Roller bed pneumatic lifting device and lifting control method thereof

Abstract

The invention provides a roller bed pneumatic lifting device and a lifting control method thereof. The device is installed on a fixed base and comprises a pneumatic lifting mechanism and an anti-falling supporting mechanism. The pneumatic lifting mechanism comprises a jacking air cylinder, a guide mechanism and a synchronizing mechanism, the jacking air cylinder drives the roller bed fixing bracket to ascend and descend, and the guide mechanism and the synchronizing mechanism guarantee that the roller bed fixing bracket moves stably and accurately. And when the pneumatic lifting device has an accident, the anti-falling supporting mechanism can support the roller bed fixing bracket to prevent the roller bed from falling. The roller bed lifting device is simple and compact in structure, stable in operation, convenient to maintain and overhaul and suitable for a welding station needing roller bed lifting, and positioning of a vehicle body is achieved through falling of the roller bed.

Description

Technical Field

[0001] The invention relates to the field of welding equipment, and in particular to a roller bed pneumatic lifting device for welding equipment. Background Art

[0002] In the main production line of automobile body-in-white, the main body forming and welding stations all have the need to lift the roller bed. By lowering the roller bed, the automobile body-in-white can be separated from the conveying device and fixed on the fixture to achieve precise positioning of the body-in-white. However, the existing lifting roller bed has the following technical problems:

[0003] 1. Traditional lifting roller beds usually use air bags for lifting, and the lifting stroke is short, which cannot meet the needs of long-stroke lifting;

[0004] 2. The existing lifting mechanism lacks effective anti-fall protection devices, which poses a safety hazard;

[0005] 3. The synchronization and stability during the lifting process are poor, affecting the positioning accuracy. Summary of the invention

[0006] The purpose of the present invention is to provide a roller bed pneumatic lifting device and a lifting control method thereof, which can realize the lifting function of the roller bed and can realize large-stroke lifting, and has reasonable design, compact structure, accurate positioning, and safe and reliable performance.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] In a first aspect, a roller bed pneumatic lifting device is provided, comprising:

[0009] Fixed base;

[0010] A pneumatic lifting mechanism disposed on the fixed base;

[0011] Wherein, the pneumatic lifting mechanism comprises:

[0012] A lifting cylinder, wherein the lifting cylinder is arranged on the fixed base;

[0013] A roller bed fixing bracket connected to the cylinder rod of the jacking cylinder;

[0014] A guide mechanism for guiding the up and down movement of the roller bed fixing bracket; and

[0015] The synchronization mechanism is used for synchronously controlling the telescopic movement of the plurality of lifting cylinders.

[0016] In some optional embodiments of the present invention, the guide mechanism includes a guide sleeve support and a guide column, the guide column is installed on the roller bed fixed bracket, and the guide sleeve support is installed on the fixed base; the guide column slides in the guide sleeve support.

[0017] In some optional embodiments of the present invention, the synchronization mechanism includes a rack mounted on a roller bed fixing bracket, a synchronization gear shaft and a synchronization gear mounted on a fixed base, and the rack is meshed with the synchronization gear to synchronously control the telescopic movement of the lifting cylinder.

[0018] Preferably, the synchronization mechanism further comprises:

[0019] The gear shaft base is installed on the fixed base and is used to support the synchronous gear shaft.

[0020] In some optional embodiments of the present invention, the pneumatic lifting mechanism further includes:

[0021] A fixed limit block support, fixed on the fixed base;

[0022] A movable limit block support is fixed on the roller bed fixed bracket; and

[0023] An in-place detection mechanism, used for detecting the lifting and lowering position of the roller bed fixing bracket;

[0024] When the movable limit block support contacts the fixed limit block support, the extension stroke of the lifting cylinder is limited.

[0025] In some optional embodiments of the present invention, the pneumatic lifting mechanism further includes an in-position detection mechanism for detecting whether the roller bed fixing bracket has reached a predetermined position.

[0026] In some optional embodiments of the present invention, the device further comprises an anti-fall support mechanism disposed on the fixed base; the anti-fall support mechanism comprises:

[0027] Main body; anti-fall support arm;

[0028] A cylinder connected to the body;

[0029] A connecting rod mechanism, one end of which is connected to the output end of the cylinder, and the other end of which is connected to the anti-fall support arm;

[0030] The cylinder drives the connecting rod mechanism, thereby driving the anti-fall support arm to rotate to the bottom of the roller bed fixing bracket, so as to support the roller bed fixing bracket when the lifting cylinder fails.

