Forming die for heat conductivity coefficient test piece

Abstract

The invention relates to the technical field of heat conductivity coefficient test piece preparation, and provides a heat conductivity coefficient test piece forming mold which comprises a forming frame mold, a bottom plate is installed at the bottom end of the forming frame mold, the bottom plate and the forming frame mold are connected and fixed through fixing bolts, a support is installed on the forming frame mold, and the fixing bolts are installed on the support. A pressing plate is arranged above the forming frame mold and connected with a driving mechanism, the driving mechanism comprises a fixing disc installed on the support and a large gear installed in the fixing disc, and the top end of the large gear is connected with the output end of a driving motor at the top end of the support. By means of the driving mechanism, a driving motor is started, a large gear drives a small gear to rotate, a screw rod rotates, a movable block drives a pressing plate to move, and when the pressing plate moves downwards into a forming frame mold, the two ends of the two sides of the pressing plate are evenly stressed, kept horizontal and free of inclination, and a mortar-shaped mixture is flattened, so that the surface of the mortar-shaped mixture is even and flat; and the uneven condition is avoided.

Description

Technical Field

[0001] This invention relates to the field of thermal conductivity specimen preparation technology, and in particular to a thermal conductivity specimen molding die. Background Technology

[0002] Thermal conductivity specimens are thin sheets or block structures of solid materials used to test their thermal conductivity under constant temperature difference conditions. Their function is to serve as a standardized carrier to transfer heat in the testing instrument, thereby accurately measuring and representing the thermal conductivity of the material. Molding molds are required when processing thermal conductivity specimens.

[0003] When preparing thermal conductivity test specimens for powdered materials, the powdered material to be tested is first mixed with water in a specific ratio to prepare a mortar-like mixture. Then, a molding frame mold is used to cast the mortar-like mixture into shape. After the molded specimen hardens naturally, a solid mortar block is formed. The hardened mortar block is then placed in a thermal conductivity meter for thermal conductivity testing. However, in the existing molding frame mold, the surface of the specimen relies on manual smoothing during the specimen preparation process. Due to factors such as the operator's skill level and the force applied, it is difficult to ensure a uniform and flat surface, and unevenness is likely to occur. Since the thermal conductivity meter has extremely high requirements for the flatness of the specimen surface, an uneven specimen surface cannot be tightly fitted with the two pressure plates of the instrument, resulting in contact thermal resistance. The presence of contact thermal resistance will interfere with the normal heat transfer in the specimen, leading to errors in the temperature difference and heat transfer data monitored by the instrument. Ultimately, the measured thermal conductivity data is inaccurate and cannot truly reflect the thermal conductivity performance of the material.

[0004] To address the aforementioned issues, there is an urgent need for a thermal conductivity specimen molding die to meet the application requirements. Summary of the Invention

[0005] The purpose of this invention is to provide a thermal conductivity specimen molding die to solve the problem that existing molding frame dies have the defect of difficulty in controlling the surface flatness of the specimen during the specimen preparation process.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a thermal conductivity specimen molding die, comprising a molding frame die, a base plate installed at the bottom end of the molding frame die, the base plate being fixed to the molding frame die by fixing bolts, a bracket installed on the molding frame die, a pressure plate provided above the molding frame die, the pressure plate being connected to a driving mechanism, the driving mechanism comprising a fixed disk installed on the bracket, a large gear installed inside the fixed disk, the top end of the large gear being connected to the output end of a drive motor at the top of the bracket, small gears installed at both ends of the fixed disk, a screw installed at the bottom end of the small gear, a movable block threadedly connected to the screw, and fixed rods symmetrically installed at the bottom end of the movable block, both ends of the molding frame being provided with a striking structure, and an overflow hole being provided on the pressure plate, the overflow hole having an auxiliary structure inside.

[0007] Preferably, the forming frame mold is composed of a first frame and a second frame, with a connecting rod installed between the first frame and the second frame, and fixing parts symmetrically installed on the connecting rod.

[0008] The above structure allows for the rapid assembly of the first and second frames.

