Novel air pressure supporting cylinder

Abstract

The utility model discloses a novel air pressure supporting cylinder. The telescopic ejector rod is movably arranged in the cylinder body and extends upwards, the conical sleeve is installed at the lower end of the telescopic ejector rod in a sleeving mode, the inner piston is arranged in the cylinder body and arranged on the conical sleeve in a sleeving mode, the balls are arranged between the inner piston and the conical sleeve, and the re-pressing spring is arranged in the cylinder body and used for ejecting out the telescopic ejector rod. An upper air inlet and a lower air inlet which are used for pushing the inner piston to move downwards and upwards are formed in the cylinder body, the inner wall of the inner piston is a conical surface with the same inclination angle as the outer wall of the conical sleeve, and a first clamping spring used for limiting the balls is installed on the inner wall of the inner piston. The outer wall of the conical sleeve is provided with a protruding eave used for being matched with the first clamping spring to limit the ball.

Description

Technical field:

[0001] The utility model relates to the technical field of support cylinders, in particular to a novel pneumatic support cylinder. Background technology:

[0002] In CNC machine tools, pneumatic support cylinders are key pneumatic components used to achieve precise position control and load support for workbenches, tools, and workpieces. For example, CNC machine tools often use molds to clamp workpieces and cut or carve them during processing. Pneumatic support cylinders can be used to fix and adjust the position of the mold, as well as to position and support the workpiece in the mold, ensuring that the mold remains stable during processing to avoid processing errors caused by vibration or movement. At the same time, it can ensure that the support height is consistent after the workpiece is replaced, greatly improving the accuracy of batch processing parts. For example, a pneumatic support cylinder is disclosed in Chinese patent application No. 201420035344.1. In this patent, air is taken in through the first air passage 11 at the bottom, and the telescopic push rod 3 is pushed upward by pushing the small telescopic push rod 4. When the telescopic push rod 3 contacts the workpiece, the gas pushes the small telescopic push rod 4 upward and enters the third air passage 13. The conical telescopic push rod 2 begins to descend under a certain air pressure. Under the downward action of the conical telescopic push rod 2, the steel ball 7 forms a transverse extrusion on the receiving cone 51 of the jacket 5, forcing the inner diameter of the jacket 5 to shrink, thereby achieving the effect of holding the telescopic push rod 3 tightly. After the action is completed, the conical telescopic push rod 2 returns to its original position upward by relying on the restoring force of the pressure relief spring 22, the transverse pressure of the jacket 5 is released, the telescopic push rod 3 is reset under the action of the rising spring 31, and the small telescopic push rod 4 is reset. The structure is complex, requiring a large number of parts, each part fits tightly together, and requires high processing accuracy, resulting in high production costs, complex installation, and long time consumption. In addition, in order to ensure the movement of the conical telescopic top rod 2, the air in the inner cavity of the conical telescopic top rod 2 needs to be discharged through the fourth air channel 14 and the second air channel 12 to ensure the downward movement of the conical telescopic top rod 2, which makes the processing of parts more complicated and the cost further increased.

[0003] In view of this, the inventor proposes the following technical solution. Utility model content:

[0004] The utility model aims to overcome the deficiencies of the prior art and provide a novel pneumatic support cylinder.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions: a new type of pneumatic support cylinder, comprising: a cylinder body, a telescopic push rod movably arranged in the cylinder body and extending upward, a conical sleeve mounted on the lower end of the telescopic push rod, an inner piston arranged in the cylinder body and mounted on the conical sleeve, a plurality of balls arranged between the inner piston and the conical sleeve, and a compression spring arranged in the cylinder body and used to push out the telescopic push rod, the cylinder body is provided with an upper air inlet and a lower air inlet for pushing the inner piston downward and upward, the inner wall of the inner piston is a conical surface with an inclination angle consistent with that of the outer wall of the conical sleeve, and a first retaining spring for limiting the ball is installed on the inner wall of the inner piston, and a convex eaves for cooperating with the first retaining spring to limit the ball is provided on the outer wall of the conical sleeve.

[0006] Furthermore, in the above technical solution, a force-bearing convex ring portion for bearing the thrust of air pressure is provided on the outer wall of the inner piston, the force-bearing convex ring portion is located between the upper air inlet and the lower air inlet, and a travel groove is provided in the cylinder body for limiting the movement of the force-bearing convex ring portion.

