A new column type lifting machine

Abstract

This invention relates to a novel column lift, belonging to the field of motor vehicle lift technology, and particularly to a novel column lift. The invention provides a novel column lift with good performance. The invention includes a column (22), the lower end of which is connected to a base (1). The base (1) is equipped with a switch bracket (3), and the switch bracket (3) is equipped with a limit switch (2). The trigger rod of the limit switch (2) presses against the top of a top rod (32). A trolley (23) is installed inside the column (22). An upper limit switch (21) is installed on the upper part of the column (22), and a lower limit switch (25) is installed on the lower part of the column (22). A support arm (28) is installed on the trolley (23). A support frame (12) is installed at the lower part of the column (22), and a hydraulic trailer (6) is installed on the column (22) below the support frame (12).

Description

Technical Field

[0001] This invention belongs to the field of motor vehicle lift technology, and particularly relates to a novel column lift. Background Technology

[0002] A column lift is a single-column lifting device that uses an AC motor as a power source to drive a hydraulic pump to output hydraulic oil at a certain pressure, which in turn drives a hydraulic cylinder to lift the vehicle for maintenance.

[0003] Currently, there are many types of pole lifts on the market. Battery-powered pole lifts are in increasing demand due to their flexibility, independence from power cables, small footprint, and suitability for both indoor and outdoor use. However, users have increasingly higher requirements for the safety, reliability, and convenience of pole lifts, necessitating continuous product upgrades and replacements. Summary of the Invention

[0004] The present invention addresses the above-mentioned problems by providing a novel column lift with good performance.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: the present invention includes a column (22), the lower end of which is connected to a base (1), characterized in that a switch bracket (3) is provided on the base (1), a limit switch (2) is provided on the switch bracket (3), and the trigger rod on the limit switch (2) presses against the top of the top rod (32);

[0006] A trolley (23) is installed inside the column (22), an upper limit switch (21) is installed on the upper part of the column (22), and a lower limit switch (25) is installed on the lower part of the column (22); a support arm (28) is installed on the trolley (23);

[0007] A support frame (12) is provided at the lower part of the column (22), and a hydraulic trailer (6) is provided on the column (22) below the support frame (12);

[0008] The upper part of the column (22) is provided with an upper locking hook (17), and the middle part of the column (22) is provided with a middle locking hook (35); the upper locking hook (17) is fixed to the column (22) by an upper locking shaft (18), and the middle locking hook (35) is fixed to the column (22) by a middle locking shaft (36); an upper electromagnet (19) is provided on the column (22) above the upper locking hook (17), and a middle electromagnet (37) is provided on the column (22) above the middle locking hook (35); the lower movable iron core of the upper electromagnet (19) is connected to the upper locking hook (17), and the lower movable iron core of the middle electromagnet (37) is connected to the middle locking hook (35);

[0009] The trolley (23) is provided with multiple lock holes (39) corresponding to the upper lock hook (17) and the middle lock hook (35).

[0010] As a preferred embodiment, the limit switch (2) of the present invention is fixed to the switch bracket (3) by screws, the switch bracket (3) is fixed to the base (1) by screws, the column (22) is connected to the base (1) as a whole by bolts (9), and the support frame (12) is connected to the column (22) as a whole by bolts (10).

[0011] As another preferred embodiment, the upper end of the upper electromagnet (19) is fixed to the column (22) by the upper screw (20), and the movable iron core at the lower end of the upper electromagnet (19) is connected to the upper support lug (38) on the upper locking hook (17) by the screw; the upper end of the middle electromagnet (37) is fixed to the column (22) by the middle screw, and the movable iron core at the lower end of the middle electromagnet (37) is connected to the middle support lug on the middle locking hook (35) by the screw.

[0012] As another preferred embodiment, the lower end faces of the upper locking hook (17) and the middle locking hook (35) of the present invention are arc surfaces, and the lower horizontal edge of the lock hole (39) is machined into an outward bevel (40).

[0013] As another preferred embodiment, the hydraulic trailer (6) of the present invention is connected to the outer end of the connecting frame (4) by bolts (5) on both sides, and the pin (26) passes through the inner end through hole of the connecting frame (4) and the through hole on the column (22), and a retaining ring is provided at the end of the pin (26);

[0014] The top of the piston rod of the hydraulic trailer (6) is machined with a spherical cavity, and a steel ball (7) is installed in the spherical cavity; the lower end of the cylindrical support (34) connecting the support frame (12) and the top of the piston rod of the hydraulic trailer (6) is machined with a conical groove, and the upper end of the steel ball (7) rests on the conical groove, forming a movable hinge fulcrum between the hydraulic trailer (6) and the support frame (12).

