A frame-type lifting mechanism

Abstract

This invention discloses a frame-type lifting mechanism, comprising a front support frame and a rear support frame spaced apart. The front support frame is provided with a first lifting part and / or a third lifting part, and the rear support frame is provided with a second lifting part and / or a fourth lifting part. The first lifting part is hinged to a first supporting unit, and / or the third lifting part is hinged to a third supporting unit; the second lifting part is hinged to a second supporting unit, and / or the fourth lifting part is hinged to a fourth supporting unit; an upper workpiece unit is supported between the first and second supporting units; and / or a lower workpiece unit is supported between the third and fourth supporting units; the first and second lifting parts move up and down synchronously or independently on their respective support frames; and / or the third and fourth lifting parts move up and down synchronously or independently on their respective support frames. This solution solves the problems of inconvenient lifting adjustment and poor stability, is suitable for large workpiece units, and can control overall or partial lifting.

Description

Technical Field

[0001] This invention belongs to the field of mechanical equipment technology, and specifically relates to a frame-type lifting mechanism. Background Technology

[0002] In industrial production, many pieces of equipment need to adjust the height of workpiece units through lifting mechanisms to adapt to different processes. Large workpiece units, in particular, have higher requirements for ease of adjustment and positional stability.

[0003] Existing conventional lifting mechanisms mostly use electric, pneumatic, or hydraulic drives. While these can meet basic requirements, they have significant shortcomings: electric drives are prone to damage from falling workpiece units due to unexpected power outages; pneumatic drives have low precision and are prone to wobbling; and hydraulic drives have the risk of leakage and high maintenance costs. Furthermore, instability in the lifting mechanism can damage the finished workpiece unit, affecting the entire work process.

[0004] In another existing solution, the lifting device is set as part of the external firmware, making the external firmware a necessary component of the equipment. This not only increases the overall complexity of the equipment and occupies additional production space, but also affects the lifting effect due to the working condition of the external firmware, and significantly increases the difficulty and cost of maintenance.

[0005] In summary, existing lifting mechanisms either pose safety and accuracy risks or increase equipment complexity due to reliance on external packaging, making them unsuitable for large workpiece units. Therefore, developing a lifting mechanism where the workpiece and lifting device form an independent unit without redundant components has become a pressing technical problem for the industry. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a frame-type lifting mechanism to solve the problems of inconvenient adjustment or poor stability of existing lifting mechanisms.

[0007] According to the technical solution of the present invention, the present invention provides a frame-type lifting mechanism, including a support frame, the support frame including a front support frame and a rear support frame arranged at intervals, the front support frame being provided with a first lifting part and / or a third lifting part, and the rear support frame being provided with a second lifting part and / or a fourth lifting part. The first lifting part is hinged to the first supporting unit, and / or the third lifting part is hinged to the third supporting unit; The second lifting part is hinged to the second supporting unit, and / or the fourth lifting part is hinged to the fourth supporting unit; The upper workpiece unit is supported between the first support unit and the second support unit; And / or, the lower workpiece unit is supported between the third support unit and the fourth support unit; The first and second lifting sections move up and down synchronously or independently on their respective support frames; And / or, the third and fourth lifting units move up and down synchronously or individually on their respective support frames.

[0008] In some embodiments, the first lifting part and / or the third lifting part are provided with a limiting mechanism for controlling the lifting part to be fixed in a fixed position on the support frame, and the second lifting part and / or the fourth lifting part are provided with a limiting mechanism for controlling the lifting part to be fixed in a fixed position on the support frame.

[0009] In some embodiments, the first lifting part, the second lifting part, the third lifting part, and the fourth lifting part are mechanical meshing mechanisms of gears and racks, or sliding rail and slider mechanisms driven by motors.