[0009] Preferably, the striking structure includes a limiting box, a cover plate, a first gear, a rack, a limiting bolt, a telescopic spring, a moving plate, a guide rod, a moving rod, a striking hammer, a cylindrical cam, and a positioning block. The limiting boxes are installed at both ends of the forming frame mold. A cover plate is installed at the top of the limiting box, and the cover plate is connected and fixed to the limiting box by the limiting bolt. A cylindrical cam is installed inside the limiting box. A first gear is installed at one end of the cylindrical cam, and a rack meshes with the first gear. The rack is connected to a pressure plate. A moving plate is installed on the cylindrical cam. A positioning block is installed inside the moving plate. Moving rods are installed on both sides of one end of the moving plate, and a striking hammer is installed at one end of each moving rod. Guide rods are installed at both ends inside the limiting box, and telescopic springs are sleeved on each guide rod.

[0010] By using the above structure, the molding frame mold is hammered to fill the edges and corners of the molding frame mold with mortar-like mixture, thus avoiding unevenness at the edges and corners of the thermal conductivity test piece.

[0011] Preferably, the side wall of the limiting box is symmetrically provided with through holes, and the diameter of the through holes is larger than the diameter of the moving rod.

[0012] Through the above structure, the through hole can play a certain limiting role in the moving rod, thereby improving its stability during movement.

[0013] Preferably, the telescopic spring is fixed between the moving plate and the inner wall of the limiting box, and the telescopic spring and the moving plate form a telescopic structure.

[0014] With the above structure, the telescopic spring can drive the moving plate back to its initial position.

[0015] Preferably, the cylindrical cam has a cam groove, and the bottom end of the positioning block is inserted into the cam groove and forms a sliding connection with it.

[0016] With the above structure, the positioning block slides along the cam groove, driving the moving plate to move, which in turn causes the moving rod to drive the hammer to reciprocate.

[0017] Preferably, the overflow hole consists of a lower hole and an upper hole, with the lower hole located at the bottom end of the upper hole.

[0018] Preferably, the diameter of the lower hole is smaller than the diameter of the upper hole, and the depth of the lower hole is smaller than the depth of the upper hole.

[0019] The above structure can quickly discharge excess mortar mixture and slow down the backflow of mortar mixture into the molding mold.

[0020] Preferably, the auxiliary structure includes a rotating shaft, a torsion spring, a baffle, and a limiting block. The rotating shaft is evenly installed on the inner wall of the bottom end of the upper hole. A torsion spring is sleeved on each rotating shaft. A limiting block is installed on each torsion spring, and a baffle is installed at one end of each limiting block.

[0021] The above structure can block the slurry mixture that has not been discharged from the overflow hole, preventing it from flowing back into the molding mold and causing unevenness on the surface of the thermal conductivity specimen.

[0022] Preferably, the baffles are arranged in a ring shape inside the upper hole.

[0023] The above structure can improve the blocking effect on the slurry-like mixture that has not been discharged from the overflow hole.

[0024] The present invention provides a molding die for a thermal conductivity specimen, the advantages of which are: The drive mechanism is set up to start the drive motor. The large gear drives the small gear to rotate, the screw rotates, and the movable block drives the pressure plate to move. When the pressure plate moves down into the forming frame mold, the two ends of the pressure plate are evenly stressed, keeping it horizontal and without tilting, and flattening the mortar-like mixture so that its surface is uniform and flat, avoiding unevenness. Furthermore, when the pressure plate moves down, the rack drives the first gear to rotate, the cylindrical cam rotates, the positioning block slides along the cam groove, driving the moving plate to move, causing the moving rod to drive the hammer to reciprocate, striking the forming frame mold, filling the edges and corners of the forming frame mold with mortar-like mixture, and avoiding unevenness at the edges and corners of the thermal conductivity test piece; Furthermore, when the pressure plate flattens the mortar mixture, the excess mortar mixture in the forming frame mold can be discharged through the overflow hole. The overflow hole has a structure that is larger at the top and smaller at the bottom, which can not only quickly discharge the excess mortar mixture, but also slow down the situation where the mortar mixture flows back into the forming frame mold. Furthermore, when the pressure plate is flattened, the excess slurry mixture presses against the baffle, causing the baffle to rotate and discharge the slurry mixture from the overflow hole. The torsion spring drives the limit block to rotate, returning the baffle to its initial position. The baffle can block the slurry mixture that has not been discharged from the overflow hole, preventing it from flowing back into the molding mold and causing unevenness on the surface of the thermal conductivity specimen. Attached Figure Description