[0031] Preferably, the connecting rod mechanism includes connecting rod 1 and connecting rod 2, the cylinder drives connecting rod 1 to rotate, and connecting rod 1 drives the anti-fall support arm to rotate through connecting rod 2.

[0032] Preferably, a support block is installed on the anti-fall support arm, and when the anti-fall support arm is rotated to a horizontal state, the support block is located below the anti-fall bracket of the roller bed fixing bracket.

[0033] Preferably, the anti-fall support mechanism further includes a lifting position detection mechanism and a falling position detection mechanism, which are used to detect the state of the anti-fall support arm.

[0034] In a second aspect, a lifting control method of a roller bed pneumatic lifting device is provided, comprising the following steps:

[0035] The lifting control steps include: controlling the cylinder rod of the lifting cylinder to extend, driving the roller bed fixed bracket to move upward; ensuring the stability and synchronization of the lifting process through the guide mechanism and the synchronization mechanism; when the movable limit block support contacts the fixed limit block support, stopping the lifting movement.

[0036] In some optional embodiments of the present invention, an anti-fall protection step is also included: after detecting the jacking-in-place signal, the cylinder of the anti-fall support mechanism is controlled to push the connecting rod mechanism to move; the anti-fall support arm is driven to rotate, so that the support block is flipped to a horizontal state.

[0037] Preferably, the anti-fall protection step further comprises: detecting the position state of the support block by a lifting position detection mechanism and a falling position detection mechanism.

[0038] In some optional embodiments of the present invention, a descent control step is also included: controlling the cylinder of the anti-fall support mechanism to retract so that the support block flips back; controlling the cylinder rod of the jacking cylinder to retract so that the roller bed fixed bracket descends; and limiting the descent position by dropping a limit support.

[0039] Preferably, the synchronization process of the synchronization mechanism includes: the rack moves with the roller bed fixing bracket to drive the synchronization gear to rotate, and the synchronization of the left and right sides is achieved through the synchronization gear shaft.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] 1. The present invention adopts a cylinder-driven lifting mechanism, which can achieve a larger lifting stroke than the traditional airbag lifting method to meet the needs of different working conditions;

[0042] 2. Through the innovative design of the anti-fall support mechanism, the roller bed fixing bracket can be supported in time when the cylinder fails, effectively preventing the roller bed from accidentally falling, thereby improving the safety of equipment operation;

[0043] 3. The guide mechanism and synchronization mechanism are set up to ensure the stability and synchronization of the lifting process and improve the positioning accuracy;

[0044] 4. It adopts modular design, compact structure, easy installation and maintenance, and high practicality.

[0045] The present invention realizes the smooth lifting of the roller bed with a large stroke by arranging a pneumatic lifting mechanism; the smooth and synchronous movement and accurate positioning of the roller bed fixing bracket are guaranteed by the coordinated action of the guide mechanism and the synchronization mechanism; at the same time, an anti-fall support mechanism is arranged, which can reliably support the roller bed fixing bracket to prevent it from falling in the event of failure of the lifting cylinder or an accident, thereby ensuring safety and reliability.

[0046] The invention has the advantages of simple and compact structure, stable operation, accurate positioning, safety and reliability, and is suitable for welding stations requiring the lifting of roller beds. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions of the embodiments disclosed in the present invention, the drawings of the embodiments will be briefly introduced below. These drawings are only used for illustrative purposes and are not intended to limit the protection scope of the present invention.

[0048] Figure 1 It is a structural schematic diagram of a roller bed pneumatic lifting device provided by an embodiment of the present invention;

[0049] Figure 2 is a structural schematic diagram of a pneumatic lifting mechanism provided by an embodiment of the present invention;

[0050] Figure 3 is a three-dimensional schematic diagram of an anti-fall support mechanism provided by an embodiment of the present invention Figure 1 ;

[0051] Figure 4 is a three-dimensional schematic diagram of an anti-fall support mechanism provided by an embodiment of the present invention Figure 2 ;

[0052] Figure 5 is a front view schematic diagram of an anti-fall support mechanism provided by an embodiment of the present invention;

