Forming device for hard concrete small prefabricated part test piece

Abstract

The invention provides a forming device for a hard concrete small prefabricated part test piece, and relates to the technical field of concrete forming, the forming device comprises a base, the upper end face of the base is provided with mounting racks, the upper end face of each mounting rack is provided with a top plate, and four groups of guide rods are arranged between the mounting racks; the device further comprises a forming mechanism, the forming mechanism comprises second hydraulic cylinders, the two second hydraulic cylinders are arranged on the upper end face of the top plate, the telescopic ends of the second hydraulic cylinders are connected with a sliding frame, the sliding frame is slidably connected with the guide rods, a plurality of limiting grooves are formed in the surface of the sliding frame, and four lifting plates are arranged in the sliding frame. According to the concrete test piece forming device, the problems that in the traditional concrete test piece forming process, manual vibration is needed, vibration is insufficient, and the compactness is uneven are solved, and the test piece forming quality and the production efficiency are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of concrete forming, more particularly, it relates to a dry hard concrete small precast component test specimen forming device. BACKGROUND

[0002] In the current concrete forming technology, the production of dry hard concrete small precast component test specimens usually requires vibrating the concrete to ensure the uniformity and compactness of the concrete. In the traditional process, the vibrating operation is carried out by manually inserting the vibrating tool into the concrete mold. Although this method can meet the needs of small-scale production, it has some obvious shortcomings. First, manual operation requires a lot of time and effort. During the operation, the worker needs to continuously insert the vibrating tool into the mold and repeatedly vibrate, which is a high-intensity and repetitive labor for the workers. Second, manual vibration has the risk of uneven operation. Due to human factors, the frequency and intensity of vibration may not be consistent, which can not completely eliminate the air bubbles and voids in the concrete, affecting the compactness and structural performance of the concrete. This instability may result in the strength of the molded test specimen not meeting the standard, and even may affect the quality and safety of the final precast component.

[0003] In addition, with the increase of production demand, the traditional manual vibration method is particularly unsuitable for mass production, especially in situations where a large number of identical or similar precast components need to be produced. Manual operation not only has low efficiency, but also can cause unstable product quality due to the fatigue and non-standard operation of the operators. In large-scale production, the speed and quality control of manual vibration are difficult to achieve ideal standards. In order to improve production efficiency, reduce labor costs and ensure product consistency, it is urgent to design a more efficient forming device. SUMMARY

[0004] (I) Technical problems solved

[0005] In view of the problems existing in the prior art, the present application provides a dry hard concrete small precast component test specimen forming device to solve the technical problems mentioned in the background.

[0006] (II) Technical solutions

[0007] To achieve the above objectives, the present invention provides the following technical solution: a molding device for small precast component specimens of dry-hard concrete, comprising a base, an mounting frame on the upper surface of the base, a top plate on the upper surface of the mounting frame, and four sets of guide rods between the mounting frames; further comprising a molding mechanism, the molding mechanism comprising a second hydraulic cylinder, two sets of second hydraulic cylinders on the upper surface of the top plate, a sliding frame connected to the telescopic end of the second hydraulic cylinder, the sliding frame being slidably connected to the guide rods, multiple sets of limiting grooves on the surface of the sliding frame, four sets of lifting plates inside the sliding frame, limiting rods at the four corners of the upper surface of the lifting plates, the limiting rods being slidably connected to the limiting grooves; further comprising a vibration mechanism, the vibration mechanism comprising a fixed pipe, four sets of fixed pipes fixedly connected to the upper surface of the lifting plates, and threaded sleeves threadedly connected to the outer surface of the fixed pipes.

[0008] Preferably, two sets of first hydraulic cylinders are provided between the mounting brackets, and the extension and retraction ends of the first hydraulic cylinders are connected to mold boxes. The mold boxes are slidably connected to guide rods. Multiple sets of forming grooves and spacing grooves are opened in the mold boxes. Multiple sets of pressure blocks adapted to the forming grooves are provided on the lower end face of the sliding bracket.

