and measuring head shell integrated in upper and lower die plate, and material flow is filled simultaneously using shunt, the one-shot injection molding of protective box assembly and key supporting parts is realized, the production cycle is greatly shortened, equipment utilization is improved, and comprehensive production cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of trigger-type probe manufacturing technology, and in particular to a protective box injection mold. Background Technology

[0002] Trigger probes are key components in modern precision coordinate measuring machines, CNC machine tools, and other equipment, and their accuracy and reliability directly affect the performance of the entire measurement system. Because the probe itself contains delicate electronic and mechanical components, it is very delicate. Therefore, it needs to be equipped with a special protective box (usually including a box body and a cover) to prevent damage from impacts, dust, and moisture during transportation, storage, and when not in use.

[0003] Currently, these protective boxes and their internal trigger probe housings are typically manufactured using injection molding. However, existing injection molds and production methods have several significant drawbacks: Low production efficiency: The traditional approach involves developing separate molds for the box body, cover, and probe housing of the protective case, and then performing injection molding multiple times. This method not only results in high mold costs and the use of multiple injection molding machines, but also a long production cycle and low overall efficiency. Multiple clamping and molding processes also increase the risk of cumulative errors in part dimensions.

[0004] Product fit precision issues: The box body and the cover plate are a pair of components that need to fit tightly. If they are produced separately in different molds or different batches, slight differences in mold precision and injection molding process parameters (such as shrinkage rate) will lead to problems such as the final molded box body and cover plate fitting too loosely or too tightly, affecting the sealing performance and ease of use of the protective box.

[0005] Complex internal structure makes demolding difficult: To protect the precision probe, the protective box typically features complex reinforcing ribs, support plates, and side support plates to improve overall strength and impact resistance. Existing mold ejection systems are often relatively simple. During demolding, these complex internal structures are easily damaged by excessive adhesion or clamping forces, leading to a decrease in product yield. Utility Model Content

[0006] In view of the technical problems existing in the background art, the utility model provides a protective box injection mold to solve the above-mentioned problems.

[0007] To achieve the above objectives, the technical solution provided by this utility model is as follows: A protective box injection mold includes an upper mold plate and a lower mold plate. The upper mold plate has recessed box body grooves and cover plate grooves. The lower mold plate has protruding box body protrusions and cover plate protrusions. When the upper and lower mold plates are engaged, the box body protrusions extend into the box body grooves to form a box body injection cavity, and the cover plate protrusions extend into the cover plate grooves to form a cover plate injection cavity. The box body injection cavity and the cover plate injection cavity are connected. The lower mold plate has a flow divider block. One end of the flow divider block has at least two protective box injection grooves, which are respectively aligned with the box body protrusions and the cover plate protrusions. The flow divider block has an injection pipe that passes through the interior of the upper mold plate.

[0008] Preferably, the system also includes a support box, which is hollow inside and is located at the lower end of the lower template. The support box contains a lifting structure that is connected to the lower template.

[0009] Preferably, the box body protrusion is provided with a plurality of first channels for injection molding the internal reinforcing ribs of the box body, and the middle part of the box body protrusion is provided with a second channel for injection molding the internal support plate of the box body.

[0010] Preferably, the lifting structure includes a lifting plate and a plurality of ejector pins disposed on the lifting plate. A plurality of ejector pin holes are provided through the lower template. The ejector pin holes are disposed on the box body protrusion and are arranged circumferentially along the box body protrusion. The ejector pins pass through the support box and are connected in the ejector pin holes. The ejector pins are flush with the upper surface of the box body protrusion.

[0011] Preferably, the lifting structure further includes several push rods disposed on the lifting plate. The push rods include a first push rod, a second push rod, and a third push rod. The box body protrusion is provided with a push rod hole I. The first push rod is connected to the push rod hole I. The push rod hole I is connected to one of the first channels. When the first push rod is connected to the box body protrusion, the push rod hole I and the first channel form a channel that can be injection molded into the internal side support plate of the box body. The lower template is provided with a push rod hole II. The push rod hole II is disposed at the injection cavity position of the box body. The second push rod is connected to the push rod hole II. The lower template is provided with a push rod hole III. The push rod hole III is disposed at the injection cavity position of the cover plate. The third push rod is connected to the push rod hole III position.

