Hydraulic system of brick press and control method
By introducing reciprocating components and a buffer structure into the hydraulic brick press, the problems of high energy consumption and easy cracking during demolding of the downward-pressing hydraulic brick press have been solved, achieving more efficient energy utilization and improved brick forming quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-11
- Publication Date
- 2026-04-03
AI Technical Summary
Existing hydraulic brick presses consume a lot of energy and have short hydraulic cylinder life when pressing bricks repeatedly, and the brick blanks are prone to cracking during demolding.
The hydraulic system, which combines hydraulic cylinders and reciprocating components, reduces the lifting frequency of the upper mold during multiple brick pressing actions through the secondary pressure ring and sliding sleeve structure in the reciprocating components, and provides buffering during demolding. The flow of oil is controlled by springs and reversing valves to achieve uniform pressing and buffered demolding.
This reduces the energy consumption of the hydraulic system, extends the service life of the hydraulic cylinder, and reduces the risk of cracking of the brick blank during demolding.
Smart Images
Figure CN121782231A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of hydraulic system technology, and specifically to a hydraulic system and control method for a brick press. Background Technology
[0002] Currently, hydraulic brick presses are mainly down-press hydraulic brick presses. In order to make the pressed bricks more compact, existing down-press hydraulic pressing machines usually use an oil pump to drive the entire upper mold to move up and down repeatedly to achieve multiple pressing actions, thereby making the pressed brick blanks highly dense.
[0003] However, the upper mold is usually of high quality, and the hydraulic press drives the entire upper mold to move up and down in a reciprocating motion, which consumes a lot of energy. At the same time, the oil in the hydraulic cylinder moves more frequently, generating more heat and reducing the service life of the hydraulic cylinder. Moreover, when demolding the bricks after pressing, the initial demolding speed is fast, and the lack of a buffer device can easily cause the brick blank to crack. Summary of the Invention
[0004] This invention provides a hydraulic system for a brick press, which aims to improve the high energy consumption problem of multiple pressing actions in existing hydraulic brick presses.
[0005] The technical solution of the present invention is as follows: a hydraulic system for a brick press includes a hydraulic cylinder, the hydraulic cylinder including a hydraulic cylinder body and a main pressure rod, an upper mold is fixedly connected to the bottom of the main pressure rod, a connecting sleeve is fixedly connected to the main pressure rod, the connecting sleeve is slidably connected to the hydraulic cylinder body, and a reciprocating component is connected to the connecting sleeve;
[0006] The reciprocating assembly includes a fixed spring ring and a secondary pressure ring. The secondary pressure ring has an oil inlet cavity, and a fixed draining device is provided on the outside of the secondary pressure ring. The secondary pressure ring is slidably connected to the fixed draining device. The fixed draining device has an upper secondary oil space and a lower secondary oil space, and only one of the upper secondary oil space and the lower secondary oil space is connected to the secondary oil cavity at any given time.
[0007] The fixed draining component is provided with a fixed sleeve on its outer side, and the fixed sleeve is sealed to the secondary pressure ring. The fixed draining component is provided with a sliding sleeve on its outer side, and the sliding sleeve slides relative to the fixed sleeve. The sliding sleeve is provided with two draining channels, and only one of the two draining channels is connected to the external oil outlet at any given time.
[0008] Furthermore, the fixed spring ring is provided with a spring space, in which a plurality of springs are fixed, for controlling the reciprocating extension and retraction of the secondary pressure ring.
[0009] Furthermore, a lower oil space is formed between the bottom of the main pressure rod and the body of the hydraulic cylinder, a buffer space is provided between the body of the hydraulic cylinder and the connecting sleeve, an oil inlet is provided between the lower oil space and the outside, and a reversing valve is provided between the buffer space, the lower oil space, and the oil inlet. The reversing valve is used to control the connection between the buffer space and the outside and the lower oil space.
[0010] Furthermore, an upper oil space is formed between the top of the main pressure rod and the main body of the hydraulic cylinder. The upper oil space is connected to the outside by an inlet and outlet oil pipe. A safety valve is provided between the upper oil space and the outside. The upper oil space and the buffer space are connected to each other after the main pressure rod moves to the bottom.
[0011] Furthermore, the reciprocating assembly includes a control fixing member, which is used to control the up-and-down movement of the sliding sleeve.
[0012] Furthermore, the main pressure rod is provided with a slidable connection to the main pressure rod.