[0009] Preferably, the mold box sidewall is provided with a first vibration motor, and the upper surface of the lifting plate is provided with a second vibration motor.

[0010] Preferably, a fixed cylinder is provided below the lifting plate, the fixed cylinder is fixedly connected to the sliding frame, a first hydraulic cavity is formed at the center of the fixed cylinder, four sets of second hydraulic cavities are formed around the first hydraulic cavity, and the first hydraulic cavity and the second hydraulic cavity are connected by a connecting groove.

[0011] Preferably, the lower end face of the lifting plate is provided with a first connecting spring, the other end of the first connecting spring is connected to a slide rod, the slide rod is slidably connected to the first hydraulic cavity, and the lower end face of the lifting plate is provided with a second connecting spring, the second connecting spring is fixedly connected to the upper end face of the fixed cylinder.

[0012] Preferably, the slide rod is provided with a suction spring, and the other end of the suction spring is connected to a sliding plate. The sliding plate is slidably connected to the inner side wall of the slide rod. The second hydraulic chamber is provided with a push spring, one end of which is fixedly connected to the top of the inner side wall of the second hydraulic chamber, and the other end is connected to a push block. The push block is slidably connected to the second hydraulic chamber.

[0013] Preferably, a connecting pipe is fixedly connected to the bottom of the first hydraulic chamber, a sealing disc is sealed to the top of the connecting pipe, four sets of clamping rods are provided on the lower end face of the sealing disc, a compression spring is connected to the lower end face of the clamping rods, and a return groove is provided at the center of the sealing disc.

[0014] Preferably, the lower end of the connecting tube is threaded with a threaded rod, the upper end face of the threaded rod is provided with a receiving plate, the other end of the compression spring is fixedly connected to the upper end face of the receiving plate, the outer side wall of the receiving plate is provided with a sliding sleeve, the sliding sleeve is slidably connected to the inner side wall of the connecting tube, and the upper end face of the sliding sleeve is provided with a groove that matches the locking rod.

[0015] Preferably, the lower end face of the lifting plate is provided with a sliding tube, the upper end face of the sliding tube abuts against the lower end face of the lifting plate, the lower end face of the fixed tube is provided with a vibration spring, and the other end of the vibration spring is fixedly connected to the bottom of the inner side wall of the sliding tube.

[0016] Preferably, a pull rod is slidably connected inside the fixed tube, the upper end face of the threaded sleeve abuts against the side wall of the pull rod, and the end of the pull rod is fixedly connected to a vibration spring inside the sliding tube.

[0017] (III) Beneficial Effects

[0018] Compared with the prior art, the present invention provides a molding device for small precast component specimens of dry-hard concrete, which has the following beneficial effects: This molding device for small precast component specimens of dry-hard concrete solves the problems of manual vibration, insufficient vibration, and uneven density in the traditional concrete specimen molding process by using a hydraulically driven vibration system, thereby improving the quality of specimen molding and production efficiency. The device adopts a dual hydraulic cylinder drive system, which provides a stable and reliable power source for molding operations, effectively avoiding the quality differences of specimens caused by improper manual operation, and improving the standardization and quality reliability of specimen molding.

[0019] The core of the device lies in its hydraulically driven vibration compaction mechanism. This mechanism utilizes the pressure transmission principle of hydraulic oil within a sealed chamber. When the vibration motor operates, the up-and-down vibration of the lifting plate transmits the vibration force to the slide rod through the first connecting spring. The reciprocating motion of the slide rod within the first hydraulic chamber generates pressure changes, driving the hydraulic oil to circulate between the first and second hydraulic chambers. The pressure pulses generated during this flow are effectively converted into vibration force, which acts directly on the concrete slurry in the forming tank through the slide tube, achieving deep vibration and compaction. Compared with traditional mechanical vibration methods, this hydraulically driven vibration compaction system generates a more uniform and stable vibration force, resulting in more thorough compaction. It can effectively eliminate air bubbles and voids inside the concrete, improving the density, compressive strength, and durability of the specimens.