[0053] In the figure: 100, fixed base; 200, pneumatic lifting mechanism; 201, lifting cylinder; 202, guide sleeve support; 203, guide column; 204, synchronous gear; 205, gear shaft base; 206, rack; 207, synchronous gear shaft; 208, fixed limit block support; 209, movable limit block support; 210, anti-fall support; 211, in-place detection mechanism; 212, roller bed fixed bracket; 213, drop limit support; 300, anti-fall support mechanism; 301, body; 302, cylinder; 303, cylinder fixed bracket; 304, connecting rod fixed bracket; 305, connecting rod one; 306, connecting rod two; 307, anti-fall support arm; 308, support block; 309, lifting position detection mechanism; 310, drop position detection mechanism. DETAILED DESCRIPTION

[0054] The technical solution of the present invention (including the preferred technical solution) is further described in detail below by means of the accompanying drawings and by listing some optional embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0055] Example 1

[0056] like Figures 1 to 5 As shown, the roller bed pneumatic lifting device provided in this embodiment includes a fixed base 1, a pneumatic lifting mechanism 2 and an anti-fall support mechanism 3. The device is mainly used in automobile body-in-white welding production lines to realize the lifting function of the roller bed.

[0057] The pneumatic lifting mechanism 2 comprises two lifting cylinders 201, a guide mechanism and a synchronization mechanism. The cylinder body of the lifting cylinder 201 is fixed on the fixed base 1, and the piston rod is connected to the roller bed fixed bracket 212 for driving the lifting movement of the roller bed fixed bracket 212.

[0058] The guide mechanism includes a guide post 203 disposed on the roller bed fixed bracket 212 and a guide sleeve support 202 disposed on the fixed base 1. The guide post 203 slides in the guide sleeve support 202 to ensure the stability and linearity of the roller bed fixed bracket 212 during the lifting process.

[0059] The synchronization mechanism includes a rack 206 installed on the roller bed fixed bracket 212, a synchronization gear shaft 207 installed on the fixed base 1, and a synchronization gear 204. The rack 206 is meshed with the synchronization gear 204, and the two synchronization gears 204 are connected through the synchronization gear shaft 207 to achieve the synchronous extension and retraction of the two lifting cylinders 201, ensuring that the left and right sides of the roller bed fixed bracket 212 are synchronously lifted and lowered to avoid jamming or deflection due to asynchronism.

[0060] The limiting mechanism is composed of a fixed limiting block support 208 and a movable limiting block support 209. When the roller bed fixed bracket 212 rises to a predetermined position, the movable limiting block support 209 contacts the fixed limiting block support 208 to limit the continued extension of the jacking cylinder 201 to prevent overshoot.

[0061] The in-position detection mechanism 211 is used to detect whether the roller bed fixing bracket 212 has reached a predetermined position, so as to facilitate the control system to perform status monitoring and action switching.

[0062] The anti-fall support mechanism 3 includes an anti-fall support arm 307, a cylinder 302 for driving the anti-fall support arm 307 to rotate, a connecting rod mechanism, and related brackets and detection mechanisms. The cylinder 302 is installed on the anti-fall support mechanism body 301 through a cylinder fixing bracket 303, and the piston rod of the cylinder 302 is connected to the connecting rod 1 305, and the connecting rod 1 305 is hinged to the body 301 through a connecting rod fixing bracket 304. The other end of the connecting rod 1 305 is hinged to the connecting rod 2 306, and the other end of the connecting rod 2 306 is hinged to the anti-fall support arm 307. The extension and contraction of the cylinder 302 drives the connecting rod mechanism to move, so that the anti-fall support arm 307 rotates around the axis.

[0063] A support block 308 is installed on the anti-fall support arm 307. When the cylinder 302 is extended, the anti-fall support arm 307 rotates to a horizontal position. The support block 308 is located under the anti-fall bracket 210 of the roller bed fixed bracket 212 to form a support to prevent the roller bed fixed bracket 212 from falling due to failure of the lifting cylinder 201 or insufficient air pressure.

[0064] The lifting position detection mechanism 309 and the falling position detection mechanism 310 respectively detect the lifting and falling positions of the anti-fall support arm 307 to ensure that the anti-fall support mechanism 3 operates reliably.

[0065] When the roller bed needs to be raised, the control system issues a command, and the lifting cylinder 201 extends, driving the roller bed fixed bracket 212 to move upward. The guide column 203 slides in the guide sleeve support 202 to ensure smooth movement. The rack 206 rises with the roller bed fixed bracket 212, driving the synchronous gear 204 to rotate. The synchronous gear 204 is connected through the synchronous gear shaft 207 to achieve synchronization between the left and right sides. The lifting cylinder 201 continues to extend, and when the movable limit block support 209 contacts the fixed limit block support 208, the lifting cylinder 201 stops extending. The in-place detection mechanism 211 detects the rising in-place signal.