[0013] Another objective of this invention is to provide a control method for the hydraulic system of a brick press, the specific steps of which are as follows:
[0014] S1: The oil pump is used to pump oil into the upper oil space through the inlet and outlet oil pipes. The main pressure rod is controlled to move downward to the bottom. The oil in the lower oil space enters the buffer space. The upper oil space is connected to the buffer space, so that the upper mold can squeeze the blank downward.
[0015] S2: The oil pump continues to pump oil into the upper oil space. The oil enters the spring space through the reversing valve and flows into the secondary upper oil space. The hydraulic pressure increases continuously and squeezes the secondary pressure ring downward, so that the secondary pressure ring contacts the top of the upper mold and simultaneously squeezes the upper mold downward.
[0016] S3: The secondary pressure ring moves downward continuously while the sliding sleeve moves upward until the secondary oil chamber is connected to the outside through the secondary lower oil space. At this time, the oil pump stops pumping oil into the upper oil space, and the secondary oil chamber is depressurized and moves upward under the action of the spring.
[0017] S4: After the auxiliary oil chamber is depressurized and reset, the oil pump is controlled to continue pumping oil into the upper oil space to realize the reciprocating motion of the auxiliary oil chamber;
[0018] S5: After the brick pressing is completed, stop the oil pump from pumping oil into the upper oil space, adjust the reversing valve to connect the lower oil space with the outside, pump oil into the oil inlet to make the main pressure rod move upward, and at the same time, the oil in the buffer space flows through the auxiliary oil chamber to be discharged to the outside.
[0019] The working principle and beneficial effects of this invention are as follows: This invention not only utilizes an annular auxiliary pressure rod that can reciprocate to add to the hydraulic cylinder, so that subsequent pressing actions do not require lifting the entire upper mold, but also applies a more uniform force to the upper mold, and provides a buffer during demolding, which can greatly reduce the cracking of the blank caused by demolding. Attached Figure Description
[0020] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.
[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;
[0022] Figure 2 This is a schematic diagram of the overall main structure of the present invention;
[0023] Figure 3 for Figure 2 BB section view;
[0024] Figure 4 This is a half-sectional view of the present invention and the upper mold;
[0025] Figure 5 This is a schematic diagram of the overall structure of the fixed drainage component in this invention;
[0026] Figure 6 This is a schematic diagram of the overall structure of the fixed spring ring in this invention.
[0027] In the diagram: 1. Hydraulic cylinder body; 2. Main pressure rod; 3. Secondary pressure ring; 4. Fixed spring ring; 5. Cover plate; 6. Fixed draining component; 7. Connecting sleeve; 8. Sliding sleeve; 9. Stop; 10. Fixed sleeve; 11. Spring space; 12. Reversing valve; 13. Inlet and outlet oil pipes; 14. Safety valve; 15. Sealing ring; 16. Buffer space; 17. Lower oil space; 18. Upper oil space; 19. Control fixing component; 20. Secondary oil chamber; 21. Secondary upper oil space; 22. Secondary lower oil space; 23. Oil inlet; 24. Upper mold. Detailed Implementation
[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.
[0029] Depend on Figures 1-4As shown, in this embodiment, a hydraulic system for a brick press includes a hydraulic cylinder. The hydraulic cylinder includes a hydraulic cylinder body 1 and a main pressure rod 2. An upper mold 24 is fixedly connected to the bottom of the main pressure rod 2. A connecting sleeve 7 is fixedly connected to the main pressure rod 2. The connecting sleeve 7 is slidably connected to the hydraulic cylinder body 1. A reciprocating assembly is provided on the connecting sleeve 7. The reciprocating assembly includes a fixed spring ring 4 and a secondary pressure ring 3. The secondary pressure ring 3 has a cavity for oil inlet, a secondary oil chamber 20. A fixed guide 6 is provided on the outside of the secondary pressure ring 3. The secondary pressure ring 3 is slidably connected to the fixed guide 6. The fixed guide 6 has an upper secondary oil space 21 and a lower secondary oil space 22. Only one of the upper secondary oil space 21 and the lower secondary oil space 22 is connected to the secondary oil chamber 20 at any given time. Figure 5 As shown, the auxiliary pressure ring 3 and the fixed drainage component 6 can be either ring-shaped or rectangular, corresponding to the upper mold 24, so that pressure can be applied to all four sides of the upper mold 24, making the brick blanks pressed in one press more uniform.
