Lifting buffer device for forward car door frame

Abstract

The utility model relates to a lifting buffer device for a forward car frame. The technical problems that after an existing portal frame is lifted in place, an oil cylinder can make strong metal impact sound, and the shaking amplitude of the portal frame is large are solved. Comprising a middle oil cylinder arranged between an inner door frame and a fork piece connecting base, the middle oil cylinder comprises a cylinder body and a piston rod, a piston part is arranged at one end of the piston rod, one end of the piston rod is connected with the fork piece connecting base, the lower end of the cylinder body is connected with the inner door frame, and a rod cavity is formed between the piston rod and the cylinder body; a buffering oil cavity is formed in the piston rod, and a lifting buffering structure is arranged between the piston rod and the piston part. The middle oil cylinder has the advantages that through the design structure of the piston rod and the piston part, the rod body channel and the piston channel are utilized, after the piston rod is lifted in place, rod cavity oil in the rod cavity enters the buffering oil cavity of the piston rod, a certain buffering effect is achieved, and the impact sound generated when the middle oil cylinder is lifted in place is reduced.

Description

Technical Field

[0001] This utility model belongs to the technical field of hydraulic cylinder equipment, specifically relating to a forward-moving mast lifting buffer device. Background Technology

[0002] Reach trucks are widely used in logistics and warehousing. Their masts require frequent lifting operations, and to ensure efficient cargo handling and operator safety, the mast must be able to lift and lower smoothly. A typical mast consists of three levels: an outer mast, a middle mast, and an inner mast. These masts are connected sequentially by side cylinders for lifting and lowering. The forks are connected to the inner mast via a middle cylinder, which controls the lifting and lowering of the forks. However, in current technology, when the forks are fully raised, the impact is only mitigated by the elasticity of the rubber pads, resulting in limited cushioning. This leads to a loud metallic clanging sound from the cylinders after lifting and significant mast swaying, potentially damaging the mast structure and seriously compromising safety. Summary of the Invention

[0003] The purpose of this invention is to address the above-mentioned problems by providing a forward-moving door frame lifting buffer device.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a forward-moving mast lifting and buffering device, comprising an intermediate hydraulic cylinder disposed between the inner mast and the fork connecting seat, the intermediate hydraulic cylinder comprising a cylinder body and a piston rod movably disposed within the cylinder body, one end of the piston rod having a piston portion located within the cylinder body, the end of the piston rod away from the piston portion being connected to the fork connecting seat, the lower end of the cylinder body being connected to the inner mast, a rod chamber being provided between the piston rod and the cylinder body, a rodless chamber being provided at the end of the piston portion away from the piston rod, and the rodless chamber being connected to a hydraulic port at one end of the cylinder body, a buffer oil chamber being provided within the piston rod, and a lifting and buffering structure being provided between the piston rod and the piston portion, which allows the rod chamber oil in the rod chamber to enter the buffer oil chamber when the piston portion moves to the end of the cylinder body away from the hydraulic port. When the piston rod is about to rise to the top, the oil in the rod chamber flows into the buffer oil chamber through the lifting buffer structure, which offsets part of the inertial force brought by the oil in the rodless chamber, achieving smooth buffering, avoiding collision between the piston and the cylinder, and extending the service life of the intermediate cylinder.

[0005] In the aforementioned forward-moving mast lifting and buffer device, the piston portion has a rod connecting portion near the piston rod end, and the piston rod has a piston connecting groove corresponding to the rod connecting portion on its inner side near the piston portion end. A piston wire retaining ring is provided on the outer circumferential side of the rod connecting portion, contacting the inner side of the piston rod. The piston wire retaining ring ensures the oil in the buffer chamber is sealed, preventing leakage and thus affecting the buffering effect.

[0006] In the aforementioned forward-moving mast lifting buffer device, a piston support ring is provided circumferentially outward at the end of the piston portion away from the rod connection portion. An SPGO-type Glyd ring is provided on one side of the piston support ring. Both the outer side of the SPGO-type Glyd ring and the outer side of the piston support ring are in contact with the inner side of the cylinder body. The SPGO-type Glyd ring is a hydraulic seal used for sealing reciprocating pistons. It features low friction, high wear resistance, and chemical resistance. Composed of a wear-resistant ring and an elastic rubber O-ring, the SPGO-type Glyd ring reduces motion resistance, improves efficiency, extends service life, and is adaptable to both high and low temperature environments.