[0020] The flow control system, consisting of a sealing disc and a connecting pipe, not only controls the hydraulic oil flow but also creates an intermittent flow release mechanism through the cooperation of the lever and slot. During vibration, the sealing disc automatically opens when impacted by hydraulic oil, allowing hydraulic oil to flow into the connecting pipe. When the pressure is released, the sealing disc automatically seals under the action of the compression spring. This cyclical opening and closing process ensures effective pressure transmission with each vibration while preventing excessive hydraulic oil loss. The design of the sliding sleeve and slot further refines the flow control. By adjusting the threaded rod, the flow rate of hydraulic oil can be precisely set each time, thereby controlling the descent of the sliding rod and lifting plate and adjusting the vibration depth. This adjustable design allows the device to adapt to the molding requirements of specimens of different specifications and depths, enhancing the versatility and flexibility of the equipment.

[0021] The pressure buffer system composed of the suction spring and the sliding plate effectively solves the pressure fluctuation problem in the hydraulic system. When the pressure in the first hydraulic chamber is too high, the sliding plate moves upward under the action of the suction spring, increasing the chamber volume, absorbing excess pressure, and preventing system overload. When the pressure is insufficient, the suction spring rebounds and pushes the sliding plate downward to compensate for the volume change and ensure the stability of the system pressure. This pressure regulation mechanism not only protects the safe operation of the hydraulic system, but also improves the stability and consistency of the vibration force, making the quality of each molded specimen more uniform and reliable.

[0022] The fixed tube drives the tie rod to vibrate, and the tie rod transmits the vibration to the slide tube through the vibration spring. The elasticity of the vibration spring effectively amplifies the vibration amplitude of the slide tube, enhancing the vibration effect. The tension of the tie rod on the slide tube can be controlled by adjusting the threaded sleeve, thus adjusting the vibration intensity. This adjustable amplitude amplification design allows the device to adjust the vibration parameters according to different concrete mix proportions and consistency requirements. The return channel design realizes the recycling of hydraulic oil and the automatic reset of the system. After vibration, the hydraulic oil in the second hydraulic chamber slowly flows back to the first hydraulic chamber through the return channel. At the same time, the rebound force of the connecting spring pulls the slide rod upward, and the entire system automatically returns to the initial state, preparing for the next molding operation. This reset function not only improves work efficiency but also reduces the workload of operators and lowers the complexity of operation.

[0023] Overall, this molding device for small precast components of dry-hard concrete, through its hydraulically driven vibration compaction mechanism, not only overcomes the technical bottlenecks of traditional molding equipment but also improves molding quality, increases production efficiency, reduces operating costs, and enhances the operating environment. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of a molding device for small precast dry concrete components according to the present invention.

[0025] Figure 2 This is a schematic diagram of the structure of the base and mounting bracket in this invention;

[0026] Figure 3 This is a schematic diagram of the mold box and the first vibration motor in this invention;

[0027] Figure 4 This is a schematic diagram of the sliding frame and the second vibration motor in this invention;

[0028] Figure 5 This is a schematic diagram of the sliding frame and the fixed cylinder in this invention;

[0029] Figure 6 This is a schematic diagram of the sliding frame in this invention;

[0030] Figure 7 This is a schematic diagram of the lifting plate and the second vibration motor in this invention;

[0031] Figure 8 In this invention Figure 7 A schematic diagram of the cross-sectional structure;

[0032] Figure 9 This is a cross-sectional view of the fixed cylinder and connecting pipe in this invention;

[0033] Figure 10 This is a cross-sectional view of the connecting pipe and sealing disc in this invention;

[0034] Figure 11 This is a cross-sectional view of the sliding tube and the fixed tube in this invention.