[0030] A fixed sleeve 10 is provided on the outside of the fixed drainage component 6. The fixed sleeve 10 is sealed to the auxiliary pressure ring 3. A sliding sleeve 8 is provided on the outside of the fixed drainage component 6. The sliding sleeve 8 can slide up and down relative to the fixed sleeve 10. The sliding sleeve 8 has two drainage channels, upper and lower, and only one of the two drainage channels is connected to the external oil outlet at any given time. When the sliding sleeve 8 is at the bottom, neither of the two drainage channels is connected to the cavity in the fixed drainage component 6. During the upward sliding of the sliding sleeve 8, the oil in the cavity of the fixed drainage component 6 flows into the two drainage channels. The hydraulic pressure in the upper auxiliary oil space 21 and the lower auxiliary oil space 22 is reduced, and the sliding sleeve 8 continues to slide upward. The lower drain channel is connected to the oil outlet, and the high-pressure oil in the lower drain channel is discharged. When the sliding sleeve 8 slides to the top, the upper drain channel is connected to the upper auxiliary oil space 21. During the downward sliding process of the sliding sleeve 8, the connection between the upper drain channel and the upper auxiliary oil space 21 is gradually disconnected and connected to the oil outlet, and the high-pressure oil in the upper drain channel is discharged. This achieves pressure relief of the cavity auxiliary oil chamber 20, so that the auxiliary pressure ring 3 can be reset.
[0031] like Figure 6 As shown, the fixed spring ring 4 is provided with a spring space 11, in which several springs are fixed, or other elastic devices, to adjust the reciprocating extension and retraction of the secondary pressure ring 3. The fixed spring ring 4 can be a ring structure and is connected to the connecting sleeve 7 by a thread.
[0032] A lower oil space 17 is formed between the bottom of the main pressure rod 2 and the hydraulic cylinder body 1. A buffer space 16 is provided between the hydraulic cylinder body 1 and the connecting sleeve 7. An oil inlet 23 is provided between the lower oil space 17 and the outside. A reversing valve 12 is provided between the buffer space 16, the lower oil space 17, and the oil inlet 23. The reversing valve 12 is used to control the connection between the buffer space 16 and the outside and the lower oil space 17.
[0033] like Figure 4 As shown, a cover plate 5 is fixedly installed at the bottom of the connecting sleeve 7 to restrict and fix the fixed guide 6, the fixed sleeve 10 and the stop 9, and to protect the circulation assembly from bumps and contamination. At the same time, it can be fixedly connected to the upper mold 24 to increase stability.
[0034] An upper oil space 18 is formed between the top of the main pressure rod 2 and the hydraulic cylinder body 1. The upper oil space 18 is connected to the outside world by an inlet and outlet oil pipe 13, which can pump oil from the outside into the upper oil space 18. A safety valve 14 is provided between the upper oil space 18 and the outside world. The upper oil space 18 and the buffer space 16 are connected to each other after the main pressure rod 2 moves to the bottom. The reciprocating assembly includes a control fixing component 19, which is used to control the up and down movement of the sliding sleeve 8.
[0035] like Figure 4 As shown, a hydraulic system for a brick press includes a hydraulic cylinder. An oil pump pumps oil through the inlet and outlet oil pipes 13, causing the main pressure rod 2 to move and compress the brick blank. During the process, controlling the start and stop of the oil pump pumping oil through the inlet and outlet oil pipes 13 allows the secondary pressure ring 3 to continuously move up and down, applying force to the upper mold 24, making the brick blank more evenly and densely pressed. The oil pumped out by the reciprocating motion flows back to the oil tank through the oil outlet of the baffle 9. Finally, the reversing valve 12 is adjusted, and oil is pumped into the lower oil space 17 through the oil inlet 23, controlling the main pressure rod 2 to reset.
[0036] A control method for the hydraulic system of a brick press proposed in the above embodiments includes the following control steps:
[0037] S1: The oil pump is used to pump oil into the upper oil space 18 through the inlet and outlet oil pipes 13. The main pressure rod 2 is controlled to move downward to the bottom. The oil in the lower oil space 17 enters the buffer space 16. The upper oil space 18 is connected to the buffer space 16, so that the upper mold 24 can squeeze the blank downward.
[0038] S2: The oil pump continues to pump oil into the upward oil space 18. The oil enters the spring space 11 through the reversing valve 12 and flows into the auxiliary upper oil space 21. The hydraulic pressure continuously increases and squeezes the auxiliary pressure ring 3 to move downward, so that the auxiliary pressure ring 3 contacts the top of the upper mold 24, and at the same time squeezes the upper mold 24 downward.