[0007] Furthermore, in the above technical solution, the upper and lower ends of the cylinder body are provided with an upper end cover and a lower end cover for limiting the movement of the inner piston, wherein the lower end of the upper end cover is provided with an upper limit convex ring which is sleeved on the inner piston and extends to stop the force-bearing convex ring part, and the upper end surface of the lower end cover is provided with a lower limit convex ring which is sleeved on the inner piston and extends to stop the force-bearing convex ring part.

[0008] Furthermore, in the above technical solution, an upper notch groove is provided on the upper end face of the force-bearing convex ring part, and the upper notch groove is opposite to the upper air inlet after the force-bearing convex ring part contacts and presses with the upper limit convex ring; a lower notch groove is provided on the lower end face of the force-bearing convex ring part, and the lower notch groove can be connected with the lower air inlet after the force-bearing convex ring part contacts and presses with the lower limit convex ring, and an air duct for connecting the lower notch groove and the lower air inlet is provided between the outer wall of the lower limit convex ring and the inner wall of the cylinder body.

[0009] Furthermore, in the above technical solution, the telescopic top rod extends through the middle part of the upper end cover, and the middle part of the telescopic top rod is sleeved with a stop ring located between the conical sleeve and the upper end cover.

[0010] Furthermore, in the above technical solution, a first sealing ring and a second sealing ring are superimposed between the outer wall of the force-bearing convex ring part and the inner wall of the cylinder body, a third sealing ring and a fourth sealing ring are respectively arranged between the inner side wall and the outer side wall of the upper limit convex ring and the outer wall of the inner piston and the inner wall of the cylinder body, and a fifth sealing ring and a sixth sealing ring are respectively arranged between the inner side wall and the outer side wall of the lower limit convex ring and the outer wall of the inner piston and the inner wall of the cylinder body.

[0011] Furthermore, in the above technical solution, a protective cover is provided on the upper end of the telescopic top rod, and a flange sleeve portion is provided on the upper end of the upper end cover, which extends into the protective cover and is used to limit the position of the protective cover, and at least two limit pins are installed through the lower end of the protective cover and match the flange sleeve portion.

[0012] Furthermore, in the above technical solution, a top of the telescopic mandrel is also provided with a head which presses against the protective cover and is used to contact the workpiece, and the head is installed on the telescopic mandrel by means of a threaded connection.

[0013] Furthermore, in the above technical solution, a seventh sealing ring is also sleeved and installed on the protective cover, and the seventh sealing ring is located at the lower end of the protective cover and presses against the limit pin.

[0014] Furthermore, in the above technical solution, the upper end cover is transitionally fitted and clamped on the upper part of the cylinder body, and the lower end cover is limitedly installed on the lower part of the cylinder body by a second retaining spring.

[0015] After adopting the above technical scheme, the utility model has the following beneficial effects compared with the prior art: the utility model adopts a compound pressure spring to push the telescopic push rod out for support. When the upper end of the telescopic rod contacts the workpiece or other supporting plane, the airflow introduced from the upper air inlet pushes the inner piston to move downward, and the conical surface is used to push the ball to gradually close to the conical sleeve, and after the first retaining spring contacts the ball, the conical sleeve is clamped, thereby fixing the telescopic push rod in this position, so that it can no longer be telescopic and moved, so as to achieve stable support for the workpiece or other supporting surface. When it is necessary to adjust and change the support height, the airflow is changed to enter from the lower air inlet to push the inner piston upward, and the ball is loosened from holding the conical sleeve. At this time, the compound pressure spring generates thrust to push the telescopic push rod outward, and the telescopic push rod is in a retractable floating state, so as to adjust the support height again. Description of the drawings:

[0016] Figure 1 It is the internal structure diagram of the utility model;

[0017] Figure 2 It is a stereogram of the utility model. Specific implementation method:

[0018] The utility model is further described below in conjunction with specific embodiments and drawings.