[0015] As another preferred embodiment, the upper part of the plunger rod (6-1) of the present invention is provided with a groove (6-2), and the front end of the screw (11) is screwed through the threaded hole on the cylindrical support (34) and rests on the groove (6-2).

[0016] As another preferred embodiment, the cylindrical support of the present invention is welded onto the support frame (12).

[0017] As another preferred embodiment, the detection signal output ports of the upper limit switch (21) and the lower limit switch (25) of the present invention are connected to the control signal input port of the controller of the DC motor pump station (13); the DC motor pump station (13) is mounted on the column (22).

[0018] Secondly, the DC motor pump station (13) described in this invention is powered by a rechargeable battery (16).

[0019] In addition, according to the present invention, an isolation contactor (15) is provided between the charging battery (16) and the charger (14), and the charger (14) and the isolation contactor (15) are provided on the column (22).

[0020] The beneficial effects of this invention.

[0021] This invention has two locking hooks (upper locking hook 17 and middle locking hook 35), which are fixed to the column (22) by locking shafts and can rotate around the locking shafts. Under normal circumstances, the upper electromagnet (19) and the middle electromagnet (37) are not energized. Under the action of their respective gravity, the moving iron core in the middle of the electromagnet and the locking hook cause the lower end of the locking hook to swing towards the locking position in the direction of the trolley (23). The space occupied by the locking hook head in this locking position is located inside the space of the trolley (23). That is to say, when a certain square hole on the back of the trolley (23), i.e., the locking hole (39), is exactly in this locking position, the locking hook head will extend into this locking hole. When the trolley (23) slowly descends, when the hook of either of the two locking hooks is located in a certain locking hole on the back of the trolley (23), the trolley (23) continues to descend, causing the upper edge of the locking hole (39) to hook the locking hook (17), and the trolley (23) is locked in this position, thereby playing a safety protection role. Because of the use of a double safety lock with two locking hooks at the top and bottom, the number of locking holes (39) on the back of the trolley (23) is reduced by half within the lifting height of the lift, thereby reducing the overall height of the trolley (23). This reduction in height reduces the space occupied by the lift at its highest point, which is beneficial for use on the ground floor or inside factory buildings. The electromagnetic unlocking double safety lock mechanism ensures safety while making the lift trolley structure compact and reducing the overall space occupied by the lift.

[0022] The present invention comprises a limit switch (2), a switch bracket (3), and a top rod (32) forming a base (1) that is fully grounded and automatically detected, thereby avoiding damage to the lift and the resulting safety hazards caused by operational errors.

[0023] This invention features a maximum limit protection function. After the lift reaches a set height before its maximum limit height, it automatically stops rising, protecting the hydraulic system and improving its service life and safety. This maximum limit protection function is achieved by a limit switch (21): when the trolley (23) rises to the set height, it triggers the limit switch (21), which then sends a stop signal, stopping the DC motor pump station (13) and halting the lift's ascent.

[0024] This invention features a lower limit protection function. The lift automatically stops at a certain height (generally set at approximately 200mm from the working ground) before the lifting arm reaches its lowest position, alerting the operator to check the surroundings and preventing injury. This lower limit protection function is implemented by a limit switch (25): when the trolley (23) descends to the set height, it triggers the limit switch (25), which then sends a stop signal, stopping the DC motor pump station (13) and halting the lift's descent. After confirming there are no abnormalities around the lift and under the lifting vehicle, the operator presses the lowering button again to lower the lift to its lowest position. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. The scope of protection of the present invention is not limited to the following description.

[0026] Figure 1 This is the overall layout diagram of the lifting machine of the present invention.

[0027] Figure 2 This is a schematic diagram of the base structure of the present invention.

[0028] Figure 3 This is a partial schematic diagram of the bottom front end of the base assembly of the present invention.

[0029] Figure 4 This is a schematic diagram of the support wheel structure of the present invention.

[0030] Figure 5 This is a schematic diagram of the external structure of the front support arm of the present invention, which allows for manual and automatic unlocking.

[0031] Figure 6 This is a schematic diagram of the automatic unlocking structure of the front support arm of the present invention.

[0032] Figure 7 This is a schematic diagram of the internal structure of the front support arm of the present invention, which allows for manual and automatic unlocking.

[0033] Figure 8 This is a partial structural diagram of the manual and automatic unlocking of the front support arm of the present invention.

[0034] Figure 9 yes Figure 1 Enlarged view of part A.

[0035] Figure 10 yes Figure 5 Enlarged view of part B.

[0036] Figure 11 yes Figure 6 Enlarged view of part C.

[0037] Figure 12 yes Figure 7Enlarged view of part D.

[0038] Figure 13 This is another overall layout diagram of the lifting machine of the present invention.

[0039] Figure 14 This is an external view of the lifting machine of the present invention.

[0040] Figure 15 This is another view of the lifting machine of the present invention.