[0007] In the aforementioned forward-moving mast lifting and buffering device, the lifting and buffering structure includes a rod channel disposed at one end of the piston rod near the piston connecting groove and radially extending into the piston connecting groove. A piston channel corresponding to the rod channel is provided on the inner side of the rod connecting part. The piston channel has an L-shaped structure, with one end corresponding to the rod channel and the other end axially extending to the outer side of the rod connecting part. A lifting and buffering assembly is provided on the circumferential inner side of the piston part. Oil in the rod chamber enters the buffer oil chamber through the rod channel and piston channel, significantly increasing the oil flow resistance and thus ensuring the stable operation of the intermediate cylinder.

[0008] In the aforementioned forward-moving mast lifting and buffering device, the lifting and buffering assembly includes a valve body mounting groove disposed on the inner side of the piston section near the rodless chamber. A one-way valve is installed within the valve body mounting groove. An axially penetrating oil return channel is provided at the end of the valve body mounting groove near the rod connection portion. The valve body mounting groove is connected to the piston connection groove via the oil return channel, and the end of the valve body mounting groove away from the oil return channel is connected to the rodless chamber via a retaining ring mounting groove. Under certain conditions, the oil in the buffer oil chamber flows back to the rodless chamber through the one-way valve.

[0009] In the aforementioned forward-moving mast lifting buffer device, the diameter of the retaining ring mounting groove is larger than the diameter of the valve body mounting groove, the diameter of the valve body mounting groove is larger than the diameter of the oil return channel, a piston baffle is provided on the inner side of the retaining ring mounting groove near the valve body mounting groove, and a perforated elastic retaining ring is provided on one side of the piston baffle.

[0010] In the aforementioned forward-moving mast lifting buffer device, the buffer oil chamber is located inside the piston rod near the piston connecting groove, the buffer oil chamber is connected to the piston connecting groove, the rod channel is connected to the rod chamber at the end away from the piston channel, and the piston channel is connected to the piston connecting groove at the end away from the rod channel.

[0011] In the aforementioned forward-moving mast lifting buffer device, a guide sleeve is provided on the inner side of the cylinder body away from the hydraulic oil port. The guide sleeve is located between the cylinder body and the piston rod. An oil filling port is provided on the cylinder body near the guide sleeve, and the oil filling port is connected to the rod chamber.

[0012] In the aforementioned forward-moving mast lifting buffer device, a dustproof ring is provided on the inner side of the guide sleeve away from the oil filler port. An inner baffle is provided on one side of the dustproof ring, and a shaft seal is provided on one side of the inner baffle. The dustproof ring, the inner baffle, and the shaft seal all contact the outer side of the piston rod. The dustproof ring prevents external dust, moisture, and other contaminants from entering the cylinder, avoiding problems such as oil contamination leading to jamming and damage. It also prevents oil leakage into the external environment, reducing the risk of contamination.

[0013] In the aforementioned forward-moving mast lifting buffer device, a first sealing ring is provided on the outer side of the guide sleeve near the oil filler port. An outer baffle plate is provided on one side of the first sealing ring, and a second sealing ring is provided on the outer side of the middle portion of the guide sleeve. All three sealing rings—the first, second, and shaft sealing rings—are in contact with the inner side of the cylinder body. The first, second, and shaft sealing rings ensure that the oil in the rod chamber is discharged only through the internal channel of the intermediate cylinder, preventing leakage to the outside.

[0014] Compared with existing technologies, the advantages of this utility model are:

[0015] This device, through the design structure of the piston rod and piston section, utilizes the rod channel and piston channel. When the piston rod is raised to its position, the oil in the rod chamber enters the buffer oil chamber of the piston rod, which plays a certain buffering role, reduces the impact noise when the intermediate cylinder is raised to its position, and thus ensures the stable operation of the whole. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 This is a structural cross-sectional view of the present invention.

[0018] Figure 3 This is the utility model Figure 2 Enlarged view of the structure at point A in the middle.

[0019] Figure 4 This is a cross-sectional view of the piston section in this utility model.