[0019] See Figure 1 to Figure 2As shown, a new type of pneumatic support cylinder comprises: a cylinder body 1, a telescopic push rod 2 movably arranged in the cylinder body 1 and extending upward, a tapered sleeve 3 mounted on the lower end of the telescopic push rod 2, an inner piston 4 arranged in the cylinder body 1 and mounted on the tapered sleeve 3, a plurality of balls 5 arranged between the inner piston 4 and the tapered sleeve 3, and a compression spring 6 arranged in the cylinder body 1 and used for ejecting the telescopic push rod 2, the cylinder body 1 is provided with an upper air inlet A and a lower air inlet B for pushing the inner piston 4 downward and upward, the inner wall of the inner piston 4 is a conical surface with an inclination angle consistent with that of the outer wall of the tapered sleeve 3, and a first retaining spring 7 for limiting the ball 5 is installed on the inner wall of the inner piston 4, and a convex rim 31 for cooperating with the first retaining spring 7 to limit the ball 5 is provided on the outer wall of the tapered sleeve 3. The recompression spring 6 is used to push the telescopic push rod 2 out for support. When the upper end of the telescopic push rod 2 contacts the workpiece or other supporting plane, the airflow introduced from the upper air inlet A pushes the inner piston 4 downward, and the conical surface pushes the ball 5 to gradually close to the conical sleeve 3. After the first retaining spring 7 contacts the ball 5, the conical sleeve 3 is clamped, thereby fixing the telescopic push rod 2 in this position, so that it can no longer be telescopically moved, so as to achieve stable support for the workpiece or other supporting surface. When it is necessary to adjust and change the support height, the airflow is changed to enter from the lower air inlet B to push the inner piston 4 upward, and the ball 5 loosens the clamping of the conical sleeve 3. At this time, the recompression spring 6 generates a thrust to push the telescopic push rod 2 outward, and the telescopic push rod 2 is in a retractable floating state, so as to adjust the support height again.

[0020] The outer wall of the inner piston 4 is provided with a force-bearing convex ring portion 41 for bearing the thrust of gas pressure, and the force-bearing convex ring portion 41 is located between the upper air inlet A and the lower air inlet B, and the cylinder body 1 is provided with a stroke groove for limiting the movement of the force-bearing convex ring portion 41. The upper and lower ends of the cylinder body 1 are provided with an upper end cover 11 and a lower end cover 12 for limiting the movement of the inner piston 4, wherein the lower end of the upper end cover 11 is provided with an upper limit convex ring 111 which is sleeved on the inner piston 4 and extends to stop the force-bearing convex ring portion 41, and the upper end surface of the lower end cover 12 is provided with a lower limit convex ring 121 which is sleeved on the inner piston 4 and extends to stop the force-bearing convex ring portion 41. The force-bearing convex ring portion 41 of the inner piston 4 is limited by the cooperation of the upper limit convex ring 111 of the upper end cover 11 and the lower limit convex ring 121 of the lower end cover 12, and the stroke groove is formed at intervals.

[0021] The upper end surface of the force-bearing convex ring part 41 is provided with an upper notch groove 411, and the upper notch groove 411 is directly opposite to the upper air inlet A after the force-bearing convex ring part 41 is in contact and pressed with the upper limit convex ring 111; the lower end surface of the force-bearing convex ring part 41 is provided with a lower notch groove 412, and the lower notch groove 412 can be connected with the lower air inlet B after the force-bearing convex ring part 41 is in contact and pressed with the lower limit convex ring 121, and an air duct 122 for connecting the lower notch groove 412 and the lower air inlet B is provided between the outer wall of the lower limit convex ring 121 and the inner wall of the cylinder body 1. An upper notch groove 411 and a lower notch groove 412 are respectively arranged on the upper end face and the lower end face of the force-bearing convex ring part 41, so that after the force-bearing convex ring part 41 contacts with the upper limit convex ring 111 and the lower limit convex ring 121, the gas can still enter the upper and lower sides of the force-bearing convex ring 41 to generate sufficient thrust to push the inner piston 4, thereby avoiding the situation where the force-bearing convex ring part 41 cannot push the inner piston 4 to move because there is no gap between the upper limit convex ring 111 or the lower limit convex ring 121 for air to enter after the force-bearing convex ring part 41 contacts with the upper limit convex ring 111 or the lower limit convex ring 121.