[0041] Figure 16 This is the electrical schematic diagram of the present invention.

[0042] Figure 17 This is a schematic diagram of the structure of the locking hook related components of the present invention.

[0043] Figure 18 yes Figure 17 Enlarged view of part I.

[0044] Figure 19 This is a schematic diagram of the working principle of the three-bar linkage of the present invention. Detailed Implementation

[0045] As shown in the figure, the present invention includes a column (22), the lower end of the column (22) is connected to the base (1), a switch bracket (3) is provided on the base (1), a limit switch (2) is provided on the switch bracket (3), and the trigger rod on the limit switch (2) presses against the top of the top rod (32);

[0046] A trolley (23) is installed inside the column (22), an upper limit switch (21) is installed on the upper part of the column (22), and a lower limit switch (25) is installed on the lower part of the column (22); a support arm (28) is installed on the trolley (23);

[0047] A support frame (12) is provided at the lower part of the column (22), and a hydraulic trailer (6) is provided on the column (22) below the support frame (12);

[0048] The upper part of the column (22) is provided with an upper locking hook (17), and the middle part of the column (22) is provided with a middle locking hook (35); the upper locking hook (17) is fixed to the column (22) by an upper locking shaft (18), and the middle locking hook (35) is fixed to the column (22) by a middle locking shaft (36); an upper electromagnet (19) is provided on the column (22) above the upper locking hook (17), and a middle electromagnet (37) is provided on the column (22) above the middle locking hook (35); the lower movable iron core of the upper electromagnet (19) is connected to the upper locking hook (17), and the lower movable iron core of the middle electromagnet (37) is connected to the middle locking hook (35);

[0049] The trolley (23) is provided with multiple lock holes (39) corresponding to the upper lock hook (17) and the middle lock hook (35).

[0050] The top rod seat (33) is welded onto the base assembly (1-1).

[0051] The limit switch (2) is fixed to the switch bracket (3) by screws, the switch bracket (3) is fixed to the base (1) by screws, the column (22) is connected to the base (1) by bolts (9), and the support frame (12) is connected to the column (22) by bolts (10).

[0052] The upper end of the upper electromagnet (19) is fixed to the column (22) by the upper screw (20), and the movable iron core at the lower end of the upper electromagnet (19) is connected to the upper support lug (38) on the upper locking hook (17) by the screw; the upper end of the middle electromagnet (37) is fixed to the column (22) by the middle screw, and the movable iron core at the lower end of the middle electromagnet (37) is connected to the middle support lug on the middle locking hook (35) by the screw.

[0053] Taking the above electromagnet (19) and upper locking hook (17) as examples (the middle electromagnet (37) and middle locking hook (35) are the same), in the free state where the upper electromagnet (19) is not energized, the movable iron core at the lower end of the upper electromagnet (19) is in a downward extension state under its own gravity, while the upper locking hook (17) rotates around the upper locking shaft (18) under its own gravity and is in a state of swinging towards the inside of the trolley (23). Under the combined action of the gravity of both, the upper locking hook (17) is always in a locked state.

[0054] The lower end faces of the upper locking hook (17) and the middle locking hook (35) are arc surfaces, and the lower horizontal edge of each lock hole (39) on the trolley (23) is machined into an outward slope (40). Due to the arc surface design below the hook and the slope design of the lower horizontal edge of the lock hole, when the trolley (23) rises, the non-square hole surface on the back of the trolley (23) will slide upward along the arc surface below the hook; when the hook slides into the lock hole (39), the trolley (23) continues to rise, and the arc surface below the hook contacts the slope (40) of the lower horizontal edge of the lock hole (39). While sliding, the hook is pushed away and swings away from the trolley (23). Therefore, the rise of the trolley (23) is not affected by the hook.

[0055] When the locking button SB4 on the operation panel (8) is pressed, the unloading valve YV1 is energized and opened, and the coils of the upper electromagnet (19) and the middle electromagnet (37) are de-energized; as mentioned above, the upper locking hook (17) and the middle locking hook (35) are in the locked position at this time. The trolley (23) descends slowly, and when either of the two locking hooks is located in a certain lock hole (square hole) on the back of the trolley (23), the trolley (23) continues to descend, causing the upper edge of the lock hole to hook the locking hook, and the trolley (23) is locked in that position, thereby playing a safety protection role.

[0056] When the descent button SB3 on the operation panel (8) is pressed, the unloading valve YV1 is energized and opened, the electromagnet coils YA1 and YA2 are energized and attracted, the movable iron core moves upward, and drives the lower hooks of the upper locking hook (17) and the middle locking hook (35) to swing away from the plane where the upper locking hole (39) of the trolley (23) is located, and the trolley (23) descends slowly.