[0010] In some implementations, the front support frame and the rear support frame are two sets of longitudinally arranged lifting guide frames; A transverse support rod is provided between the front and rear sets of lifting guide frames. A lifting drive locking device is rotatably connected to both ends of the transverse support rod. The lifting drive locking device is movably installed on the lifting guide frame. The lifting guide frame is equipped with a vertical rack; the length direction of the horizontal support rod is left and right, and gears are set at both ends of the horizontal support rod, which mesh with the rack; the horizontal support rod is rotatably connected to the workpiece unit. A lifting power input shaft is rotatably connected to the lifting drive locking device at at least one end of the transverse support rod. One section of the lifting power input shaft is a worm gear, and a worm wheel is also provided on the transverse support rod. The worm gear and the worm wheel mesh. A locking pin is also movably connected to the lifting drive locking device. The locking pins on the lifting drive locking devices at both ends of the transverse support rod are connected through a pin synchronization mechanism. The end of the locking pin is detachably engaged with the tooth groove on the rack, or the end of the locking pin is detachably inserted into one of the locking pin holes in a row of locking pin holes on the rack, or the end of the locking pin is detachably inserted into one of the locking pin holes in a row of locking pin holes on the lifting guide frame.

[0011] In some embodiments, the pin synchronization mechanism includes a pin linkage rod, the length direction of which is left-right; the pin linkage rod is rotatably connected to the lifting drive locking device, and rotating arms are provided at both ends of the pin linkage rod. The rotating arms are rotatably connected to one end of the locking pin, and the other end of the locking pin extends toward the lifting guide frame.

[0012] In some embodiments, a resilient reset element is provided on the locking pin, the rotating arm, and / or the pin linkage.

[0013] In some embodiments, the lifting drive locking device includes a cylindrical portion sleeved on the outside of the lifting guide frame, with a wear-resistant pad and / or guide wheel provided between the inner side of the cylindrical portion and the lifting guide frame.

[0014] In some embodiments, a quick-release pin is also included, with a row of quick-release pin holes on the lifting guide frame that match the quick-release pin.

[0015] In some embodiments, the transverse support rod is rotatably connected to the workpiece unit via a bearing seat; at least one of the bearing seats on the front and rear sides of the workpiece unit has an elongated hole, the length direction of which is the front-rear direction, and a shoulder screw is inserted into the elongated hole, and the bearing seat is connected to the workpiece unit via the shoulder screw.

[0016] In some embodiments, the upper workpiece unit and the lower workpiece unit are static pressure boxes.

[0017] Compared with the prior art, the beneficial technical effects of the present invention are as follows: The frame-type lifting mechanism of this invention adopts a support frame type, which can be a support frame for the internal space structure of the processing equipment, without the need for an additional frame. The support frame is arranged at the front and rear to ensure the load-bearing effect. At least one lifting part is provided on the front and rear support frames and is hinged to the support unit. The workpiece is supported by the front and rear support units. Since the connection between the workpiece and the lifting part is hinged, the overall height of the workpiece can be controlled and the tilt angle can be adjusted by adjusting the height of the front and rear lifting parts. The workpiece is typically a static pressure box or a wind box. This solution can adjust the height position of its air outlet and fine-tune the air outlet angle, while ensuring the stability of such large equipment. In a preferred embodiment, a gear rack and worm gear lifting drive is used to make the workpiece unit move stably up and down along the lifting guide frame between the left and right sides. Electric and manual control are both convenient. A locking pin is provided to assist in positioning after the position is adjusted, further ensuring the stability of the workpiece unit during operation. The locking pins on both sides move synchronously, which is convenient for operation. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the frame-type lifting mechanism of the present invention.

[0019] Figure 2 yes Figure 1 A schematic diagram of the rear view structure.

[0020] Figure 3 yes Figure 2 A magnified view of the upper left corner.

[0021] Figure 4 yes Figure 1 The diagram shows the right-side view of the frame-type lifting mechanism.

[0022] Figure 5 yes Figure 4 A magnified view of the upper right corner.

[0023] Figure 6 This is a schematic diagram of the lifting drive locking device of the present invention.

[0024] Figure 7 yes Figure 6 Schematic diagram of the AA section structure.

[0025] Figure 8 yes Figure 6 The diagram shown is a bottom view of the lifting drive locking device.

[0026] Figure 9 yes Figure 1 A magnified view of part B in the middle section.