[0022] The telescopic top rod 2 extends through the middle of the upper end cover 11, and a stop ring 20 is sleeved on the middle of the telescopic top rod 2 and is located between the conical sleeve 3 and the upper end cover 11. The stop ring 20 is clamped in the mounting hole of the upper end cover 11, and the stop ring 20 can effectively prevent the conical sleeve 3 from directly hitting the inner wall of the upper end cover 11 when moving with the telescopic top rod 2, thereby damaging the upper end cover 11, thereby improving the service life of the upper end cover 11.

[0023] A first sealing ring C1 and a second sealing ring C2 are stacked between the outer wall of the force-bearing convex ring portion 41 and the inner wall of the cylinder body 1, a third sealing ring C3 and a fourth sealing ring C4 are respectively arranged between the inner wall and the outer wall of the upper limit convex ring 111 and the outer wall of the inner piston 4 and the inner wall of the cylinder body 1, and a fifth sealing ring C5 and a sixth sealing ring C6 are respectively arranged between the inner wall and the outer wall of the lower limit convex ring 121 and the outer wall of the inner piston 4 and the inner wall of the cylinder body 1.

[0024] The upper end of the telescopic top rod 2 is sleeved with a protective cover 8, the upper end of the upper end cover 11 is provided with a flange sleeve portion 112 extending into the protective cover 8 and used to limit the position thereof, and at least two limit pins 80 matching the flange sleeve portion 112 are installed through the lower end of the protective cover 8.

[0025] The top of the telescopic push rod 2 is also provided with a push head 9 which is pressed against the protective cover 8 and is used to contact the workpiece. The push head 9 is installed on the telescopic push rod 2 by means of a threaded connection.

[0026] The protective cover 8 is also sleeved with a seventh sealing ring C7 , which is located at the lower end of the protective cover 8 and presses against the limiting pin 80 .

[0027] The upper end cover 11 is mounted on the upper part of the cylinder body 1 by transition fit, and the lower end cover 12 is mounted on the lower part of the cylinder body 1 by limiting the position through the second clamping spring 13 .

[0028] To sum up, when the utility model is used, in the initial state, the thrust generated by the compound compression spring 6 will keep the telescopic push rod 2 pushed outward, so that it rises to the uppermost end. At this time, no airflow enters the upper air inlet A and the lower air inlet B, and a certain gap is maintained between the inner piston 4 and the tapered sleeve 3. The ball 5 can move between the inner wall of the inner piston 4 and the outer wall of the tapered sleeve 3, and when the top head 9 is subjected to force, the telescopic push rod 2 can also be telescoped and floated accordingly; when support is required, the top head 9 contacts the supporting surface, pushing the telescopic push rod 2 to move downward. After reaching the required support position, gas is introduced from the upper air inlet A to push the inner piston 4 to move downward, and the inner piston The inner wall of 4 is a conical surface, which will push the ball 5 to approach and contact the tapered sleeve 3 during the descending process, and after the first retaining spring 7 contacts the ball 5, it will push the ball 5 to hold the tapered sleeve 3 tightly, thereby fixing the telescopic push rod 2 at this position, and using air pressure to apply to the upper end surface of the force-bearing convex ring portion 41 of the inner piston 4 to fix the support height of the telescopic push rod 2, thereby achieving stable support for the supporting surface; when support is not needed or the support height is changed, gas is introduced from the lower air inlet B to push the inner piston 4 to move upward, thereby gradually releasing the thrust on the ball 5, and then causing the ball 5 to loosen its hold on the tapered sleeve 3, at which time the telescopic push rod 2 can be telescopic again.

[0029] Of course, the above description is only a specific embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. Any equivalent changes or modifications made according to the structure, characteristics and principles described in the patent application scope of the present invention should be included in the patent application scope of the present invention.

Claims

1. A new type of pneumatic support cylinder, characterized in that: include: A cylinder body (1), a telescopic push rod (2) movably arranged in the cylinder body (1) and extending upward, a conical sleeve (3) sleeved and mounted on the lower end of the telescopic push rod (2), an inner piston (4) arranged in the cylinder body (1) and sleeved on the conical sleeve (3), a plurality of balls (5) arranged between the inner piston (4) and the conical sleeve (3), and a compression spring (6) arranged in the cylinder body (1) and used for pushing the telescopic push rod (2); the cylinder body (1) is provided with an upper air inlet (A) and a lower air inlet (B) for pushing the inner piston (4) downward and upward; the inner wall of the inner piston (4) is a conical surface with an inclination angle consistent with that of the outer wall of the conical sleeve (3); a first retaining spring (7) for limiting the ball (5) is installed on the inner wall of the inner piston (4); and a convex ridge (31) for cooperating with the first retaining spring (7) to limit the ball (5) is provided on the outer wall of the conical sleeve (3).