[0057] The hydraulic trailer (6) is connected to the outer end of the connecting frame (4) by bolts (5) on both sides. The pin (26) passes through the inner end through hole of the connecting frame (4) and the through hole on the column (22). A retaining ring is provided at the end of the pin (26).

[0058] The top of the piston rod (6-1) of the hydraulic trailer (6) is machined with a spherical cavity, and a steel ball (7) is installed in the spherical cavity; the lower end of the cylindrical support (34) connecting the support frame (12) and the top of the piston rod (6-1) of the hydraulic trailer (6) is machined with a conical groove, and the upper end of the steel ball (7) rests on the conical groove, forming a movable hinge fulcrum between the hydraulic trailer (6) and the support frame (12).

[0059] The upper part of the plunger rod (6-1) is provided with a groove (6-2), and the front end of the screw (11) is screwed through the threaded hole on the cylindrical support (34) and rests on the groove (6-2). The groove (6-2) on the upper part of the plunger rod (6-1) and the screw (11) resting on the groove (6-2) prevent the plunger rod (6-1) from coming out of the cylindrical support (34). When the plunger rod (6-1) is fully retracted, the entire hydraulic trailer (6) is "suspended" under the cylindrical support (34) due to the action of the screw (11), and at this time the moving wheels of the hydraulic trailer (6) are not in contact with the ground.

[0060] like Figure 19 As shown, the column (22) is connected to the base (1) as a whole by bolts (9), and the support frame (12) is connected to the column (22) as a whole by bolts (10). In this way, the support frame (12), the column (22), and the base (1) become a whole, which can be regarded as a "link". The other two "links" are the hydraulic trailer (6) and the connecting frame (4). The movable hinge points of this three-bar linkage are the steel ball (7), the bolt (5), and the pin (26).

[0061] When the lift is unloaded (it is strictly forbidden to lift the hydraulic trailer (6) when it is loaded, otherwise it will cause damage to related components), when the plunger rod (6-1) of the hydraulic trailer (6) is lifted, the moving wheels of the hydraulic trailer (6) first descend and, after contacting the ground, remain fixed as a support point. Continue to lift the plunger rod (6-1), which is an extendable "link" in the three-bar linkage mechanism. One end of its hinge point bolt (5) remains fixed, while the other hinge point steel ball (7) rises. Since the lengths of the other two "links" are fixed, the other hinge point pin (26) in the three-bar linkage mechanism is "pulled up" at this time. Therefore, the end of the base assembly (1-1) near the hydraulic trailer (6) is lifted off the ground, that is, the rear end of the column lift is supported by the hydraulic trailer (6).

[0062] Before the pole lift is ready to lift the load, the hydraulic trailer (6) plunger rod (6-1) needs to be reset to the lowest position, so that the rear end of the base (1) falls to the ground. After the lift lifts the load, the eight rectangular cross-section springs (1-2-5) of the two support wheels (1-2) are compressed under the action of the load. This is manifested as the wheel axle (1-2-9) along with the nylon wheel (1-2-8) and spring seat (1-2-6) moving along the length of the long slot at both ends of the tube seat assembly (1-2-3). When it moves to the end, the entire nylon wheel (1-2-8) is completely retracted into the tube seat assembly (1-2-3), so the front end of the base assembly (1-1) also falls to the ground. In this way, the entire base (1) of the lift is in complete contact with the ground, which can play a more stable supporting role.

[0063] After the load is removed, the elastic force of the rectangular section spring (1-2-5) overcomes the weight of the lift and extends, pushing the axle (1-2-9) along with the nylon wheel (1-2-8) and spring seat (1-2-6) to move downwards along the length of the long slots (1-2-13) at both ends of the tube seat assembly (1-2-3), thus lifting the front end of the base assembly (1-1) off the ground. When the hydraulic trailer (6) lifts the rear end of the base (1), the entire lift can return to a movable state.

[0064] The cylindrical support is welded onto the support frame (12).

[0065] The base (1) includes a base assembly (1-1), on which a push rod seat (33) is provided. A spring (31) is fitted on top of the push rod (32). A cover plate (30) presses down on the spring (31) and is fixed to the push rod seat (33) with screws. A step is provided in the middle of the push rod (32). Under the elastic force of the spring (31), the step in the middle of the push rod (32) is pressed onto the step in the inner hole of the push rod seat (33). The lower end of the push rod (32) extends out of the push rod seat (33). The lower end of the push rod (32) extends out of the push rod seat (33) by a certain length, which is the trigger stroke of the limit switch (2).

[0066] The cover plate (30) has a round hole in the middle, and the upper end of the top rod (32) passes through the round hole in the middle of the cover plate (30) and contacts the trigger rod on the limit switch (2).