[0025] Figure 1 This is a front view structural diagram of the present invention; Figure 2 This is a bottom-view structural diagram of the present invention; Figure 3 This is a front view structural diagram of the drive mechanism of the present invention; Figure 4 This is a front view cross-sectional structural diagram of the drive mechanism of the present invention; Figure 5 For the present invention Figure 1 Enlarged structural diagram at point A in the middle; Figure 6 This is a front cross-sectional view of the striking structure of the present invention; Figure 7 This is a partial structural diagram of the striking structure of the present invention; Figure 8 This is a front view schematic diagram of the pressure plate structure of the present invention; Figure 9 This is a front view cross-sectional structural diagram of the overflow hole of the present invention; Figure 10 This is a frontal cross-sectional view of the auxiliary structure of the present invention.

[0026] The following are the annotations in the diagram: 1. Pressure plate; 2. Forming frame mold; 21. First frame; 22. Second frame; 3. Connecting rod; 4. Striking structure; 401. Limiting box; 4011. Through hole; 402. Cover plate; 403. First gear; 404. Rack; 405. Limiting bolt; 406. Telescopic spring; 407. Moving plate; 408. Guide rod; 409. Moving rod; 410. Striking hammer; 411. Cylindrical cam; 4111. Cam groove; 412. Positioning block; 5. Base plate; 6. Bracket; 7. Drive mechanism; 701. Fixed plate; 702. Screw; 703. Movable block; 704. Fixed rod; 705. Drive motor; 706. Large gear; 707. Small gear; 8. Fixing bolt; 9. Fixing component; 10. Overflow hole; 1001. Lower hole; 1002. Upper hole; 11. Auxiliary structure; 1101. Rotating shaft; 1102. Torsion spring; 1103. Baffle; 1104. Limiting block. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Please see Figures 1-10 The present invention provides a molding die for a thermal conductivity test specimen, including a molding frame die 2.

[0029] In the existing molding mold 2, the surface of the specimen relies on manual smoothing during the specimen preparation process. Due to factors such as the operator's skill level and the force applied, it is difficult to ensure that the surface is uniform and flat, and unevenness is likely to occur. Since the thermal conductivity meter has extremely high requirements for the flatness of the specimen surface, an uneven specimen surface cannot be tightly fitted with the two pressure plates 1 of the instrument, which will generate contact thermal resistance. The presence of contact thermal resistance will interfere with the normal heat transfer in the specimen, resulting in errors in the temperature difference and heat transfer data monitored by the instrument. Ultimately, the measured thermal conductivity data is inaccurate and cannot truly reflect the thermal conductivity performance of the material.

[0030] Reference Figures 1-10As shown, the forming frame mold 2 is composed of a first frame 21 and a second frame 22. A connecting rod 3 is installed between the first frame 21 and the second frame 22, and fixing parts 9 are symmetrically installed on the connecting rod 3. A base plate 5 is installed at the bottom of the forming frame mold 2. The base plate 5 is connected and fixed to the forming frame mold 2 by fixing bolts 8. A bracket 6 is installed on the forming frame mold 2. A pressure plate 1 is set above the forming frame mold 2. An overflow hole 10 is opened on the pressure plate 1. The pressure plate 1 is connected to the drive mechanism 7. The drive mechanism 7 includes a fixed plate 701 installed on the bracket 6, a large gear 706 installed inside the fixed plate 701, the top end of the large gear 706 is connected to the output end of the drive motor 705 at the top of the bracket 6, small gears 707 installed at both ends of the fixed plate 701, a screw 702 installed at the bottom end of the small gear 707, a movable block 703 threadedly connected to the screw 702, and fixing rods 704 symmetrically installed at the bottom end of the movable block 703.