[0027] Explanation of reference numerals in the attached figures: 1. Workpiece unit; 2. Lifting guide frame; 3. Rack; 4. Lateral support rod; 5. Gear; 6. Lifting drive locking device; 7. Lifting power input shaft; 8. Worm gear; 9. Worm wheel; 10. Locking pin; 11. Pin linkage rod; 12. Rotating arm; 13. Pin lever; 14. Wear-resistant pad; 15. Guide wheel; 16. Anti-fall quick-release pin; 17. Anti-fall quick-release pin hole; 18. Bearing seat; 19. Long hole. Detailed Implementation

[0028] This invention provides a frame-type lifting mechanism that solves the problems of inconvenient adjustment or poor stability of existing frame-type lifting mechanisms, and can control the overall or partial lifting (adjusting the tilt angle).

[0029] This invention discloses a frame-type lifting mechanism, comprising a support frame for supporting and lifting workpieces. The support frame includes a front support frame and a rear support frame spaced apart. The front support frame is provided with a first lifting part and / or a third lifting part, and the rear support frame is provided with a second lifting part and / or a fourth lifting part. For example, the first and second lifting parts are a set of structures located at the upper part of the support frame, and the third and fourth lifting parts are another set of structures located at the lower part of the support frame. The support frame has at least one of these two sets, enabling the placement of one liftable workpiece at the top and bottom, or two liftable workpieces placed at both the top and bottom. This solution forms a lifting mechanism based on the support frame structure, ensuring overall stability and making it better suited for large workpiece equipment. Furthermore, it can be configured based on existing or necessary support frames, resulting in a simplified and compact overall structure.

[0030] The first lifting section is hinged to the first supporting unit, and / or the third lifting section is hinged to the third supporting unit; the second lifting section is hinged to the second supporting unit, and / or the fourth lifting section is hinged to the fourth supporting unit. In other words, each lifting section is hinged to a corresponding supporting unit, which will rise and fall with the lifting section. The hinged connection allows the supporting unit to rotate, so as to flexibly and stably support the workpiece.

[0031] The upper workpiece unit is supported between the first and second support units; and / or, the lower workpiece unit is supported between the third and fourth support units. The workpiece is supported by two (two sets) of support units, ensuring load-bearing capacity. At the same time, when the height positions of the front and rear support units are different, the workpiece can be controlled to tilt in the front-to-back direction, and the tilt angle of the workpiece can be finely adjusted to adapt to more refined and demanding process equipment.

[0032] The first and second lifting units move up and down synchronously or individually on their respective support frames; and / or the third and fourth lifting units move up and down synchronously or individually on their respective support frames. Depending on the specific lifting requirements, it can be set or controlled so that a set of corresponding lifting units at the front and rear move up and down synchronously or individually. For example, the overall height position of the workpiece can be adjusted by synchronous lifting, and the tilt angle of the workpiece can be adjusted by individually lifting one of them (in other words, adjusting the front and rear ends / local height of the workpiece).

[0033] Preferably, the first and / or third lifting parts are provided with limiting mechanisms for controlling the fixed position of the lifting parts on the support frame, and the second and / or fourth lifting parts are provided with limiting mechanisms for controlling the fixed position of the lifting parts on the support frame. The limiting mechanisms are used to control the position of the lifting parts, achieving a fixing effect during operation. Of course, this fixing effect can be released during lifting adjustment, and then fixed again after adjustment. The limiting mechanisms can be, for example, a pin mechanism, or other detachable components used to lock the structure.

[0034] Preferably, the first, second, third, and fourth lifting parts are mechanical meshing mechanisms using gears and racks, or motor-driven slide rail and slider mechanisms, or other mechanisms capable of lifting control, enabling convenient and precise control. Additionally, the lifting mechanism itself preferably has a limiting mechanism function, meaning its control structure allows it to be fixed at any height; optionally, a further limiting mechanism is provided to further ensure stable positioning and prevent accidental workpiece detachment.

[0035] Specifically, please refer to Figures 1 to 9The front and rear support frames consist of two sets of longitudinally arranged lifting guide frames 2. The lifting guide frames 2 are, for example, in the form of columns. More specifically, the support frame also includes upper and lower frames, which, together with the four sets of longitudinally arranged lifting guide frames 2, form a cuboid frame. A transverse support rod 4, capable of relative movement, is provided between the front and rear sets of lifting guide frames 2. Lifting drive locking devices 6 are rotatably connected to both ends of the transverse support rod 4. The lifting drive locking devices 6 are movably mounted on the lifting guide frames 2, for example, slidably sleeved on the lifting guide frames 2; in other words, the lifting guide frames 2 are equipped with lifting drive locking devices 6 that can be raised and lowered, and the lifting drive locking devices 6 are rotatably connected to the transverse support rod 4. The transverse support rod 4 can move longitudinally along the lifting guide frame 2. The relative position of the transverse support rod 4 and the workpiece unit 1 is fixed, used to support or carry the workpiece unit 1 to move longitudinally.