[0067] When the lower end of the push rod (32) contacts the working ground and is lifted, the limit switch (2) will be triggered, connecting the working circuit of the lift pump station (13), and the lift can be used normally. Conversely, when the base (1) is lifted because the plunger rod (6-1) of the moving trailer (6) has not fully fallen back, the push rod (32) is pressed down by the elastic force of the spring (31) due to the gap between the base (1) and the working ground. The top of the push rod (32) retracts, causing the trigger rod of the limit switch (2) to reset, thus cutting off the working circuit of the lift pump station (13). The lift cannot work normally, thus playing a protective role.

[0068] The detection signal output ports of the upper limit switch (21) and the lower limit switch (25) are connected to the control signal input port of the controller of the DC motor pump station (13); the DC motor pump station (13) is installed on the column (22).

[0069] The DC motor pump station (13) is powered by a rechargeable battery (16).

[0070] An isolation contactor (15) is provided between the charging battery (16) and the charger (14). Figure 16 The charger (14) and the isolation contactor (15) are mounted on the column (22).

[0071] The DC motor pump station (13) powered by a rechargeable battery (16) solves the limitations imposed by the length of the power cable and the location of the power source during the use of the pole lift, thus expanding the range of application areas for the lift. An isolation contactor (15) is added between the charger (14) and the battery (16) to effectively protect the battery (16) and prevent it from supplying reverse power to the charger (14) during lift use in a non-charging state, which would cause battery (16) wear and affect its service life.

[0072] like Figure 16 As shown, the rechargeable battery (16) (the rechargeable battery is...) Figure 16 GB) is sequentially connected to switch QS, emergency stop switch SB1 and ground contact detection switch SQ3 (SQ3 is Figure 1 One end of the limit switch 2) is connected;

[0073] The other end of SQ3 is connected to the lower limit switch SQ2 (SQ2 is...). Figure 1The lower limit switch 25) is connected to one end of the main power contactor KM1, one end of the normally closed switch SB3, one end of the normally closed switch SB2, and one end of the first normally open switch SB3.

[0074] The other end of SQ2 is connected to the control terminal of auxiliary relay KA1;

[0075] The other end of the normally closed switch SB3 passes through the upper limit switch SQ1 in sequence (SQ1 is...). Figure 1 The upper limit switch 21) and SB2 normally open switch are connected to the control terminal of the pump station starting contactor KM2;

[0076] The other end of the normally closed switch SB2 is connected to one end of the second normally open switch SB3 and one end of the locking switch SB4. The other end of the second normally open switch SB3 is connected to one end of the first normally closed switch KA1, one end of the first normally open switch KA1, one end of the first normally open switch of the auxiliary relay KA2, one end of the second normally open switch KA1, and one end of the second normally closed switch KA1.

[0077] The other end of the first normally closed switch KA1 is connected to a buzzer.

[0078] The other end of the first normally open switch KA1 is connected to the other end of the first normally open switch KA2 and the control terminal of KA2, respectively;

[0079] The other end of the second normally open switch KA1 is connected to the unloading valve YV1 (YV1 is...) via the second normally open switch KA2. Figure 1 The unloading valve of the medium hydraulic trailer 6), one end of the normally closed switch KA2, and the other end of SB4 are connected. The other end of the normally closed switch KA2 is connected to the other end of the second normally closed switch KA1.

[0080] The other end of the first normally open switch SB3 is connected to electromagnetic lock YA1 (YA1 is...) Figure 1 Electromagnet 19), electromagnetic lock YA2 (YA2 is...) Figure 1 The electromagnet 37 in the middle is connected.

[0081] During normal use, the ground contact detection switch SQ3 is closed, and the circuit is connected. When the descent button SB3 is pressed, the electromagnet coils YA1 and YA2 are energized and engage, opening the locking hook. When the lifting height exceeds the set height (generally set to 200mm-300mm; below this set height, the lower limit switch SQ2 activates), the lower limit switch SQ2 does not activate, the normally closed contact SQ2 remains closed, the auxiliary relay KA1 is energized, the normally open contact KA1 engages, the auxiliary relay KA2 is energized and self-locks through its own normally open contact KA2, the unloading valve YV1 is energized and opens, and the lifting platform descends. When the lifting platform descends to the set height, the lower limit switch SQ2 activates, the normally closed contact SQ2 opens, the auxiliary relay KA1 is de-energized, the normally open contact KA1 changes from engaged to open, the unloading valve YV1 is de-energized and closes, and the lifting platform stops descending. At this point, release the descent button SB3 and observe to confirm that there are no other personnel or objects under or around the lift boom to prevent accidents such as crushing injuries (this is also the purpose of setting the lower limit switch SQ2). After confirming that there are no abnormalities, press the descent button SB3 again. At this time, the auxiliary relays KA1 and KA2 are de-energized, and the unloading valve YV1 is energized and opened through the normally closed contacts KA1 and KA2. The electromagnet coils YA1 and YA2 are energized and attracted to open the locking hook, and the lift continues to descend. At the same time, the buzzer is energized and sounds until the lift reaches the lowest position and the descent button SB3 is released. The buzzer HA stops sounding.