2. A novel pneumatic support cylinder according to claim 1, characterized in that: A force-bearing convex ring portion (41) for bearing the thrust of gas pressure is arranged on the outer wall of the inner piston (4), the force-bearing convex ring portion (41) is located between the upper air inlet (A) and the lower air inlet (B), and a travel groove for limiting the movement of the force-bearing convex ring portion (41) is arranged in the cylinder body (1).

3. A novel pneumatic support cylinder according to claim 2, characterized in that: The cylinder body (1) is provided with an upper end cover (11) and a lower end cover (12) at the upper and lower ends thereof for limiting the movement of the inner piston (4), wherein the lower end of the upper end cover (11) is provided with an upper limit convex ring (111) which is sleeved on the inner piston (4) and extends to stop the force-bearing convex ring portion (41), and the upper end surface of the lower end cover (12) is provided with a lower limit convex ring (121) which is sleeved on the inner piston (4) and extends to stop the force-bearing convex ring portion (41).

4. A novel pneumatic support cylinder according to claim 3, characterized in that: The upper end surface of the force-bearing convex ring portion (41) is provided with an upper notch groove (411), and the upper notch groove (411) is directly opposite to the upper air inlet (A) after the force-bearing convex ring portion (41) contacts and presses with the upper limit convex ring (111); the lower end surface of the force-bearing convex ring portion (41) is provided with a lower notch groove (412), and the lower notch groove (412) can be connected with the lower air inlet (B) after the force-bearing convex ring portion (41) contacts and presses with the lower limit convex ring (121), and an air channel (122) for connecting the lower notch groove (412) and the lower air inlet (B) is provided between the outer wall of the lower limit convex ring (121) and the inner wall of the cylinder body (1).

5. A novel pneumatic support cylinder according to claim 3, characterized in that: The telescopic top rod (2) extends through the middle of the upper end cover (11), and a stop ring (20) is sleeved on the middle of the telescopic top rod (2) and is located between the conical sleeve (3) and the upper end cover (11).

6. A novel pneumatic support cylinder according to claim 3, characterized in that: A first sealing ring (C1) and a second sealing ring (C2) are stacked between the outer wall of the force-bearing convex ring portion (41) and the inner wall of the cylinder body (1); a third sealing ring (C3) and a fourth sealing ring (C4) are respectively arranged between the inner wall and the outer wall of the upper limit convex ring (111) and the outer wall of the inner piston (4) and the inner wall of the cylinder body (1); and a fifth sealing ring (C5) and a sixth sealing ring (C6) are respectively arranged between the inner wall and the outer wall of the lower limit convex ring (121) and the outer wall of the inner piston (4) and the inner wall of the cylinder body (1).

7. A novel pneumatic support cylinder according to any one of claims 3 to 6, characterized in that: The upper end of the telescopic push rod (2) is sleeved with a protective cover (8), the upper end of the upper end cover (11) is provided with a flange sleeve portion (112) extending into the protective cover (8) and used to limit the position thereof, and at least two limit pins (80) are installed through the lower end of the protective cover (8) and match the flange sleeve portion (112) to lock the position.

8. A novel pneumatic support cylinder according to claim 7, characterized in that: The top of the telescopic push rod (2) is also provided with a push head (9) which is pressed against the protective cover (8) and is used to contact the workpiece. The push head (9) is installed on the telescopic push rod (2) by means of a threaded connection.

9. A novel pneumatic support cylinder according to claim 7, characterized in that: The protective cover (8) is also sleeved with a seventh sealing ring (C7), which is located at the lower end of the protective cover (8) and presses against the limit pin (80).

10. A novel pneumatic support cylinder according to claim 7, characterized in that: The upper end cover (11) is transitionally fitted and clamped on the upper part of the cylinder body (1), and the lower end cover (12) is limitedly mounted on the lower part of the cylinder body (1) by a second clamping spring (13).

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