[0036] The first, second, third, and fourth lifting sections are, for example, all lifting drive locking devices 6. The first, second, third, and fourth support units are, for example, all transverse support rods 4. The upper workpiece unit and the lower workpiece unit refer to the workpiece units 1 located at the upper and lower parts, respectively. The support unit and the workpiece unit (or lifting section) are connected, for example, through a bearing seat (including a bearing), to achieve a hinged connection where the relative position is fixed but the rotation is flexible.

[0037] A vertical rack 3 is installed on the lifting guide frame 2, and the length direction of the transverse support rod 4 is left-right. Gears 5 are installed at both ends of the transverse support rod 4, and the gears 5 mesh with the rack 3. Thus, the transverse support rod 4 can rise and fall as the gears 5 rotate and move on the rack 3, and the workpiece unit 1 rises and falls with the transverse support rod 4. The transverse support rod 4 and the workpiece unit 1 are rotatably connected, for example, through a bearing seat. The transverse support rod 4 can rotate around its axis, while in the length direction of the transverse support rod 4, the transverse support rod 4 and the gears 5 on it are relatively fixed in position to the lifting drive locking device 6, so that the gears 5 are always meshed with the rack 3. During the lifting process, the height of the transverse support rod 4 moves while the transverse support rod 4 rotates around its axis, while the lifting drive locking device 6 and the workpiece unit 1 can only move up and down.

[0038] A lifting power input shaft 7 is rotatably connected to a lifting drive locking device 6 at at least one end of the transverse support rod 4. One section of the lifting power input shaft 7 is a worm gear 8, and a worm wheel 9 is also provided on the transverse support rod 4. The worm gear 8 and the worm wheel 9 mesh to form a worm gear transmission mechanism. Both the worm wheel 9 and the gear 3 are fixed relative to the transverse support rod 4. Therefore, by manually or electrically driving the lifting power input shaft 7 to rotate, the gear 3 can be driven to rotate, thereby achieving lifting.

[0039] A locking pin 10 is movably connected to the lifting drive locking device 6. The locking pins 10 on the lifting drive locking device 6 at both ends of the transverse support rod 4 are connected by a pin synchronization mechanism, so that the opening or locking states of the locking pins 10 at both ends are the same and they move synchronously. The end of the locking pin 10 is detachably engaged with the tooth groove on the rack 3, or the end of the locking pin 10 is detachably inserted into one of the locking pin holes in a row of locking pin holes on the rack 3, or the end of the locking pin 10 is detachably inserted into one of the locking pin holes in a row of locking pin holes on the lifting guide frame 2. In the lifting adjustment state, the locking pin 10 is separated from the cooperating engaging / inserting part (the locking pin 10 is in the open state) to lift; in the adjusted working state, the locking pin 10 is locked with the cooperating engaging / inserting part (the locking pin 10 is in the locked state). The locking pin 10 can assist in positioning the lifting drive locking device 6 to prevent the workpiece unit 1 from moving unexpectedly. In this embodiment, the locking pin 10 and related components are the limiting mechanism for controlling the lifting part to be fixed in the support frame. At the same time, the meshing gear 5, rack 3 and worm gear transmission mechanism also form a limiting structure.

[0040] In a specific embodiment, the pin synchronization mechanism includes a pin linkage rod 11, the length of which is lateral. The pin linkage rod 11 is rotatably connected to the lifting drive locking device 6. Rotating arms 12 are provided at both ends of the pin linkage rod 11, and each rotating arm 12 is rotatably connected to one end of a locking pin 10. The other end of the locking pin 10 extends towards the lifting guide frame 2. Therefore, when the locking pin 10 on one side is pulled up or inserted, the rotating arm 12 on that side will rotate, thereby causing the entire pin linkage rod 11 to rotate. The rotating arm 12 on the other side rotates synchronously, causing the locking pin 10 on the other side to perform the same action.