[0020] In the diagram: 1. Intermediate cylinder; 2. Cylinder body; 21. Rod chamber; 22. Rodless chamber; 23. Hydraulic port; 24. Filler port; 3. Piston rod; 3. Buffer oil chamber; 32. Piston connecting groove; 4. Piston part; 41. Rod body connecting part; 42. Piston wire retaining ring; 43. Piston support ring; 44. SPGO type Glyd ring; 5. Lifting buffer structure; 51. Rod body channel; 52. Piston channel; 6. Lifting buffer assembly; 61. Valve body mounting groove; 62. Check valve; 63. Return oil channel; 64. Retaining ring mounting groove; 65. Piston retaining plate; 66. Hole elastic retaining ring; 7. Guide sleeve; 71. Dustproof ring; 72. Inner retaining plate of guide sleeve; 73. Shaft sealing ring; 74. First sealing ring; 75. Outer retaining plate of guide sleeve; 76. Second sealing ring. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0022] like Figure 1-4 As shown, a forward-moving mast lifting and buffering device includes an intermediate hydraulic cylinder 1 disposed between the inner mast and the fork connecting seat. The intermediate hydraulic cylinder 1 includes a cylinder body 2 and a piston rod 3 movably disposed within the cylinder body 2. One end of the piston rod 3 is provided with a piston portion 4 located within the cylinder body 2. The end of the piston rod 3 away from the piston portion 4 is connected to the fork connecting seat. The lower end of the cylinder body 2 is connected to the inner mast. A rod chamber 21 is provided between the piston rod 3 and the cylinder body 2. The end of the piston portion 4 away from the piston rod 3 has a rodless chamber 22, and the rodless chamber 22 is connected to a hydraulic port 23 at one end of the cylinder body 2. A buffer oil chamber 31 is provided within the piston rod 3. A lifting and buffering structure 5 is provided between the piston rod 3 and the piston portion 4, which allows the rod chamber oil in the rod chamber 21 to enter the buffer oil chamber 31 when the piston portion 4 moves to the end of the cylinder body 2 away from the hydraulic port 23. When the piston rod 3 is about to rise to the top, the oil in the rod chamber 21 flows into the buffer oil chamber 31 through the lifting buffer structure 5, which offsets part of the inertial force brought by the oil in the rodless chamber 22, achieving smooth buffering, avoiding collision between the piston part 4 and the cylinder 2, and extending the service life of the intermediate cylinder 1.

[0023] like Figure 2 As shown, the piston part 4 has a rod connecting part 41 near the piston rod 3. The piston rod 3 has a piston connecting groove 32 corresponding to the rod connecting part 41 on its inner side near the piston part 4. The rod connecting part 41 has a piston wire retaining ring 42 that contacts the inner side of the piston rod 3 on its outer circumference. The piston wire retaining ring 42 can ensure the sealing of the oil in the buffer oil chamber 31 and prevent leakage, thereby affecting the buffering effect.

[0024] like Figure 3As shown, a piston support ring 43 is provided circumferentially outward at the end of the piston section 4 away from the rod connection section 41. An SPGO type Glyd ring 44 is provided on one side of the piston support ring 43. Both the outer side of the SPGO type Glyd ring 44 and the outer side of the piston support ring 43 are in contact with the inner side of the cylinder body 2. The SPGO type Glyd ring 44 is a hydraulic seal used for sealing reciprocating pistons. It has low friction, high wear resistance, and chemical resistance. The SPGO type Glyd ring 44 is composed of a wear-resistant ring and an elastic rubber O-ring, which can reduce motion resistance, improve efficiency, extend service life, and adapt to high and low temperature environments.

[0025] Combination Figure 2 and Figure 3 As shown, the lifting buffer structure 5 includes a rod channel 51 disposed at one end of the piston rod 3 near the piston connecting groove 32 and radially extending into the piston connecting groove 32. A piston channel 52 corresponding to the rod channel 51 is provided inside the rod connecting part 41. The piston channel 52 has an L-shaped structure, with one end corresponding to the rod channel 51 and the other end axially extending to the outside of the rod connecting part 41. A lifting buffer assembly 6 is provided around the piston part 4 inwards. Oil in the rod chamber 21 enters the buffer oil chamber 31 through the rod channel 51 and piston channel 52, significantly increasing the oil flow resistance and thus ensuring the stable operation of the intermediate cylinder 1.

[0026] Combination Figure 3 and Figure 4 As shown, the lifting buffer assembly 6 includes a valve body mounting groove 61 located inside the piston section 4 near the rodless chamber 22. A one-way valve 62 is installed within the valve body mounting groove 61. An axially penetrating oil return channel 63 is provided at the end of the valve body mounting groove 61 near the rod connection section 41. The valve body mounting groove 61 is connected to the piston connection groove 32 via the oil return channel 63, and the end of the valve body mounting groove 61 away from the oil return channel 63 is connected to the rodless chamber 22 via a retaining ring mounting groove 64. Under certain conditions, the oil in the buffer oil chamber 31 flows back to the rodless chamber 22 through the one-way valve 62.

[0027] Among them, the diameter of the retaining ring mounting groove 64 is larger than the diameter of the valve body mounting groove 61, the diameter of the valve body mounting groove 61 is larger than the diameter of the oil return channel 63, a piston baffle 65 is provided on the inner side of the end of the retaining ring mounting groove 64 near the valve body mounting groove 61, and a perforated elastic retaining ring 66 is provided on one side of the piston baffle 65.