[0066] Subsequently, the control system controls the anti-fall support mechanism 3 to move, the cylinder 302 extends, drives the connecting rod 1 305 to rotate, the connecting rod 1 305 drives the anti-fall support arm 307 to rotate to a horizontal position through the connecting rod 2 306, and the support block 308 is located below the anti-fall support 210 of the roller bed fixed bracket 212 to form a support. The lifting position detection mechanism 309 detects the lifting position to ensure that the anti-fall support mechanism 3 is in place.

[0067] When the roller bed needs to be lowered, the control system controls the anti-fall support mechanism 3 to reset, the cylinder 302 to retract, the anti-fall support arm 307 to rotate and retract under the drive of the connecting rod mechanism, and the drop position detection mechanism 310 detects that the anti-fall support arm 307 has returned to the initial position. Then, the lifting cylinder 201 retracts, and the roller bed fixed bracket 212 drops smoothly under the guidance of the guide column 203 and the guide sleeve support 202. The rack 206 drives the synchronous gear 204 to rotate in the opposite direction, and the left and right synchronization is ensured by the synchronous gear shaft 207. When the roller bed fixed bracket 212 drops to the drop limit support 213, the lifting cylinder 201 stops retracting, and the roller bed fixed bracket 212 stops moving.

[0068] Example 2

[0069] Based on Example 1, this example improves the guide mechanism. The guide mechanism can use a linear guide pair, the guide rail is fixed on the fixed base 1, and the slider is installed on the roller bed fixed bracket 212. The linear guide pair has the characteristics of high precision, low friction, and smooth movement, which can further improve the movement precision and stability of the roller bed fixed bracket 212.

[0070] Example 3

[0071] Based on the embodiment 1 or the embodiment 2, the present embodiment improves the synchronization mechanism. The synchronization mechanism can adopt a synchronous belt drive, with synchronous pulleys installed on both sides of the roller bed fixed bracket 212, and a synchronous belt installed on the fixed base 1, or a sprocket chain drive to ensure the synchronization of the left and right sides.

[0072] Example 4: Specific implementation of the lifting control method

[0073] The lifting control method provided in this embodiment includes the following specific steps:

[0074] Ascent process control:

[0075] Inject air into the extension chamber of the lifting cylinder 201 to extend the cylinder rod;

[0076] The cylinder rod drives the roller bed fixing bracket 212 to move upward;

[0077] The guiding mechanism and the synchronization mechanism work simultaneously to ensure a smooth and synchronous lifting process;

[0078] When the movable limit block support 209 contacts the fixed limit block support 208, the ascending action is completed.

[0079] Fall protection control:

[0080] After the arrival detection mechanism 211 detects that the roller bed fixing bracket 212 has reached the upper limit position, a signal is issued;

[0081] Control the cylinder 302 of the anti-fall support mechanism 3 to extend;

[0082] The cylinder 302 drives the four-bar linkage to move, driving the anti-fall support arm 307 to rotate;

[0083] The support block 308 is flipped to a horizontal state, and the support position detection mechanism 309 is lifted to confirm that it is in place.

[0084] Descent process control:

[0085] First, the cylinder 302 of the anti-fall support mechanism 3 is controlled to retract, so that the support block 308 is turned over and retracted;

[0086] The falling position detection mechanism 310 confirms that the support block 308 is fully retracted;

[0087] Inject air into the retraction chamber of the lifting cylinder 201 to retract the cylinder rod;

[0088] Under the action of the guide mechanism and the synchronization mechanism, the roller bed fixing bracket 212 descends smoothly;

[0089] Finally, the movement stops under the limiting effect of the falling limiting support 213.

[0090] Example 5: Specific implementation of the security protection mechanism,

[0091] This example focuses on the security protection mechanism of the device:

[0092] Mechanical safety protection:

[0093] The fixed limit block support 208 and the movable limit block support 209 cooperate to prevent the roller bed fixed bracket 212 from rising excessively;

[0094] The drop limit support 213 limits the lowest position to avoid accidental collision;

[0095] The anti-fall support mechanism 3 provides reliable mechanical support, ensuring safety even if the cylinder fails.