[0031] Both ends of the forming frame are equipped with striking structures 4. Each striking structure 4 includes a limiting box 401, a cover plate 402, a first gear 403, a rack 404, a limiting bolt 405, a telescopic spring 406, a moving plate 407, a guide rod 408, a moving rod 409, a striking hammer 410, a cylindrical cam 411, and a positioning block 412. The limiting boxes 401 are installed at both ends of the forming frame mold 2. A cover plate 402 is installed at the top of each limiting box 401, and the cover plate 402 is connected and fixed to the limiting box 401 by limiting bolts 405. A cylindrical cam 411 is installed inside the limiting box 401. A first gear 403 is installed at one end of the cylindrical cam 411, meshing with a rack 404 which is connected to a pressure plate 1. A moving plate 407 is installed on the cylindrical cam 411. A positioning block 412 is installed inside the movable plate 407. A cam groove 4111 is opened on the cylindrical cam 411. The bottom end of the positioning block 412 is inserted into the cam groove 4111 and forms a sliding connection with it. Movable rods 409 are installed on both sides of one end of the movable plate 407, and a hammer 410 is installed on one end of the movable rod 409. Through holes 4011 are symmetrically opened on the side wall of the limiting box 401, and the diameter of the through holes 4011 is larger than the diameter of the movable rods 409. Guide rods 408 are installed at both ends inside the limiting box 401. A telescopic spring 406 is sleeved on the guide rod 408. The telescopic spring 406 is fixed between the movable plate 407 and the inner wall of the limiting box 401. The telescopic spring 406 and the movable plate 407 form a telescopic structure. The telescopic spring 406 can push the movable plate 407 back to the initial position.

[0032] The powdered material to be tested is mixed with water in a specific ratio to prepare a mortar-like mixture. The prepared mortar-like mixture is poured into the molding frame mold 2. The drive motor 705 is started, and the large gear 706 drives the small gear 707 to rotate, causing the screw 702 to rotate. Due to the threaded connection, the movable block 703 drives the pressure plate 1 to move. When the pressure plate 1 moves down into the molding frame mold 2, both ends of the pressure plate 1 are evenly stressed, keeping it horizontal and without tilting, thus flattening the mortar-like mixture and making its surface uniform and flat, avoiding unevenness. In this case, when the pressure plate 1 moves down, the rack 404 drives the first gear 403 to rotate, the cylindrical cam 411 rotates, the positioning block 412 slides along the cam groove 4111, driving the moving plate 407 to move, so that the moving rod 409 drives the hammer 410 to reciprocate, and hammers the forming frame mold 2, so that the edges and corners of the forming frame mold 2 are filled with mortar-like mixture, avoiding unevenness at the edges and corners of the thermal conductivity test piece. When the pressure plate 1 flattens the mortar-like mixture, the excess mortar-like mixture in the forming frame mold 2 can be discharged through the overflow hole 10.

[0033] When the pressure plate 1 flattens the mortar-like mixture, the excess mortar-like mixture in the molding frame mold 2 can be discharged through the overflow hole 10. After the pressure plate 1 flattens the mortar-like mixture and its surface is smooth, the mortar-like mixture that has not been discharged from the overflow hole 10 will flow back into the molding frame mold 2, affecting the flatness of the thermal conductivity specimen.

[0034] Reference Figures 8-10 As shown, the overflow hole 10 is composed of a lower hole 1001 and an upper hole 1002. The lower hole 1001 is opened at the bottom end of the upper hole 1002. The diameter of the lower hole 1001 is smaller than the diameter of the upper hole 1002, and the depth of the lower hole 1001 is smaller than the depth of the upper hole 1002. An auxiliary structure 11 is provided inside the overflow hole 10. The auxiliary structure 11 includes a rotating shaft 1101, a torsion spring 1102, a baffle 1103, and a limiting block 1104. The rotating shaft 1101 is evenly installed on the inner wall at the bottom end of the upper hole 1002. A torsion spring 1102 is sleeved on each rotating shaft 1101. A limiting block 1104 is installed on each torsion spring 1102, and a baffle 1103 is installed at one end of each limiting block 1104. The baffles 1103 are distributed in a ring inside the upper hole 1002.

[0035] The overflow hole 10 is designed with a larger upper part and a smaller lower part, which can quickly discharge excess slurry mixture and reduce the backflow of slurry mixture into the molding mold 2. Excess slurry mixture presses against the baffle 1103, causing the baffle 1103 to rotate and discharge the slurry mixture from the overflow hole 10. The torsion spring 1102 drives the limiting block 1104 to rotate, so that the baffle 1103 returns to its initial position. The baffle 1103 can block the slurry mixture that has not been discharged from the overflow hole 10, preventing it from flowing back into the molding mold 2 and causing unevenness on the surface of the thermal conductivity specimen.