[0012] Preferably, a probe housing injection molding structure is provided between the upper template and the lower template. The lower end of the upper template is recessed with a first housing injection molding groove, and the upper end of the lower template is recessed with a second housing injection molding groove. The first housing injection molding groove and the second housing injection molding groove together form the shape of the probe housing.

[0013] Preferably, the lower template is provided with a shell injection groove, which is connected to the second shell injection groove. The flow divider block is provided with a three-way hole, one of which is connected to the injection pipe, one of which is connected to the protective box injection groove, and another of which is connected to the shell injection groove.

[0014] Preferably, a groove is provided on the lower template, the groove is connected to the injection groove of the second outer shell, and a baffle is slidably connected in the groove. The baffle includes a stop block and an inner rod. The stop block and the end of the injection groove of the second outer shell are fitted together, and the inner rod extends into the injection groove of the second outer shell.

[0015] Preferably, the ejector pin also passes through the lower template and connects to the injection groove of the second housing.

[0016] Preferably, the system also includes a top plate, which is detachably connected to the upper end of the upper template. The top plate has a tapered hopper in the middle, and the hopper is connected to the injection molding pipe.

[0017] This utility model has the following advantages and beneficial effects: I. Significantly Improved Production Efficiency: By integrating the cavities of the box body, cover plate, and probe housing into the upper and lower molds, and utilizing a flow divider to achieve synchronous material flow filling, the protective box assembly and key supporting parts are injection molded in a single operation. This approach combines processes that previously required multiple sets of molds and multiple production steps, significantly shortening the production cycle, increasing equipment utilization, and reducing overall production costs.

[0018] 2. Same mold molding ensures the precision of mating components: The box body and cover are injection molded synchronously under the same mold, batch, and process parameters, fundamentally eliminating dimensional deviations caused by mold differences or process fluctuations. This ensures a precise fit between the mating surfaces of the box body and cover, improving the sealing reliability of the protective box and the user experience. Attached Figure Description

[0019] Figure 1 This is a structural diagram of a protective box injection mold proposed in this utility model; Figure 2 This is a structural diagram of the lower template of a protective box injection mold proposed in this utility model; Figure 3 This is a front view of the lower template of a protective box injection mold proposed in this utility model; Figure 4 This is a cross-sectional view of the flow divider block of a protective box injection mold proposed in this utility model; Figure 5 This is a structural diagram of a protective box for a protective box injection mold proposed in this utility model; Figure 6This is a schematic diagram of the upper template structure of a protective box injection mold proposed in this utility model; Figure 7 This is a schematic diagram of the lifting structure of a protective box injection mold proposed in this utility model.

[0020] Reference numerals: 1-Upper template, 11-Box body groove, 12-Cover plate groove, 13-First outer shell injection groove, 2-Lower template, 21-Box body protrusion, 211-First channel, 212-Second channel, 213-Ejector pin hole, 214-Ejector rod hole I, 215-Ejector rod hole II, 216-Ejector rod hole III, 22-Cover plate protrusion, 23-Second outer shell injection groove, 24-Shell body injection flow channel, 25 - Slide, 3- Diverter block, 31- Protective box injection flow channel, 32- Injection pipe, 4- Support box, 5- Lifting structure, 51- Lifting plate, 52- Ejector pin, 53- First ejector rod, 54- Second ejector rod, 55- Third ejector rod, 6- Barrier, 61- Stop block, 62- Inner hole rod, 7- Top plate, 71- Hopper, 8- Protective box, 81- Side support plate, 82- Reinforcing rib plate, 83- Support plate. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0023] Example like Figure 1-7 As shown, a protective box injection mold includes an upper mold plate 1, a lower mold plate 2, a support box 4, and a top plate 7. The support box 4 is located below the lower mold plate 2, providing stable support for the entire mold. Guide pillars are provided on the support box 4, and both the upper mold plate 1 and the lower mold plate 2 are provided with guide holes. The upper mold plate 1 and the lower mold plate 2 achieve precise alignment through the cooperation of the guide pillars and guide holes. A lifting structure 5 is provided inside the support box 4 for ejecting the product from the mold after injection molding.