[0035] In the diagram: 11. Base; 12. Mounting bracket; 13. Top plate; 14. Guide rod; 15. First hydraulic cylinder; 16. Mold box; 17. Forming groove; 18. Spacing groove; 19. First vibration motor; 110. Second vibration motor; 21. Second hydraulic cylinder; 22. Sliding frame; 23. Limiting groove; 24. Lifting plate; 25. Limiting rod; 26. Pressure block; 27. Fixed cylinder; 28. First hydraulic chamber; 29. ​​Second hydraulic chamber; 31. Fixed pipe; 3 2. Threaded sleeve; 33. Slide tube; 34. Vibration spring; 35. Pull rod; 210. Connecting groove; 211. First connecting spring; 212. Slide rod; 213. Second connecting spring; 214. Suction spring; 215. Slide plate; 216. Push spring; 217. Push block; 218. Connecting tube; 219. Sealing disc; 220. Locking rod; 221. Compression spring; 222. Return groove; 223. Threaded rod; 224. Receiving plate; 225. Slide sleeve; 226. Locking groove. Detailed Implementation

[0036] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0037] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0038] In this invention, unless otherwise stated, the directional terms such as "up" and "down" generally refer to the directions shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" generally refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0039] Please see Figures 1 to 11A molding device for small precast component specimens of dry-hardened concrete includes a base 11, a mounting frame 12 on the upper surface of the base 11, a top plate 13 on the upper surface of the mounting frame 12, and four sets of guide rods 14 between the mounting frames 12; it also includes a molding mechanism, which includes second hydraulic cylinders 21. Two sets of second hydraulic cylinders 21 are provided on the upper surface of the top plate 13. The telescopic ends of the second hydraulic cylinders 21 are connected to sliding frames 22, which are slidably connected to the guide rods 14. Multiple sets of limiting grooves 23 are formed on the surface of the sliding frames 22, and four sets of lifting plates 24 are provided inside the sliding frames 22. Limiting rods 25 are provided at the four corners of the upper surface of the lifting plates 24, and the limiting rods 25 are slidably connected to the limiting grooves 23. Two sets of first hydraulic cylinders 15 are provided between 12. The telescopic ends of the first hydraulic cylinders 15 are connected to mold boxes 16. Mold boxes 16 are slidably connected to guide rods 14. Multiple sets of forming grooves 17 and spacer grooves 18 are opened in the mold boxes 16. Multiple sets of pressure blocks 26 adapted to the forming grooves 17 are provided on the lower end face of the sliding frame 22. A first vibration motor 19 is provided on the side wall of the mold box 16. A second vibration motor 110 is provided on the upper end face of the lifting plate 24. A fixed cylinder 27 is provided below the lifting plate 24. The fixed cylinder 27 is fixedly connected to the sliding frame 22. A first hydraulic cavity 28 is formed at the center of the fixed cylinder 27. Four sets of second hydraulic cavities 29 are formed around the first hydraulic cavity 28. The first hydraulic cavity 28 and the second hydraulic cavity 29 are connected to each other. The cavity 29 is connected via a connecting groove 210. A first connecting spring 211 is provided on the lower end face of the lifting plate 24. The other end of the first connecting spring 211 is connected to a slide rod 212, which is slidably connected to the first hydraulic cavity 28. A second connecting spring 213 is provided on the lower end face of the lifting plate 24, which is fixedly connected to the upper end face of the fixed cylinder 27. A suction spring 214 is provided inside the slide rod 212, and the other end of the suction spring 214 is connected to a sliding plate 215, which is slidably connected to the inner wall of the slide rod 212. A push spring 216 is provided inside the second hydraulic cavity 29. One end of the push spring 216 is fixedly connected to the top of the inner wall of the second hydraulic cavity 29, and the other end is connected to a push block 217, which is connected to the second hydraulic cavity. 29. Sliding connection: The bottom of the first hydraulic chamber 28 is fixedly connected to a connecting pipe 218, and the top of the connecting pipe 218 is sealed with a sealing disc 219. The lower end face of the sealing disc 219 is provided with four sets of clamping rods 220, and the lower end face of the clamping rods 220 is connected to a compression spring 221. A return groove 222 is opened at the center of the sealing disc 219. The lower end of the connecting pipe 218 is threadedly connected to a threaded rod 223. The upper end face of the threaded rod 223 is provided with a receiving plate 224. The other end of the compression spring 221 is fixedly connected to the upper end face of the receiving plate 224. The outer wall of the receiving plate 224 is provided with a sliding sleeve 225. The sliding sleeve 225 is slidably connected to the inner wall of the connecting pipe 218. The upper end face of the sliding sleeve 225 is provided with a groove 226 that matches the clamping rods 220.