[0041] Please see Figure 6 , Figure 8 The locking pin 10 is connected to the lifting drive locking device 6 in a manner similar to a sliding connection. Specifically, near the lifting guide frame 2, a connecting post (or nail) limits the upper and lower sides of the locking pin 10. It is conceivable that in other embodiments, the locking pin 10 may also be fixed to, for example, the rotating arm 12, as long as it can achieve the function of inserting and removing from the locking position. It should be noted that... Figure 8 The position and dimensions of the lifting guide frame 2 are only schematically shown; the specific structures such as the rack 3 on the lifting guide frame 2 are not shown.

[0042] Preferably, a pin lever 13 is provided on the locking pin 10, the rotating arm 12, and / or the pin linkage rod 11. For example, the pin lever 13 is vertically connected to the rotating arm 12 on the side near the locking pin 10. The pin lever 13 is used to manually control the state of the locking pin 10. Lifting and lowering can only be performed by manually opening it during the equipment adjustment phase to avoid accidental triggering.

[0043] Preferably, a resilient reset element is provided on the locking pin 10, the rotating arm 12, and / or the pin linkage rod 11. In its natural state, the resilient reset element allows the locking pin 10 to move towards the lifting guide frame 2 and engage. For example, the pin linkage rod 11 (or rotating arm 12) is rotatably connected to the lifting drive locking device 6 via a bearing seat, and the resilient reset element is a return spring provided between the pin linkage rod 11 (or rotating arm 12) and the bearing seat. Providing a resilient reset element makes the operation of the locking pin 10 more convenient and further prevents the locking pin 10 from accidentally disengaging from its locked position.

[0044] Please see Figure 7 , Figure 8 Preferably, the lifting drive locking device 6 includes a cylindrical portion sleeved on the outside of the lifting guide frame 2, and a wear-resistant pad 14 and / or guide wheel 15 are provided between the inner side of the cylindrical portion and the lifting guide frame 2. More preferably, a total of eight guide wheels 15 are provided on one lifting drive locking device 6 (or one or two guide wheels may be omitted due to the presence of the lifting power input shaft 7, in order to minimize the size), so that the lifting drive locking device 6 is limited on the left and right sides of the lifting guide frame 2 by four guide wheels 15 distributed at the four corners, ensuring that the lifting drive locking device 6 does not tilt relative to the lifting guide frame 2.

[0045] Please see Figure 7 Preferably, both gear 5 and worm gear 9 are located inside the cylindrical part of the lifting drive locking device 6, thereby protecting gear 5 and worm gear 9 and making the structure compact and the size of the frame-type lifting mechanism as small as possible.

[0046] As a supplementary explanation Figures 6 to 8 The lifting drive locking device 6 shown can be manufactured as a separate component, with a shaft having gear 5 and worm gear 9 as its output shaft. This output shaft is then fixedly connected to the transverse support rod 4 (e.g., via a coupling) within the overall frame-type lifting mechanism structure. In other embodiments, the transverse support rod 4 can also be a single, integral shaft that passes through the lifting drive locking device 6. Such specific structural arrangements can be designed and adjusted according to production and installation needs, and various feasible solutions are possible, all essentially equivalent. The pin linkage rod 11 and the rotating arm 12 are arranged similarly.

[0047] Please see Figure 3 , Figure 5Preferably, it also includes anti-fall quick-release pins 16, and a row of anti-fall quick-release pin holes 17 matching the anti-fall quick-release pins 16 are provided on the lifting guide frame 2. In use, the anti-fall quick-release pins 16 are inserted into specific (generally closely spaced) anti-fall quick-release pin holes 17 below the lifting drive locking device 6, which can prevent uncontrollable falls when the gear rack or worm gear mechanism fails. Even if a fall occurs, the lifting drive locking device 6 will be stopped by the anti-fall quick-release pins 16, avoiding the workpiece unit 1 from falling onto other parts below and causing collisions and damage, providing another layer of protection in addition to the locking pins 10.