[0024] like Figure 1 , Figure 6As shown, the upper mold plate 1 is made of high-strength mold steel, and its lower surface is precision machined with recessed box body groove 11 and cover plate groove 12. The shape of the box body groove 11 matches the outer contour of the protective box 8, and the shape of the cover plate groove 12 matches the outer contour of the cover plate of the protective box 8. The two grooves are interconnected to form a complete injection molding cavity.

[0025] like Figures 2-6 As shown, the lower template 2 is positioned below the upper template 1, and its upper surface is provided with a box body protrusion 21 and a cover plate protrusion 22. The shape of the box body protrusion 21 matches the internal cavity of the protective box 8, and the shape of the cover plate protrusion 22 matches the internal cavity of the cover plate of the protective box 8. When the upper template 1 and the lower template 2 are engaged, the box body protrusion 21 precisely extends into the box body groove 11 to form the box body injection cavity, and the cover plate protrusion 22 precisely extends into the cover plate groove 12 to form the cover plate injection cavity. The two injection cavities are connected through a flow channel to achieve simultaneous injection molding.

[0026] like Figures 2-6 As shown, a flow divider block 3 is detachably installed on the upper surface of the lower template 2. The flow divider block 3 has a T-shaped hole machined inside. At least two protective box injection channels 31 are connected to one end of the flow divider block 3. These protective box injection channels 31 are recessed on the upper surface of the lower template 2, aligning with the positions of the box body protrusion 21 and the cover plate protrusion 22, respectively. One protective box injection channel 31 communicates with the box body injection cavity, and the other communicates with the cover plate injection cavity. An injection pipe 32 is connected to the upper part of the flow divider block 3, penetrating the interior of the upper template 1. One hole in the flow divider block 3 communicates with the injection pipe 32, and another hole communicates with the protective box injection channels 31. Molten plastic is ejected from the injection molding machine nozzle into the injection pipe 32 and flows into the box body injection cavity and the cover plate injection cavity through the protective box injection channels 31, respectively.

[0027] like Figure 2 , 3 As shown in Figure 5, the box body protrusion 21 is provided with several first channels 211, which are used for injection molding the reinforcing ribs 82 inside the box body. A second channel 212 is also provided in the middle of the box body protrusion 21 for injection molding the support plate 83 inside the box body. The depth and width of these channels are precisely machined according to product design requirements to ensure that the injection-molded reinforcing ribs 82 and support plate 83 have sufficient strength.

[0028] like Figure 1 , Figure 2 , Figure 3 , Figure 7As shown, the support box 4 is a welded steel structure with a hollow interior, providing installation space for the lifting structure 5. The bottom of the support box 4 is mounted on the worktable of the injection molding machine. The lower template 2 is located at the upper end of the support box 4, and the two can be connected by bolts. The lifting structure 5 includes a lifting plate 51, ejector pins 52, and ejector rods. The lifting plate 51 is located inside the support box 4 and is connected to the hydraulic cylinder on the injection molding machine, allowing it to move up and down within the support box 4 under the drive of the hydraulic cylinder. Several ejector pins 52 are mounted on the lifting plate 51. These ejector pins 52 are made of high-strength mold steel and have a hardened surface. Several ejector pin holes 213 are provided through the lower template 2. These ejector pin holes 213 are distributed on the box body protrusions 21 and are evenly arranged around the circumference of the box body protrusions 21. The ejector pin 52 passes through the support box 4 and is precisely inserted into the ejector pin hole 213. The end of the ejector pin 52 is flush with the upper surface of the box protrusion 21. When the hydraulic cylinder drives the lifting plate 51 to rise, the ejector pin 52 extends out from the ejector pin hole 213. A guide rod is provided between the lifting plate 51 and the support box 4 to make the lifting plate 51 stable during movement.