[0040] It also includes a vibration mechanism, which includes a fixed pipe 31. Four sets of fixed pipes 31 are fixedly connected to the upper end face of the lifting plate 24. Threaded sleeves 32 are threadedly connected to the outer surface of the fixed pipes 31. A sliding pipe 33 is provided on the lower end face of the lifting plate 24. The upper end face of the sliding pipe 33 abuts against the lower end face of the lifting plate 24. A vibration spring 34 is provided on the lower end face of the fixed pipe 31. The other end of the vibration spring 34 is fixedly connected to the bottom of the inner side wall of the sliding pipe 33. A pull rod 35 is slidably connected inside the fixed pipe 31. The upper end face of the threaded sleeve 32 abuts against the side wall of the pull rod 35. The end of the pull rod 35 is fixedly connected to the vibration spring 34 inside the sliding pipe 33.

[0041] First, the first hydraulic cylinder 15 is activated. The telescopic end of the first hydraulic cylinder 15 pushes the mold box 16 down along the guide rod 14 until the lower end face of the mold box 16 is in close contact with the upper end face of the base 11. Then, concrete slurry is injected into the molding groove 17. The second hydraulic cylinder 21 is activated. The telescopic end of the second hydraulic cylinder 21 pushes the sliding frame 22 down along the guide rod 14 until the pressure block 26 below the sliding frame 22 is embedded in the molding groove 17 and squeezes the concrete slurry in the molding groove 17. The first vibration motor 19 and the second vibration motor 110 are activated. The first vibration motor 19 provides horizontal vibration, and the second vibration motor 110 provides vertical vibration.