[0036] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A mold for forming a thermal conductivity specimen, comprising a forming frame mold (2); Its features are: The bottom end of the forming frame mold (2) is equipped with a base plate (5), and the base plate (5) is connected and fixed to the forming frame mold (2) by fixing bolts (8). A bracket (6) is installed on the forming frame mold (2), and a pressure plate (1) is provided above the forming frame mold (2). The pressure plate (1) is connected to the drive mechanism (7). The drive mechanism (7) includes a fixed disk (701) mounted on a bracket (6), a large gear (706) mounted inside the fixed disk (701), the top end of the large gear (706) being connected to the output end of a drive motor (705) at the top of the bracket (6), small gears (707) mounted on both sides of the fixed disk (701), a screw (702) mounted on the bottom end of the small gear (707), a movable block (703) threadedly connected to the screw (702), and fixed rods (704) symmetrically mounted on the bottom end of the movable block (703). Both ends of the molding frame are provided with a striking structure (4), and an overflow hole (10) is provided on the pressure plate (1). An auxiliary structure (11) is provided inside the overflow hole (10).

2. The thermal conductivity specimen molding die according to claim 1, characterized in that: The forming frame mold (2) is composed of a first frame (21) and a second frame (22). A connecting rod (3) is installed between the first frame (21) and the second frame (22), and a fixing piece (9) is symmetrically installed on the connecting rod (3).

3. The thermal conductivity specimen molding die according to claim 1, characterized in that: The striking structure (4) includes a limiting box (401), a cover plate (402), a first gear (403), a rack (404), a limiting bolt (405), a telescopic spring (406), a moving plate (407), a guide rod (408), a moving rod (409), a striking hammer (410), a cylindrical cam (411), and a positioning block (412). The limiting boxes (401) are installed at both ends of the forming frame mold (2). The top of the limiting box (401) is equipped with a cover plate (402). The cover plate (402) is connected and fixed to the limiting box (401) by the limiting bolt (405). A cylindrical cam is installed inside the limiting box (401). A wheel (411) is provided with a first gear (403) installed at one end of the cylindrical cam (411), a rack (404) meshing with the first gear (403), the rack (404) being connected to the pressure plate (1), a movable plate (407) being installed on the cylindrical cam (411), a positioning block (412) being installed inside the movable plate (407), movable rods (409) being installed on both sides of one end of the movable plate (407), and a hammer (410) being installed at one end of the movable rod (409), and guide rods (408) being installed at both ends inside the limiting box (401), and a telescopic spring (406) being sleeved on the guide rods (408).

4. The thermal conductivity specimen molding die according to claim 3, characterized in that: The limiting box (401) has symmetrical through holes (4011) on its side wall, and the diameter of the through holes (4011) is larger than the diameter of the moving rod (409).

5. The thermal conductivity specimen molding die according to claim 3, characterized in that: The telescopic spring (406) is fixed between the moving plate (407) and the inner wall of the limiting box (401), and the telescopic spring (406) and the moving plate (407) constitute a telescopic structure.

6. The thermal conductivity specimen molding die according to claim 3, characterized in that: The cylindrical cam (411) has a cam groove (4111), and the bottom end of the positioning block (412) is inserted into the cam groove (4111) and forms a sliding connection with it.

7. The thermal conductivity specimen molding die according to claim 1, characterized in that: The overflow hole (10) is composed of a lower hole (1001) and an upper hole (1002), with the lower hole (1001) located at the bottom of the upper hole (1002).

8. The thermal conductivity specimen molding die according to claim 7, characterized in that: The diameter of the lower hole (1001) is smaller than the diameter of the upper hole (1002), and the depth of the lower hole (1001) is smaller than the depth of the upper hole (1002).

9. A molding die for a thermal conductivity specimen according to claim 1, characterized in that: The auxiliary structure (11) includes a rotating shaft (1101), a torsion spring (1102), a baffle (1103), and a limiting block (1104). The rotating shaft (1101) is evenly installed on the inner wall of the bottom end of the upper hole (1002). A torsion spring (1102) is sleeved on each rotating shaft (1101). A limiting block (1104) is installed on each torsion spring (1102), and a baffle (1103) is installed on one end of each limiting block (1104).

10. A molding die for a thermal conductivity specimen according to claim 9, characterized in that: The baffle (1103) is arranged in a ring inside the upper hole (1002).

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