[0039] S3: The secondary pressure ring 3 moves downward continuously, while the sliding sleeve 8 moves upward until the secondary oil chamber 20 is connected to the outside through the secondary lower oil space 22. At this time, the oil pump stops pumping oil into the upper oil space 18, and the secondary oil chamber 20 is depressurized and moves upward under the action of the spring.
[0040] S4: After the auxiliary oil chamber 20 is depressurized and reset, the oil pump is controlled to continue pumping oil into the upward oil space 18 to realize the reciprocating motion of the auxiliary oil chamber 20.
[0041] S5: After the brick pressing is completed, stop the oil pump from pumping oil into the upper oil space 18, adjust the reversing valve 12 to connect the lower oil space 17 with the outside, pump oil into the oil inlet 23 to make the main pressure rod 2 move upward, and at the same time, the oil in the buffer space 16 flows to the auxiliary oil chamber 20 to be discharged to the outside.
[0042] It should be noted that the oil pump pumps oil into the upper oil space 18 through the inlet and outlet oil pipes 13, controlling the main pressure rod 2 to move downward to the bottom. The auxiliary oil chamber 20 is connected to the auxiliary upper oil space 21. The oil outlet in the baffle 9 is not connected to the auxiliary upper oil space 21 or the auxiliary lower oil space 22. At this time, the oil pump continues to pump oil, increasing the pressure in the auxiliary upper oil space 21. The auxiliary pressure ring 3 moves downward. During the downward movement of the auxiliary pressure ring 3, the sliding sleeve 8 is controlled upward by the control fixing part 19. As the process continues, the connection between the auxiliary oil chamber 20 and the upper auxiliary oil space 21 gradually narrows until they separate. After separation, the auxiliary oil chamber 20 connects to the lower auxiliary oil space 22. At this point, the lower auxiliary oil space 22 connects to the drainage channel of the sliding sleeve 8, but is still not connected to the oil outlet of the stop 9. Oil continues to be pumped in, causing the auxiliary pressure ring 3 to press down on the upper mold 24 and the sliding sleeve 8 to move upwards until the auxiliary oil chamber 20 and the lower auxiliary oil space 22 are no longer connected, and until the sliding sleeve 8 and the lower auxiliary oil space... The oil outlets of chamber 22 and stop 9 are connected, and some oil is discharged. At this time, the oil pumping stops, and the pressure on the upper mold 24 is released. The secondary pressure ring 3 moves upward a certain distance under the force of the spring, and then the sliding sleeve 8 moves downward, so that the secondary lower oil space 22 is not connected to the outside. The secondary oil chamber 20 is connected to the secondary lower oil space 22, and the oil enters the secondary lower oil space 22 with lower hydraulic pressure. The secondary pressure ring 3 continues to slide upward, and the secondary oil chamber 20 is connected to the secondary upper oil space 21, and the oil enters again. When the hydraulic pressure is lowered, the oil pump operates and pressurizes the secondary oil chamber 20 again, causing the secondary pressure ring 3 to move downward. This allows the secondary pressure ring 3 to continuously reciprocate and squeeze the upper mold 24. After the brick is pressed, during the upward movement of the main pressure rod 2, the oil in the buffer space 16 flows into the secondary oil chamber 20, increasing the pressure inside the secondary oil chamber 20. This keeps the secondary pressure ring 3 pressing against the upper mold 24, acting as a buffer and preventing the brick blank from cracking due to excessive demolding speed.
[0043] Example 2
[0044] Based on the same concept as in Embodiment 1 above, in this embodiment, the adjustable reversing valve 12 can be adjusted so that the lower oil space 17 is only connected to the oil inlet 23 and not connected to the buffer space 16, thereby stopping the up-and-down reciprocating motion of the secondary pressure ring 3, realizing manual control of the start and stop of the up-and-down reciprocating motion of the reciprocating component, reducing losses and saving energy when multiple pressing actions are not required.