[0042] Because the limiting rod 25 and the limiting groove 23 are slidably connected, when the second vibration motor 110 vibrates, the lifting plate 24 vibrates up and down accordingly. The area below the slide rod 212 in the first hydraulic chamber 28 and the area below the push block 217 in the second hydraulic chamber 29 are filled with hydraulic oil. During the vibration, when the lifting plate 24 vibrates downward, the vibration force is transmitted to the slide rod 212 through the first connecting spring 211. The slide rod 212 moves down, applying pressure to the first hydraulic chamber 28, reducing the volume of the first hydraulic chamber 28. The hydraulic oil in the first hydraulic chamber 28 impacts the sealing disc 219, causing the sealing disc 219 to move down and release the seal with the upper end of the connecting pipe 218. The hydraulic oil then passes through the sealing disc 219 and... Hydraulic oil flows into the connecting pipe 218 through the gap between the pipes 218. The locking rod 220 moves down synchronously with the sealing disc 219, compressing the spring 221. The hydraulic oil then flows down through the groove 226 on the surface of the sliding sleeve 225. Since the first hydraulic chamber 28 and the second hydraulic chamber 29 are connected by the connecting groove 210, the hydraulic oil below the second hydraulic chamber 29 is pressurized, pushing the push block 217 upward. The push spring 216 is compressed. When the locking rod 220 is engaged in the groove 226, the hydraulic oil stops flowing downward. When there is excess hydraulic oil that has not flowed down, it will push the sliding plate 215 upward, compressing the suction spring 214 and increasing the volume inside the first hydraulic chamber 28. When the lifting plate 24 vibrates upward, the sliding rod 212 moves accordingly. The upward movement releases the pressure of the slide rod 212 on the first hydraulic chamber 28, and the upper surface of the sealing disc 219 is no longer under force. The compression spring 221 rebounds and pushes the latch 220 and the sealing disc 219 upward until the sealing disc 219 re-seales with the upper surface of the connecting pipe 218. Therefore, after one up-and-down vibration, a small portion of the hydraulic oil in the first hydraulic chamber 28 flows into the second hydraulic chamber 29, causing the slide rod 212 to move downward. This downward movement of the slide rod 212 causes the lifting plate 24 and its lower end slide tube 33 to move downward as well. With continuous up-and-down vibration, the lifting plate 24, along with the slide tube 33, will continue to vibrate and move downward, pulling the first connecting spring 211 and the second connecting spring 213. The slide tube 33 is inserted into the lower forming groove 17 via the pressure block 26 to vibrate the concrete slurry in the forming groove 17. After vibration, the push spring 216 rebounds, pushing the push block 217 downward to apply pressure to the hydraulic oil in the second hydraulic chamber 29. The hydraulic oil slowly flows back to the first hydraulic chamber 28 through the return groove 222. At the same time, the first connecting spring 211 and the second connecting spring 213 also rebound to pull the slide rod 212 upward. Finally, after the concrete slurry has solidified, the first hydraulic cylinder 15 first drives the mold box 16 upward. Under the action of the pressure block 26, the solidified concrete is demolded. The second hydraulic cylinder 21 then moves upward and returns to the initial position to prepare for the next operation.

[0043] During vibration, the lifting plate 24 vibrates, causing the fixed pipe 31 connected above to vibrate synchronously. The fixed pipe 31 then causes the pull rod 35 to vibrate synchronously. The pull rod 35 drives the lower slide tube 33 to vibrate through the vibration spring 34. Compared with the rigid connection between the slide tube 33 and the lifting plate 24, the vibration spring 34 makes the vibration amplitude of the slide tube 33 larger. By adjusting the threaded sleeve 32, the pulling force of the pull rod 35 on the slide tube 33 can be adjusted. The greater the pulling force of the pull rod 35 on the slide tube 33, the more synchronous the vibration of the slide tube 33 and the pull rod 35. The hydraulic oil below the connecting pipe 218 is continuously flowing back through the return groove 222, but the return flow is less than the hydraulic oil squeezed down each time. By rotating the threaded rod 223, the position of the receiving plate 224 can be adjusted, thereby adjusting the distance between the slot 226 on the surface of the slide sleeve 225 and the locking rod 220, so as to control the amount of hydraulic oil flowing each time.

[0044] Of all the solutions mentioned above, those involving the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A molding device for small precast component specimens made of dry-hard concrete, comprising a base (11), characterized in that: The base (11) has a mounting bracket (12) on its upper surface, and a top plate (13) on its upper surface. Four sets of guide rods (14) are provided between the mounting brackets (12). The base also includes a forming mechanism, which includes a second hydraulic cylinder (21). Two sets of second hydraulic cylinders (21) are provided on the upper surface of the top plate (13). The telescopic ends of the second hydraulic cylinders (21) are connected to a sliding frame (22). The sliding frame (22) is slidably connected to the guide rods (14). The frame (22) has multiple sets of limiting grooves (23) on its surface. The sliding frame (22) is provided with four sets of lifting plates (24). The lifting plates (24) are provided with limiting rods (25) at the four corners of their upper surfaces. The limiting rods (25) are slidably connected to the limiting grooves (23). The frame (22) also includes a vibration mechanism. The vibration mechanism includes a fixed pipe (31). The lifting plates (24) are fixedly connected with four sets of fixed pipes (31). The outer surface of the fixed pipes (31) is threaded with a threaded sleeve (32).