[0082] Figure 16 The output shaft of the motor M is connected to the hydraulic pump shaft via a coupling to control the operation of the hydraulic pump. Figure 1 The position indicated by serial number 13 is motor M.

[0083] The lower front end of the base (1) is provided with a base support wheel (1-2), and the base support wheel (1-2) is installed in the rectangular tube square groove below the front end on both sides of the base assembly (1-1) by screws (1-3).

[0084] The base support wheel (1-2) includes a tube seat assembly (1-2-3), and a spring fixing plate (1-2-2) is provided at the upper end of the tube seat assembly (1-2-3). The spring fixing plate (1-2-2) has through holes at its four corners. The lower end of the screw (1-2-1) passes through the through holes and is screwed into the threaded hole at the upper end of the spring fixing nut (1-2-4). The cross-section of the spring fixing nut (1-2-4) is T-shaped, and the lower part of the spring fixing nut (1-2-4) is inserted into the upper end of the spring (1-2-5).

[0085] The lower end of the tube seat assembly (1-2-3) is provided with an L-shaped spring seat (1-2-6), and a protrusion is provided on the lower horizontal plate of the spring seat (1-2-6). The protrusion is inserted into the lower end of the spring (1-2-5).

[0086] A nylon wheel (1-2-8) is installed inside the tube seat assembly (1-2-3). The nylon wheel (1-2-8) is positioned between the springs (1-2-5). The axle (1-2-9) passes through the rear spring seat (1-2-6), the rear rolling bearing (1-2-7), the nylon wheel (1-2-8), the front rolling bearing (1-2-7), and the front spring seat (1-2-6) in sequence.

[0087] The upper end of the tube seat assembly (1-2-3) has connecting plates (1-2-12) extending outward on both sides, and the connecting plates (1-2-12) are provided with mounting holes for connecting with the base assembly (1-1).

[0088] The end of the axle (1-2-9) is provided with a positioning step (1-2-11) and two parallel planes (1-2-10), and the tube seat assembly (1-2-3) is provided with a long slot (1-2-13) corresponding to the end of the axle (1-2-9).

[0089] The base support wheels (1-2) are designed to automatically retract under load, so that the bottom surface of the base assembly (1-1) can be fully in contact with the working ground during the lifting process, which improves the stress state of the base assembly (1-1), protects the support wheels (1-2), and improves the stability of the lift.

[0090] The spring (1-2-5) is a rectangular cross-section spring, which is mounted on the spring seat (1-2-6). A spring fixing nut (1-2-4) is mounted on the top of each rectangular cross-section spring (1-2-5). Four rectangular cross-section springs (1-2-5) are assembled together using screws (1-2-1), spring fixing nuts (1-2-4), and spring fixing plates (1-2-2). For ease of description, the assembled components are referred to as assembly A. Assembly A is mounted on the elongated slots (1-2-13) at both ends of the tube seat assembly (1-2-3) via axles (1-2-9). Constrained by the elongated slots (1-2-13), assembly A can only move up and down along the length of the elongated slots (1-2-13).

[0091] Because the entire lift is heavy, the spring force used must be large enough, requiring the use of large-diameter spring steel wire. However, the installation space (height) is limited, and sufficient compression stroke must be ensured. Through testing, rectangular cross-section springs can well meet the above requirements.

[0092] After the support wheel (1-2) is installed on the base assembly (1-1), the tube seat assembly (1-2-3) in the support wheel (1-2) and the base assembly (1-1) are connected as one unit and cannot move relative to each other; the spring fixing plate (1-2-2) is pressed against the mounting plane of the tube seat assembly (1-2-3) on the base assembly (1-1) due to the elastic force of the rectangular cross-section spring (1-2-5), and also cannot move relative to each other; the wheel axle (1-2-9) together with the nylon wheel (1-2-8) and the spring seat (1-2-6) on it are pressed tightly against the lower position of the long slots at both ends of the tube seat assembly (1-2-3) due to the elastic force of the rectangular cross-section spring (1-2-5). At this position, when the column lift is unloaded, even under the weight of the entire lift, the elastic force of the rectangular section spring (1-2-5) still ensures that the nylon wheel (1-2-8) protrudes from the lowest part of the base assembly (1-1). Therefore, when the column lift is unloaded, the end of the base assembly (1-1) with the support wheel (1-2) is lifted off the ground. When the other end of the base assembly (1-1) is lifted by the hydraulic trailer (6), the unloaded column lift can be moved as a whole.