[0029] The push rods include a first push rod 53, a second push rod 54, and a third push rod 55. The box body protrusion 21 is provided with a push rod hole I 214, which penetrates the lower template 2. The first push rod 53 is precisely fitted into the push rod hole I 214. The push rod hole I 214 is connected to one of the first channels 211. When the first push rod 53 is fitted with the box body protrusion 21, the push rod hole I 214 and the first channel 211 together form a complete channel for the internal side support plate 81 of the injection molded box body. The lower mold plate 2 is also provided with ejector pin holes II 215 and III 216. Ejector pin hole II 215 is located at the injection cavity of the box body, and ejector pin hole III 216 is located at the injection cavity of the cover plate. Similarly, ejector pin holes II 215 and III 216 pass through the lower mold plate 2. The second ejector pin 54 is connected in ejector pin hole II 215, and the third ejector pin 55 is connected in ejector pin hole III 216. The hydraulic cylinder of the injection molding machine drives the lifting plate 51 of the lifting structure 5 to move upward. During this process, the ejector pins 52, the first ejector pin 53, the second ejector pin 54 and the third ejector pin 55 arranged in different positions work together to apply ejection force synchronously from key parts such as the main body of the box body, the side of the box body and the side of the cover plate, so as to stably and evenly eject the injection-molded protective box 8 from the mold cavity and achieve complete demolding.

[0030] like Figure 2 , 3As shown in Figure 6, a probe housing injection molding structure is also integrated between the upper mold plate 1 and the lower mold plate 2. Specifically, the lower end of the upper mold plate 1 has a first housing injection groove 13, and the corresponding position on the upper end of the lower mold plate 2 has a second housing injection groove 23. When the upper and lower mold plates are closed, these two grooves precisely align to form a complete probe housing injection molding cavity. The shape of the first housing injection groove 13 matches the shape of the upper half of the probe housing, and the shape of the second housing injection groove 23 matches the shape of the lower half of the probe housing.

[0031] The lower mold plate 2 is also machined with a shell injection groove 24, which is connected to the second shell injection groove 23. One of the holes inside the flow divider block 3 is connected to the shell injection groove 24. When the molten plastic is ejected from the injection molding machine nozzle into the injection pipe 32, the molten plastic enters the hole and flows to the shell injection groove 24 and the protective box injection groove 31 respectively, realizing the simultaneous injection of molten plastic. This design allows the protective box 8 and the probe shell to be injection molded in the same mold in one go, which greatly improves production efficiency.

[0032] A groove 25 is provided on the lower template 2, which communicates with the second housing injection groove 23. A stop 6 is slidably connected within the groove 25, and the stop 6 includes a stop block 61 and an inner rod 62. The shape of the stop block 61 matches the groove 25, allowing it to slide smoothly within the groove 25 and be positioned within it by bolts. The inner rod 62 extends from one side of the stop block 61, and when the stop block 61 and the end of the second housing injection groove 23 are engaged, the inner rod 62 is precisely inserted into the second housing injection groove 23. When the mold is closed, the stop block 61 closes the end of the second housing injection groove 23, and the stop 6 serves to separate and position, ensuring that the injection-molded probe housing has a precise internal structure.

[0033] The ejector pins 52 also extend through the lower mold plate 2 into the second housing injection groove 23 for ejecting the probe housing product after injection molding. The placement of these ejector pins 52 is carefully designed to avoid affecting the appearance and quality of the product, while ensuring a uniform distribution of ejection force.

[0034] The top plate 7 is detachably connected to the upper end of the upper mold plate 1 by bolts. A hopper 71 is tapered in the middle of the top plate 7, and the lower opening of the hopper 71 is connected to the injection pipe 32. The tapered design of the hopper 71 facilitates the smooth flow of molten plastic, preventing stagnation and degradation. The top plate 7 is made of heat-insulating material to reduce heat loss and ensure temperature stability during the injection molding process.