2. The apparatus for molding small precast components of dry-hard concrete according to claim 1, characterized in that: Two sets of first hydraulic cylinders (15) are provided between the mounting brackets (12). The extension end of the first hydraulic cylinders (15) is connected to a mold box (16). The mold box (16) is slidably connected to the guide rod (14). Multiple sets of forming grooves (17) and interval grooves (18) are opened between the mold boxes (16). Multiple sets of pressure blocks (26) adapted to the forming grooves (17) are provided on the lower end face of the sliding frame (22).

3. The apparatus for molding small precast concrete components according to claim 2, characterized in that: The mold box (16) has a first vibration motor (19) on its side wall and a second vibration motor (110) on the upper surface of the lifting plate (24).

4. The apparatus for molding small precast component specimens of dry-hard concrete according to claim 3, characterized in that: A fixed cylinder (27) is provided below the lifting plate (24). The fixed cylinder (27) is fixedly connected to the sliding frame (22). A first hydraulic cavity (28) is formed in the center of the fixed cylinder (27). Four sets of second hydraulic cavities (29) are formed around the first hydraulic cavity (28). The first hydraulic cavity (28) and the second hydraulic cavity (29) are connected through a connecting groove (210).

5. The apparatus for molding small precast concrete components according to claim 4, characterized in that: The lower end face of the lifting plate (24) is provided with a first connecting spring (211), and the other end of the first connecting spring (211) is connected to a slide rod (212). The slide rod (212) is slidably connected to the first hydraulic chamber (28). The lower end face of the lifting plate (24) is provided with a second connecting spring (213), and the second connecting spring (213) is fixedly connected to the upper end face of the fixed cylinder (27).

6. The apparatus for molding small precast concrete components according to claim 5, characterized in that: The slide rod (212) is provided with a suction spring (214), and the other end of the suction spring (214) is connected to a slide plate (215). The slide plate (215) is slidably connected to the inner wall of the slide rod (212). The second hydraulic chamber (29) is provided with a push spring (216). One end of the push spring (216) is fixedly connected to the top of the inner wall of the second hydraulic chamber (29), and the other end is connected to a push block (217). The push block (217) is slidably connected to the second hydraulic chamber (29).

7. The apparatus for molding small precast concrete components according to claim 6, characterized in that: The bottom of the first hydraulic chamber (28) is fixedly connected to a connecting pipe (218), and the top of the connecting pipe (218) is sealed with a sealing disc (219). The lower end face of the sealing disc (219) is provided with four sets of clamping rods (220), and the lower end face of the clamping rods (220) is connected with a compression spring (221). A return groove (222) is opened at the center of the sealing disc (219).

8. The apparatus for molding small precast component specimens of dry-hard concrete according to claim 7, characterized in that: The lower end of the connecting tube (218) is threadedly connected to a threaded rod (223). The upper end of the threaded rod (223) is provided with a receiving plate (224). The other end of the compression spring (221) is fixedly connected to the upper end of the receiving plate (224). The outer wall of the receiving plate (224) is provided with a sliding sleeve (225). The sliding sleeve (225) is slidably connected to the inner wall of the connecting tube (218). The upper end of the sliding sleeve (225) is provided with a slot (226) that is compatible with the locking rod (220).

9. The apparatus for molding small precast concrete components according to claim 1, characterized in that: The lower end face of the lifting plate (24) is provided with a slide tube (33), the upper end face of the slide tube (33) abuts against the lower end face of the lifting plate (24), the lower end face of the fixed tube (31) is provided with a vibration spring (34), and the other end of the vibration spring (34) is fixedly connected to the bottom of the inner wall of the slide tube (33).

10. The apparatus for molding small precast component specimens of dry-hardened concrete according to claim 9, characterized in that: A pull rod (35) is slidably connected inside the fixed tube (31). The upper end face of the threaded sleeve (32) abuts against the side wall of the pull rod (35). The end of the pull rod (35) is fixedly connected to the vibration spring (34) inside the sliding tube (33).

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