[0028] Specifically, the buffer oil chamber 31 is located on the inner side of the piston rod 3 near the piston connecting groove 32. The buffer oil chamber 31 is connected to the piston connecting groove 32. The end of the rod channel 51 away from the piston channel 52 is connected to the rod chamber 21. The end of the piston channel 52 away from the rod channel 51 is connected to the piston connecting groove 32.

[0029] like Figure 2As shown, a guide sleeve 7 is provided on the inner side of the cylinder body 2 away from the hydraulic oil port 23. The guide sleeve 7 is located between the cylinder body 2 and the piston rod 3. An oil filling port 24 is provided on the cylinder body 2 near the guide sleeve 7, and the oil filling port 24 is connected to the rod chamber 21.

[0030] The guide sleeve 7 has a dustproof ring 71 on its inner side at the end furthest from the filler port 24. A guide sleeve inner baffle 72 is located on one side of the dustproof ring 71, and a shaft seal 73 is located on one side of the guide sleeve inner baffle 72. All three components—dustproof ring 71, guide sleeve inner baffle 72, and shaft seal 73—are in contact with the outer side of the piston rod 3. The dustproof ring 71 prevents external dust, moisture, and other contaminants from entering the cylinder block 2, avoiding problems such as oil contamination leading to jamming and damage. It also prevents oil leakage into the external environment, reducing the risk of contamination.

[0031] Specifically, a first sealing ring 74 is provided on the outer side of the guide sleeve 7 near the oil filling port 24, an outer baffle 75 is provided on one side of the first sealing ring 74, and a second sealing ring 76 is provided on the outer side of the middle part of the guide sleeve 7. The first sealing ring 74, the outer baffle 75, and the second sealing ring 76 are all in contact with the inner side of the cylinder body 2. The first sealing ring 74, the second sealing ring 76, and the shaft sealing ring 73 ensure that the oil in the rod chamber 21 is discharged only through the internal channel of the intermediate cylinder 1, preventing leakage to the outside.

[0032] The principle of this embodiment is as follows:

[0033] The intermediate cylinder 1 injects hydraulic oil into the rodless chamber 22 through the hydraulic port 23, pushing the piston part 4 to move. The piston rod 3 moves along with it. When the piston rod 3 is about to rise to its position, the oil in the rod chamber 21 enters the buffer oil chamber 31 through the rod passage 51 and the piston passage 52, which significantly increases the flow resistance of the hydraulic oil, offsetting part of the inertial force and forcing the piston part 4 to gradually reduce its movement speed, thus avoiding collision with the cylinder 2 and protecting the structure of the intermediate cylinder 1. When the oil filler port 24 starts to inject oil, the oil enters the rod chamber 21, and the piston part 4 begins to reset. Under certain conditions, the one-way valve 62 opens, and the oil in the buffer oil chamber 31 flows into the rodless chamber 22 through the one-way valve 62, which plays a certain role in oil return.

[0034] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0035] Although this document frequently uses terms such as intermediate cylinder 1, cylinder body 2, rod chamber 21, rodless chamber 22, hydraulic port 23, filler port 24, piston rod 3, buffer oil chamber 31, piston connecting groove 32, piston part 4, rod body connecting part 41, piston wire retaining ring 42, piston support ring 43, SPGO type Glyd ring 44, lifting buffer structure 5, rod body channel 51, piston channel 52, lifting buffer assembly 6, valve body mounting groove 61, one-way valve 62, return oil channel 63, retaining ring mounting groove 64, piston baffle 65, elastic retaining ring for bore 66, guide sleeve 7, dustproof ring 71, inner baffle of guide sleeve 72, shaft sealing ring 73, first sealing ring 74, outer baffle of guide sleeve 75, and second sealing ring 76, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A front moving vehicle door frame lifting buffer device, comprising an intermediate oil cylinder (1) arranged between an inner door frame and a fork connecting seat, the intermediate oil cylinder (1) comprising a cylinder body (2) and a piston rod (3) movably arranged in the cylinder body (2), one end of the piston rod (3) being provided with a piston part (4) located in the cylinder body (2), the other end of the piston rod (3) being connected with the fork connecting seat, the lower end of the cylinder body (2) being connected with the inner door frame, a rod cavity (21) being arranged between the piston rod (3) and the cylinder body (2), the piston part (4) being provided with a rodless cavity (22) at the other end thereof, and the rodless cavity (22) being connected with a hydraulic oil port (23) at one end of the cylinder body (2), characterized in that, The piston rod (3) has a buffer oil cavity (31) inside, and the piston rod (3) and the piston part (4) are provided with a lifting buffer structure (5) which can make the rod cavity oil in the rod cavity (21) enter the buffer oil cavity (31) when the piston part (4) moves to the end of the cylinder (2) away from the hydraulic oil port (23).