[0048] More specifically, the transverse support rod 4 is rotatably connected to the workpiece unit 1 via a bearing seat 18. At least one of the bearing seats 18 on either the front or rear sides of the workpiece unit 1 has an elongated hole 19, the length of which is in the front-rear direction. A shoulder screw passes through the elongated hole 19, and the bearing seat 18 is connected to the workpiece unit 1 via the shoulder screw. More specifically, the screw portion at the end of the shoulder screw is threadedly connected and fixed to the workpiece unit 1, and the smooth portion in the middle of the shoulder screw engages with the elongated hole 19 and can slide, thereby allowing the bearing seat 18 to move back and forth within a certain range on the workpiece unit 1. This allows the distance between the rotational connection points on the front and rear sides of the workpiece unit 1 to vary, thus enabling the lifting drive locking device 6 on the front and rear sides of the workpiece unit 1 to be set to different heights, causing the workpiece unit 1 to tilt at a certain angle in the front-rear direction.

[0049] In a typical embodiment, the upper workpiece unit and the lower workpiece unit are static pressure chambers (workpiece unit 1 is a static pressure chamber), and the overall equipment is a steel strip casting machine for producing films. The steel strip casting machine housing contains a steel strip and a static pressure chamber. The steel strip moves in the front-to-back direction, and the static pressure chamber is located above and / or below the steel strip, used to blow gas at a set temperature onto the steel strip. The distance between the static pressure chamber and the steel strip affects the heating temperature and film quality, and different types of films have different requirements. Traditional static pressure chambers are fixedly installed and cannot be easily adjusted in height. This solution solves this problem, facilitating the adjustment of the static pressure chamber's height while ensuring its stability during operation. More specifically, as... Figure 1As shown, the lifting guide frames 2 on both sides include two static pressure boxes arranged vertically opposite each other. The two static pressure boxes share the same set of lifting guide frames 2, and both static pressure boxes can be lifted and lowered. The steel belt is located between the upper and lower static pressure boxes. Furthermore, the four lifting guide frames 2 are connected at the upper and lower ends by structural components to form a cuboid frame, ensuring stability. The left and right sides of the static pressure box are connected by a transverse support rod 4 to ensure consistent lifting height on both sides. The front and rear sides of the static pressure box are connected by two transverse support rods 4 and bearing seats respectively. The lifting heights of the front and rear sides can be different, allowing the static pressure box to tilt at a certain angle relative to the horizontal plane in the front-to-back direction. This solution is particularly suitable for large steel strip casting machines with a large length, for example, an overall length of 40 meters. The steel strip will have a certain downward curvature. To ensure that the static pressure boxes distributed at various positions along the length are parallel to the steel strip (parallel to the film on the surface of the steel strip), the tilt angle of the static pressure boxes needs to be adjusted; otherwise, the film will experience uneven surface wind speed and uneven heating. Furthermore, it is especially important to ensure that the static pressure box in the steel strip casting machine is raised and lowered in a controllable manner, so as to prevent it from falling accidentally and causing collision damage to components such as the static pressure box and steel strip.

[0050] In summary, the frame-type lifting mechanism of the present invention adopts a support frame type, which can be a support frame for the internal space structure of the processing equipment without the need for an additional frame. The support frame is arranged at the front and rear to ensure the load-bearing effect. At least one lifting part is provided on the front and rear support frames and is hinged to the support unit. The workpiece is supported by the front and rear support units. Since the connection between the workpiece and the lifting part is hinged, the overall height of the workpiece can be controlled and the tilt angle can be adjusted by adjusting the height of the front and rear lifting parts. The workpiece is typically a static pressure box or a wind box. This solution can adjust the height position of its air outlet and fine-tune the air outlet angle, while ensuring the stability of such large equipment. In a preferred embodiment, a gear rack and worm gear lifting drive is used to make the workpiece unit move stably up and down along the lifting guide frame between the left and right sides. Electric and manual control are both convenient. A locking pin is provided to assist in positioning after the position is adjusted, further ensuring the stability of the workpiece unit during operation. The locking pins on both sides move synchronously, which is convenient for operation.

Claims

1. A frame-type lifting mechanism, comprising a support frame, characterized in that, The support frame includes a front support frame and a rear support frame arranged at intervals. The front support frame is provided with a first lifting part and / or a third lifting part, and the rear support frame is provided with a second lifting part and / or a fourth lifting part. The first lifting part is hinged to the first supporting unit, and / or the third lifting part is hinged to the third supporting unit; The second lifting part is hinged to the second supporting unit, and / or the fourth lifting part is hinged to the fourth supporting unit; An upper workpiece unit is supported between the first support unit and the second support unit; And / or, a lower workpiece unit is supported between the third support unit and the fourth support unit; The first lifting unit and the second lifting unit move up and down synchronously or independently on their respective support frames; And / or, the third lifting unit and the fourth lifting unit move up and down synchronously or individually on their respective support frames.