[0096] Electrical safety protection:

[0097] The in-place detection mechanism 211 monitors the lifting position in real time;

[0098] The lifting position detection mechanism 309 and the falling position detection mechanism 310 monitor the anti-fall support state;

[0099] All detection signals form interlock protection to ensure the correct action sequence.

[0100] The invention is very suitable for use in the main body forming welding station, meets the needs of roller bed lifting, and realizes the purpose of separating the automobile body from the conveying device and fixing it on the fixture through the lowering of the roller bed. The whole device has a simple and compact structure, stable operation, and convenient maintenance and repair.

[0101] Those skilled in the art will readily appreciate that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, combinations, replacements, improvements, etc. made within the spirit and principles of the present invention are included within the protection scope of the present invention.

Claims

1. A roller bed pneumatic lifting device, characterized in that: include: Fixed base; A pneumatic lifting mechanism disposed on the fixed base; Wherein, the pneumatic lifting mechanism comprises: A lifting cylinder, wherein the lifting cylinder is arranged on the fixed base; A roller bed fixing bracket connected to the cylinder rod of the jacking cylinder; A guide mechanism for guiding the up and down movement of the roller bed fixing bracket; and The synchronization mechanism is used for synchronously controlling the telescopic movement of the plurality of lifting cylinders.

2. The roller bed pneumatic lifting device according to claim 1 is characterized in that: The guide mechanism comprises a guide sleeve support and a guide column, wherein the guide column is mounted on the roller bed fixed bracket, and the guide sleeve support is mounted on the fixed base; the guide column slides in the guide sleeve support.

3. The roller bed pneumatic lifting device according to claim 1 is characterized in that: The synchronization mechanism comprises a rack installed on the roller bed fixing bracket, a synchronization gear shaft and a synchronization gear installed on the fixed base, and the rack is meshed with the synchronization gear to synchronously control the telescopic movement of the jacking cylinder.

4. The roller bed pneumatic lifting device according to claim 1, characterized in that: The pneumatic lifting mechanism also includes: A fixed limit block support, fixed on the fixed base; A movable limit block support is fixed on the roller bed fixed bracket; and An in-place detection mechanism, used for detecting the lifting and lowering position of the roller bed fixing bracket; When the movable limit block support contacts the fixed limit block support, the extension stroke of the lifting cylinder is limited.

5. The roller bed pneumatic lifting device according to claim 1, characterized in that: The pneumatic lifting mechanism also includes an in-position detection mechanism for detecting whether the roller bed fixing bracket has reached a predetermined position.

6. The roller bed pneumatic lifting device according to any one of claims 1 to 5, characterized in that: The device also includes an anti-fall support mechanism disposed on the fixed base; The anti-fall support mechanism comprises: Main body; anti-fall support arm; A cylinder connected to the body; A connecting rod mechanism, one end of which is connected to the output end of the cylinder, and the other end of which is connected to the anti-fall support arm; The cylinder drives the connecting rod mechanism, thereby driving the anti-fall support arm to rotate to the bottom of the roller bed fixing bracket, so as to support the roller bed fixing bracket when the lifting cylinder fails.

7. The roller bed pneumatic lifting device according to claim 6, characterized in that: The connecting rod mechanism comprises a connecting rod 1 and a connecting rod 2. The cylinder drives the connecting rod 1 to rotate, and the connecting rod 1 drives the anti-fall support arm to rotate through the connecting rod 2.

8. A lifting control method for a roller bed pneumatic lifting device according to any one of claims 1 to 7, characterized in that: Including lifting control steps: The cylinder rod of the jacking cylinder is controlled to extend, driving the roller bed fixing bracket to move upward; The smoothness and synchronization of the lifting process are ensured through the guiding mechanism and the synchronization mechanism; When the movable limit block support contacts the fixed limit block support, the upward movement stops.

9. The lifting control method of the roller bed pneumatic lifting device according to claim 8, characterized in that: Also includes fall protection steps: After the jacking-in-place signal is detected, the cylinder of the anti-fall support mechanism is controlled to push the connecting rod mechanism to move; The anti-fall support arm is driven to rotate, so that the support block is flipped to a horizontal state.

10. The lifting control method of the roller bed pneumatic lifting device according to claim 8 or 9, characterized in that: The invention also includes a descending control step: controlling the cylinder of the anti-fall support mechanism to retract so that the support block flips and retracts; controlling the cylinder rod of the jacking cylinder to retract so that the roller bed fixed bracket descends; The lowering position is limited by the drop limit support.

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