2. A front-approaching door frame hoisting buffer device according to claim 1, characterized in that, The piston part (4) is provided with a rod body connecting part (41) at one end close to the piston rod (3), the piston rod (3) is provided with a piston connecting groove (32) corresponding to the rod body connecting part (41) at one end close to the piston part (4) inside, and the rod body connecting part (41) is provided with a piston steel wire retainer ring (42) in contact with the inside of the piston rod (3).

3. A front-approaching door frame hoisting buffer device according to claim 2, characterized in that, The piston part (4) is provided with a piston support ring (43) at one end away from the rod body connecting part (41), one side of the piston support ring (43) is provided with an SPGO type gasket (44), and the outer side of the SPGO type gasket (44) and the outer side of the piston support ring (43) are in contact with the inside of the cylinder (2).

4. A front-approaching door frame hoisting buffer device according to claim 2 or 3, characterized in that The lifting buffer structure (5) comprises a rod body channel (51) provided at one end of the piston rod (3) close to the piston connecting groove (32) and radially penetrating into the piston connecting groove (32), the inside of the rod body connecting part (41) is provided with a piston channel (52) corresponding to the rod body channel (51), the piston channel (52) is in L-shaped structure, one end of the piston channel (52) corresponds to the rod body channel (51), the other end axially penetrates to the outside of the rod body connecting part (41), and the inside of the piston part (4) is provided with a lifting buffer assembly (6).

5. A front-approaching door frame hoisting buffer device according to claim 4, characterized in that, The lifting buffer assembly (6) comprises a valve body mounting groove (61) provided at one end of the piston part (4) close to the rodless cavity (22) inside, the valve body mounting groove (61) is provided with a one-way valve (62) inside, one end of the valve body mounting groove (61) close to the rod body connecting part (41) is provided with an oil return channel (63) axially penetrating, the valve body mounting groove (61) is communicated with the piston connecting groove (32) through the oil return channel (63), and one end of the valve body mounting groove (61) away from the oil return channel (63) is communicated with the rodless cavity (22) through a retainer ring mounting groove (64).

6. A front-approaching door frame hoisting buffer device according to claim 5, characterized in that, The diameter of the retainer ring mounting groove (64) is greater than the diameter of the valve body mounting groove (61), the diameter of the valve body mounting groove (61) is greater than the diameter of the oil return channel (63), and the inside of one end of the retainer ring mounting groove (64) close to the valve body mounting groove (61) is provided with a piston retainer plate (65), one side of the piston retainer plate (65) is provided with a hole elastic retainer ring (66).

7. A front-approaching door frame hoisting buffer device according to claim 4, characterized in that, The buffer oil cavity (31) is provided at one end of the piston rod (3) close to the piston connecting groove (32) inside, the buffer oil cavity (31) is communicated with the piston connecting groove (32), one end of the rod body channel (51) away from the piston channel (52) is communicated with the rod cavity (21), and one end of the piston channel (52) away from the rod body channel (51) is communicated with the piston connecting groove (32).

8. A front-approaching door frame hoisting buffer device according to claim 1, characterized in that, The cylinder body (2) is provided with a guide sleeve (7) on the inner side of the end far from the hydraulic oil port (23), the guide sleeve (7) is located between the cylinder body (2) and the piston rod (3), the cylinder body (2) is provided with an oil filling port (24) on the end close to the guide sleeve (7), and the oil filling port (24) is connected with the rod cavity (21).

9. A lead car door frame hoist buffer device according to claim 8, characterized in that, The guide sleeve (7) is provided with a dustproof ring (71) on the inner side of the end far from the oil filling port (24), one side of the dustproof ring (71) is provided with a guide sleeve inner baffle (72), one side of the guide sleeve inner baffle (72) is provided with a shaft sealing ring (73), and the dustproof ring (71), the guide sleeve inner baffle (72) and the shaft sealing ring (73) are all in contact with the outer side of the piston rod (3).

10. A front-approaching door frame hoisting buffer device according to claim 8, characterized in that, The guide sleeve (7) is provided with a first sealing ring (74) on the outer side of the end close to the oil filling port (24), one side of the first sealing ring (74) is provided with a guide sleeve outer baffle (75), the outer side of the middle part of the guide sleeve (7) is provided with a second sealing ring (76), and the first sealing ring (74), the guide sleeve outer baffle (75) and the second sealing ring (76) are all in contact with the inner side of the cylinder body (2).

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