[0093] The nylon wheel (1-2-8) is located between two spring seats (1-2-6) and is mounted together with a wheel axle (1-2-9).

[0094] The nylon wheel (1-2-8) is equipped with rolling bearings (1-2-7) at both ends, which can rotate flexibly around the axle (1-2-9).

[0095] The support arm (28) includes a front support arm (28-5), the rear end of which is installed in the hole of the main support arm (28-1) through a support arm pivot (28-6). Without locking, the front support arm (28-5) can rotate around the support arm pivot (28-6); a crescent toothed wheel (28-5-1) is welded to the rear end of the front support arm (28-5).

[0096] The front end of the main support arm (28-1) is welded with a locking block groove (28-1-2). The locking block (28-13) is installed in the locking block groove (28-1-2). The locking block (28-13) can only move back and forth along the locking block groove (28-1-2) and cannot move left and right.

[0097] A return spring (28-8) is installed at the rear end of the locking block (28-13). The locking teeth of the locking block (28-13) engage with the crescent-shaped gear (28-5-1). Under normal circumstances, the elastic force of the return spring (28-8) ensures that the locking teeth of the locking block (28-13) are tightly engaged with the crescent-shaped gear (28-5-1). At the same time, the locking block slide groove (28-1-2) restricts the front support arm (28-5), thus locking it and preventing it from rotating.

[0098] The locking block (28-13) has a slot, and the lever (28-12) has a lever welded on it. The lever is inserted into the slot on the locking block (28-13).

[0099] The front end of the unlocking handle (28-4) is welded with a rotating sleeve (28-4-1), and the side of the unlocking handle (28-4) is welded with a fork (28-4-2); the fork (28-4-2) is inserted into the slot in the middle of the lever (28-12); the end of the lever (28-12) is provided with a round hole, and the handle fixing shaft (28-7) connects the lever (28-12) and the unlocking handle (28-4) together through the rotating sleeve (28-4-1) at the front end of the unlocking handle (28-4) and the round hole at the end of the lever (28-12); the handle fixing shaft (28-7) is fixed to the main support arm (28-1) with screws.

[0100] When the unlocking handle (28-4) is moved on the side of the forward support arm (28-5), the shift fork (28-4-2) moves the lever (28-12). The lever (28-12) causes the locking block (28-13) to overcome the elastic force of the return spring (28-8) and move along the locking block groove (28-1-2) towards the side of the return spring (28-8), causing the locking teeth of the locking block (28-13) to disengage from the crescent toothed gear (28-5-1). After disengagement, the front support arm (28-5) can rotate around the support arm pivot (28-6). After the current support arm (28-5) is rotated to the appropriate position, release the unlocking handle (28-4). Under the elastic force of the return spring (28-8), the locking block (28-13) moves toward the support arm pivot (28-6), so that the locking block (28-13) re-engages with the crescent tooth gear (28-5-1), locking the front support arm (28-5) so that it cannot rotate.

[0101] A circular hole is machined on the lower side of the front end of the main support arm (28-1), and the push rod (28-10-1) is installed in the circular hole and can move up and down along the circular hole; an adjusting bolt (28-10-2) is installed at the lower end of the push rod (28-10-1); the upper arc surface of the push rod (28-10-1) contacts the triangular plate (28-9); a circular hole is provided on the triangular plate (28-9), through which a self-locking nut is connected to the screw (28-1-1) and can rotate freely around the screw (28-1-1); the screw (28-1-1) is welded to the main support arm (28-1);

[0102] A screw (28-9-1) is welded onto a triangular plate (28-9), and a round hole is provided on a hook plate (28-11). The hook plate (28-11) is connected to the screw (28-9-1) on the triangular plate (28-9) through the round hole. The hook plate (28-11) can rotate around the screw (28-9-1). The arc surface below the hook plate (28-11) contacts the plate surface below the front end of the main support arm (28-1), and the hook plate (28-11) hooks onto the end of the lever (28-12).

[0103] When the support arm (28) is in its lowest position, the push rod (28-10) is pushed upward, causing the triangular plate (28-9) to rotate clockwise around the screw (28-9-1), thereby causing the hook plate (28-11) to hook the end of the lever (28-12) and move towards the push rod (28-10). As described above, at this time, the lever on the lever (28-12) will cause the locking block (28-13) to disengage from the crescent toothed gear (28-5-1), thereby achieving the purpose of unlocking the front support arm (28-5).

[0104] When the support arm (28) is lifted, as described above, the return spring (28-8) pushes the locking block (28-13) towards the crescent tooth gear (28-5-1), causing the locking block (28-13) to re-engage with the crescent tooth gear (28-5-1) and lock the front support arm (28-5). The locking block (28-13) simultaneously drives the end of the lever (28-12), which in turn drives the hook plate (28-11) to move in the same direction. Finally, the hook plate (28-11) drives the triangular plate (28-9) to rotate counterclockwise, which in turn drives the top rod (28-10) to move downward to the initial position under its own weight.