[0035] Working principle: After mold closing, the injection molding machine injects molten plastic into the manifold block 3 through the hopper 71 and injection pipe 32. After being manifolded, the molten plastic simultaneously fills the injection cavities of the box body, the cover plate, and the probe housing. After pressure holding and cooling, the injection molding machine drives the upper mold plate 1 to open the mold and remove the blocking parts 6. Subsequently, the hydraulic cylinder of the injection molding machine pushes the lifting plate 51 upward. All the ejector pins 52 and ejector rods on the lifting plate 51 move synchronously, smoothly ejecting the molded box body, cover plate, and probe housing from their respective cavities, completing one injection cycle.

[0036] The above content is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. For those skilled in the art, the present utility model can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A protective box injection mold, characterized in that: The device includes an upper template and a lower template. The upper template has recessed box body grooves and cover plate grooves, while the lower template has protruding box body protrusions and cover plate protrusions. When the upper and lower templates are engaged, the box body protrusions extend into the box body grooves to form a box body injection cavity, and the cover plate protrusions extend into the cover plate grooves to form a cover plate injection cavity. The box body injection cavity and the cover plate injection cavity are connected. The lower template has a flow divider block, and one end of the flow divider block has at least two protective box injection grooves. The protective box injection grooves are respectively aligned with the box body protrusions and the cover plate protrusions. The flow divider block has an injection pipe that passes through the interior of the upper template.

2. The protective box injection mold according to claim 1, characterized in that: It also includes a support box, which is hollow inside and is located at the lower end of the lower template. The support box is equipped with a lifting structure that is connected to the lower template.

3. The protective box injection mold according to claim 2, characterized in that: The box body protrusion is provided with several first channels for injection molding the internal reinforcing ribs of the box body, and the middle of the box body protrusion is provided with a second channel for injection molding the internal support plate of the box body.

4. The protective box injection mold according to claim 2, characterized in that: The lifting structure includes a lifting plate and several ejector pins disposed on the lifting plate. Several ejector pin holes are provided through the lower template. The ejector pin holes are disposed on the box body protrusion and are arranged circumferentially along the box body protrusion. The ejector pins pass through the support box and are connected in the ejector pin holes. The ejector pins are flush with the upper surface of the box body protrusion.

5. The protective box injection mold according to claim 3, characterized in that: The lifting structure also includes several push rods disposed on the lifting plate. The push rods include a first push rod, a second push rod, and a third push rod. The box body protrusion is provided with a push rod hole I. The first push rod is connected to the push rod hole I. The push rod hole I is connected to one of the first channels. When the first push rod is connected to the box body protrusion, the push rod hole I and the first channel form a channel that can be injection molded into the internal side support plate of the box body. The lower template is provided with a push rod hole II. The push rod hole II is located at the injection cavity of the box body. The second push rod is connected to the push rod hole II. The lower template is provided with a push rod hole III. The push rod hole III is located at the injection cavity of the cover plate. The third push rod is connected to the push rod hole III.

6. The protective box injection mold according to claim 4, characterized in that: A probe housing injection molding structure is also provided between the upper template and the lower template. The lower end of the upper template is recessed with a first housing injection molding groove, and the upper end of the lower template is recessed with a second housing injection molding groove. The first housing injection molding groove and the second housing injection molding groove together form the shape of the probe housing.

7. The protective box injection mold according to claim 6, characterized in that: The lower template is provided with a shell injection molding channel, which is connected to the second outer shell injection molding groove. The inside of the diverter block is provided with a three-way hole, one of which is connected to the injection pipe, one of which is connected to the protective box injection molding channel, and another of which is connected to the shell injection molding channel.

8. The protective box injection mold according to claim 6, characterized in that: The lower template is provided with a sliding groove, which is connected to the second outer shell injection groove. A baffle is slidably connected in the sliding groove. The baffle includes a stop block and an inner rod. The stop block and the end of the second outer shell injection groove are fitted together, and the inner rod extends into the second outer shell injection groove.

9. The protective box injection mold according to claim 6, characterized in that: The ejector pin also passes through the lower template and connects to the injection groove of the second housing.

10. The protective box injection mold according to claim 1, characterized in that: It also includes a top plate, which is detachably connected to the upper end of the upper template. A hopper is provided in the middle of the top plate in a conical shape, and the hopper is connected to the injection pipe.

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