[0045] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. 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 hydraulic system for a brick press, comprising a hydraulic cylinder, the hydraulic cylinder including a hydraulic cylinder body (1) and a main pressure rod (2), wherein an upper mold (24) is fixedly connected to the bottom of the main pressure rod (2), characterized in that, The main pressure rod (2) is fixedly connected to a connecting sleeve (7), the connecting sleeve (7) is slidably connected to the hydraulic cylinder body (1), and the connecting sleeve (7) is provided with a reciprocating component; The reciprocating assembly includes a fixed spring ring (4) and a secondary pressure ring (3). The secondary pressure ring (3) has an oil-filled cavity secondary oil chamber (20). A fixed draining member (6) is provided on the outside of the secondary pressure ring (3). The secondary pressure ring (3) is slidably connected to the fixed draining member (6). The fixed draining member (6) has an upper secondary oil space (21) and a lower secondary oil space (22). Only one of the upper secondary oil space (21) and the lower secondary oil space (22) is connected to the secondary oil chamber (20). The fixed draining component (6) is provided with a fixed sleeve (10) on the outside. The fixed sleeve (10) is sealed to the secondary pressure ring (3). The fixed draining component (6) is provided with a sliding sleeve (8) on the outside. The sliding sleeve (8) slides relative to the fixed sleeve (10). The sliding sleeve (8) is provided with two draining channels, and only one of the two draining channels is connected to the external oil outlet at the same time.
2. The hydraulic system for a brick press according to claim 1, characterized in that, The fixed spring ring (4) is provided with a spring space (11), and a number of springs are fixed in the spring space (11) to control the reciprocating extension and retraction of the secondary pressure ring (3).
3. The hydraulic system for a brick press according to claim 1, characterized in that, A lower oil space (17) is formed between the bottom of the main pressure rod (2) and the hydraulic cylinder body (1). A buffer space (16) is provided between the hydraulic cylinder body (1) and the connecting sleeve (7). An oil inlet (23) is provided between the lower oil space (17) and the outside. A reversing valve (12) is provided between the buffer space (16), the lower oil space (17), and the oil inlet (23). The reversing valve (12) is used to control the connection between the buffer space (16) and the outside and the lower oil space (17).
4. The hydraulic system for a brick press according to claim 3, characterized in that, An upper oil space (18) is formed between the top of the main pressure rod (2) and the main body (1) of the hydraulic cylinder. The upper oil space (18) is connected to the outside by an inlet and outlet oil pipe (13). A safety valve (14) is provided between the upper oil space (18) and the outside. The upper oil space (18) and the buffer space (16) are connected to each other after the main pressure rod (2) moves to the bottom.
5. The hydraulic system for a brick press according to claim 1, characterized in that, The reciprocating assembly includes a control fixing member (19) for controlling the up-and-down movement of the sliding sleeve (8).
6. The hydraulic system for a brick press according to claim 1, characterized in that, The bottom of the connecting sleeve (7) is provided with a cover plate (5) to protect the circulation component from bumps and contamination. The cover plate (5) can be fixed to the upper mold (24).
7. The control method for the hydraulic system of a brick press as described in claim 6, wherein the control steps are as follows: S1: The oil pump is used to pump oil into the upper oil space (18) through the oil inlet and outlet pipes (13), and the main pressure rod (2) is controlled to move downward to the bottom. The oil in the lower oil space (17) enters the buffer space (16). The upper oil space (18) is connected to the buffer space (16), so that the upper mold (24) can squeeze the blank downward. S2: The oil pump continues to pump oil into the upper oil space (18). The oil enters the spring space (11) through the reversing valve (12) and flows into the secondary upper oil space (21). The hydraulic pressure increases continuously and squeezes the secondary pressure ring (3) to move downward, so that the secondary pressure ring (3) contacts the top of the upper mold (24) and squeezes the upper mold (24) downward at the same time. S3: The secondary pressure ring (3) moves downward continuously, while the sliding sleeve (8) moves upward until the secondary oil chamber (20) is connected to the outside through the secondary lower oil space (22). At this time, the oil pump stops pumping oil into the upper oil space (18), and the secondary oil chamber (20) is depressurized and moves upward under the action of the spring. S4: After the auxiliary oil chamber (20) is depressurized and reset, the oil pump is controlled to continue pumping oil into the upper oil space (18) to realize the reciprocating motion of the auxiliary oil chamber (20); S5: After the brick pressing is completed, stop the oil pump to pump oil into the upper oil space (18), adjust the reversing valve (12) to connect the lower oil space (17) with the outside, pump oil into the oil inlet (23) to make the main pressure rod (2) move upward, and at the same time, the oil in the buffer space (16) flows through the auxiliary oil chamber (20) to be discharged to the outside.