[0105] The front support arm (28-5) is designed with two swing locking and unlocking methods: manual unlocking (unlocked via unlocking handle 28-4) and automatic unlocking upon landing (unlocked when the top rod 28-10 is pushed upwards). This makes it convenient for users to adjust and lock the front support arm (28-5) and improves ease of use.

[0106] It is understood that the above specific description of the present invention is only for illustrating the present invention and is not limited to the technical solutions described in the embodiments of the present invention. Those skilled in the art should understand that modifications or equivalent substitutions can still be made to the present invention to achieve the same technical effect; as long as the use needs are met, they are all within the protection scope of the present invention.

Claims

1. A novel column-type lift, comprising a column (22), the lower end of which is connected to a base (1), characterized in that... A switch bracket (3) is provided on the base (1), and a limit switch (2) is provided on the switch bracket (3). The trigger rod on the limit switch (2) presses against the top of the top rod (32). A trolley (23) is installed inside the column (22), an upper limit switch (21) is installed on the upper part of the column (22), and a lower limit switch (25) is installed on the lower part of the column (22); a support arm (28) is installed on the trolley (23); A support frame (12) is provided at the lower part of the column (22), and a hydraulic trailer (6) is provided on the column (22) below the support frame (12); The upper part of the column (22) is provided with an upper locking hook (17), and the middle part of the column (22) is provided with a middle locking hook (35); the upper locking hook (17) is fixed to the column (22) by an upper locking shaft (18), and the middle locking hook (35) is fixed to the column (22) by a middle locking shaft (36); an upper electromagnet (19) is provided on the column (22) above the upper locking hook (17), and a middle electromagnet (37) is provided on the column (22) above the middle locking hook (35); the lower movable iron core of the upper electromagnet (19) is connected to the upper locking hook (17), and the lower movable iron core of the middle electromagnet (37) is connected to the middle locking hook (35); The trolley (23) is provided with multiple lock holes (39) corresponding to the upper lock hook (17) and the middle lock hook (35).

2. The novel column lift according to claim 1, characterized in that... The limit switch (2) is fixed to the switch bracket (3) by screws, the switch bracket (3) is fixed to the base (1) by screws, the column (22) is connected to the base (1) by bolts (9), and the support frame (12) is connected to the column (22) by bolts (10).

3. The novel column lift according to claim 1, characterized in that... The upper end of the upper electromagnet (19) is fixed to the column (22) by the upper screw (20), and the movable iron core at the lower end of the upper electromagnet (19) is connected to the upper support lug (38) on the upper locking hook (17) by the screw; the upper end of the middle electromagnet (37) is fixed to the column (22) by the middle screw, and the movable iron core at the lower end of the middle electromagnet (37) is connected to the middle support lug on the middle locking hook (35) by the screw.

4. The novel column lift according to claim 1, characterized in that... The lower end faces of the upper locking hook (17) and the middle locking hook (35) are arc surfaces, and the lower horizontal edge of the lock hole (39) is machined into an outward bevel (40).

5. A novel column lift according to claim 1, characterized in that... The hydraulic trailer (6) is connected to the outer end of the connecting frame (4) by bolts (5) on both sides. The pin (26) passes through the inner end through hole of the connecting frame (4) and the through hole on the column (22). A retaining ring is provided at the end of the pin (26). The top of the piston rod of the hydraulic trailer (6) is machined with a spherical cavity, and a steel ball (7) is installed in the spherical cavity; the lower end of the cylindrical support (34) connecting the support frame (12) and the top of the piston rod of the hydraulic trailer (6) is machined with a conical groove, and the upper end of the steel ball (7) rests on the conical groove, forming a movable hinge fulcrum between the hydraulic trailer (6) and the support frame (12).

6. A novel column lift according to claim 5, characterized in that... The upper part of the plunger rod (6-1) is provided with a groove (6-2), and the front end of the screw (11) is screwed through the threaded hole on the cylindrical support (34) and rests on the groove (6-2).

7. A novel column lift according to claim 5, characterized in that... The cylindrical support is welded onto the support frame (12).

8. A novel column lift according to claim 1, characterized in that... The detection signal output ports of the upper limit switch (21) and the lower limit switch (25) are connected to the control signal input port of the controller of the DC motor pump station (13); the DC motor pump station (13) is installed on the column (22).

9. A novel column lift according to claim 8, characterized in that... The DC motor pump station (13) is powered by a rechargeable battery (16).

10. A novel column lift according to claim 9, characterized in that... An isolation contactor (15) is provided between the charging battery (16) and the charger (14), and the charger (14) and the isolation contactor (15) are provided on the column (22).

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