2. The frame-type lifting mechanism according to claim 1, characterized in that, The first lifting part and / or the third lifting part are provided with a limiting mechanism for controlling the lifting part to be fixed in a position on the support frame, and the second lifting part and / or the fourth lifting part are provided with a limiting mechanism for controlling the lifting part to be fixed in a position on the support frame.

3. The frame-type lifting mechanism according to claim 2, characterized in that, The first lifting part, the second lifting part, the third lifting part, and the fourth lifting part are mechanical meshing mechanisms of gears and racks, or sliding rail and slider mechanisms driven by motors.

4. The frame-type lifting mechanism according to claim 1, characterized in that, The front support frame and the rear support frame are two sets of lifting guide frames arranged longitudinally (2). A transverse support rod (4) is provided between the front and rear sets of lifting guide frames (2). A lifting drive locking device (6) is rotatably connected to both ends of the transverse support rod (4). The lifting drive locking device (6) is movably installed on the lifting guide frame (2). A vertical rack (3) is provided on the lifting guide frame (2); the length direction of the horizontal support rod (4) is left and right, and gears (5) are provided at both ends of the horizontal support rod (4), which mesh with the rack (3); the horizontal support rod (4) is rotatably connected to the workpiece unit (1); A lifting power input shaft (7) is rotatably connected to a lifting drive locking device (6) at at least one end of the transverse support rod (4). One section of the lifting power input shaft (7) is a worm (8). A worm wheel (9) is also provided on the transverse support rod (4). The worm (8) meshes with the worm wheel (9). A locking pin (10) is also movably connected to the lifting drive locking device (6). The locking pins (10) on the lifting drive locking device (6) at both ends of the transverse support rod (4) are connected by a pin synchronization mechanism. The end of the locking pin (10) is detachably engaged with the tooth groove on the rack (3), or the end of the locking pin (10) is detachably inserted into one of the locking pin holes in a row of locking pin holes on the rack (3), or the end of the locking pin (10) is detachably inserted into one of the locking pin holes in a row of locking pin holes on the lifting guide frame (2).

5. The frame-type lifting mechanism according to claim 4, characterized in that, The pin synchronization mechanism includes a pin linkage rod (11), the length direction of which is left and right; the pin linkage rod (11) is rotatably connected to the lifting drive locking device (6), and rotating arms (12) are provided at both ends of the pin linkage rod (11). The rotating arms (12) are rotatably connected to one end of the locking pin (10), and the other end of the locking pin (10) extends toward the lifting guide frame (2).

6. The frame-type lifting mechanism according to claim 5, characterized in that, A resilient reset element is provided on the locking pin (10), the rotating arm (12) and / or the pin linkage rod (11).

7. The frame-type lifting mechanism according to any one of claims 4 to 6, characterized in that, The lifting drive locking device (6) includes a cylindrical part sleeved on the outside of the lifting guide frame (2), and a wear-resistant pad (14) and / or guide wheel (15) are provided between the inner side of the cylindrical part and the lifting guide frame (2).

8. The frame-type lifting mechanism according to any one of claims 4 to 6, characterized in that, It also includes a quick-release pin (16), and a row of quick-release pin holes (17) matching the quick-release pin (16) are provided on the lifting guide frame (2).

9. The frame-type lifting mechanism according to any one of claims 4 to 6, characterized in that, The transverse support rod (4) is rotatably connected to the workpiece unit (1) through the bearing seat (18); at least one of the bearing seats (18) on the front and rear sides of the workpiece unit (1) has an elongated hole (19), the length direction of the elongated hole (19) is the front and rear direction, a shoulder screw is inserted into the elongated hole (19), and the bearing seat (18) is connected to the workpiece unit (1) through the shoulder screw.

10. The frame-type lifting mechanism according to any one of claims 1 to 3, characterized in that, The upper workpiece unit and the lower workpiece unit are static pressure boxes.

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