CN210438338U - Scissors fork lifting device with automatically adjustable gravity center of upper platform - Google Patents
Scissors fork lifting device with automatically adjustable gravity center of upper platform Download PDFInfo
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- CN210438338U CN210438338U CN201921155432.4U CN201921155432U CN210438338U CN 210438338 U CN210438338 U CN 210438338U CN 201921155432 U CN201921155432 U CN 201921155432U CN 210438338 U CN210438338 U CN 210438338U
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- fork arm
- gear shaft
- upper platform
- arm gear
- shaft
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Abstract
The utility model relates to a lift platform specifically is but upper platform focus automatically regulated cuts fork lifting device. The utility model drives the limit wheel shaft by the oil pressure of the hydraulic cylinder, and makes the limit wheel shaft displace along the lower track groove, changes the distance between the inner fork arm and the outer fork arm, thereby lifting or descending the upper platform; in the lifting or descending process, the inner fork arm gear shaft and the outer fork arm gear shaft are always positioned in the middle of the upper platform, so that the gravity center of the upper platform is always positioned in the middle of the upper platform. The utility model can realize uniform load distribution of the fork arm in the lifting process and eliminate the moment generated by gravity center shift in the lifting process of the upper platform; the auxiliary lifting arm may increase the longitudinal force component at the lowest position of the yoke.
Description
Technical Field
The utility model relates to a lift platform specifically is but upper platform focus automatically regulated cuts fork lifting device.
Background
In a traditional scissor lifting mechanism, one end of a fork arm between an upper platform and a lower base is hinged and fixed on the upper platform and the lower base respectively, the other end of the fork arm is connected with the upper platform and the lower base in a sliding manner, when a heavy object is placed on the upper platform for lifting operation, the gravity center of the upper platform deviates from the central planes of the two fork arms, the lifting operation stability is poor, and the lifting operation precision is influenced; when the fork arm is at the lowest position, the thrust of the hydraulic cylinder is great, and the fork arm only obtains extremely small component force in the longitudinal direction, so that the lifting of the fork arm is not facilitated.
SUMMERY OF THE UTILITY MODEL
The utility model aims at the not enough of above-mentioned prior art, but provide a but upper platform focus automatically regulated's fork lifting device cuts, lift the in-process, can make the upper platform focus be located the upper platform intermediate position all the time.
The technical scheme of the utility model as follows:
a scissor lifting device with an automatically adjustable upper platform gravity center comprises a lower base, an upper platform and a scissor structure arranged between the upper platform and the lower base, wherein the scissor structure is composed of two groups of scissor arms which are symmetrically arranged and a middle shaft for connecting the two groups of scissor arms, and each group of scissor arms is formed by the crossed arrangement of an outer fork arm and an inner fork arm;
the lifting device is characterized by also comprising a limit wheel shaft, an inner fork arm gear shaft, an outer fork arm gear shaft and a hydraulic cylinder; the bottom ends of the two outer fork arms are hinged to the outer side end of the lower base, the bottom ends of the two inner fork arms are hinged to the limiting wheel shaft together, the top ends of the two outer fork arms are hinged to the outer fork arm gear shaft together, and the top ends of the two inner fork arms are hinged to the inner fork arm gear shaft together;
two sides of the lower base are respectively provided with a lower track groove, and two ends of the limit wheel shaft are in rolling connection with the lower track grooves on the two sides of the lower base through rollers; two sides of the upper platform are respectively provided with an upper track groove matched with the inner fork arm gear shaft and the outer fork arm gear shaft, and two ends of the inner fork arm gear shaft and the outer fork arm gear shaft are respectively arranged on the upper track grooves at two sides through rollers;
a pair of racks arranged in parallel is arranged at the bottom of the upper platform, and gears matched with the racks are respectively arranged at the middle parts of the inner fork arm gear shaft and the outer fork arm gear shaft; the tail part of the hydraulic cylinder is hinged to the lower base, and the telescopic rod of the hydraulic cylinder is hinged to the middle part of the limiting wheel shaft to drive the upper platform to lift and drive the inner fork arm gear shaft and the outer fork arm gear shaft to move in the opposite direction or in the opposite direction through the meshed gears and racks.
Preferably, the lifting device is provided with a pair of auxiliary lifting arms, the middle part of the limiting wheel shaft is provided with an ear seat which is arranged downwards, and a telescopic rod of the hydraulic cylinder is hinged with the ear seat; one end of each auxiliary lifting arm is fixedly connected with the limiting wheel shaft, and the other end of each auxiliary lifting arm is suspended and extends to the position under the corresponding outer fork arm.
Preferably, the auxiliary lifting arm is arranged obliquely, and the suspended end of the auxiliary lifting arm is higher than the fixed end of the auxiliary lifting arm.
Preferably, the inner yoke gear shaft and the outer yoke gear shaft are stepped shafts, and gears of the inner yoke gear shaft and the outer yoke gear shaft are arranged in a staggered manner, and respectively correspond to and are meshed with the pair of racks.
Preferably, both ends of the inner yoke gear shaft and the outer yoke gear shaft are respectively provided with a threaded surface, the end parts of the inner yoke and the outer yoke are respectively sleeved on the corresponding threaded surfaces, and the corresponding yoke end is axially limited through a stepped surface of the stepped shaft and a nut.
When the utility model is used, the oil pressure of the hydraulic cylinder drives the limit wheel shaft, and the limit wheel shaft moves along the lower track groove, so as to change the distance between the inner fork arm and the outer fork arm, thereby lifting or descending the upper platform; in the lifting or descending process, the distance between the inner fork arm and the outer fork arm is changed, so that the inner fork arm gear shaft and the outer fork arm gear shaft are displaced along the upper track groove through the idler wheels, and meanwhile, the corresponding gears and the corresponding racks are meshed for transmission, so that the inner fork arm gear shaft and the outer fork arm gear shaft are always positioned in the middle of the upper platform, and the gravity center of the upper platform is always positioned in the middle of the upper platform.
In addition, in the lifting process, the hydraulic cylinder enables the limiting wheel shaft to rotate by pulling the lug seat below the limiting wheel shaft, and the suspended end of the auxiliary lifting arm which is obliquely arranged props against the corresponding outer fork arm to lift upwards, so that the auxiliary lifting effect is achieved.
The utility model can realize uniform load distribution of the fork arm in the lifting process and eliminate the moment generated by gravity center shift in the lifting process of the upper platform; the auxiliary lifting arm may increase the longitudinal force component at the lowest position of the yoke.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of the present invention;
FIG. 3 is a schematic structural view of the present invention (with the upper platform removed);
fig. 4 is a schematic structural view of the inner yoke gear shaft of the present invention;
fig. 5 is a schematic structural view of the outer yoke gear shaft of the present invention;
fig. 6 is a schematic structural view of the limit wheel shaft of the present invention;
fig. 7 is a schematic structural view of the auxiliary lifting arm of the present invention;
fig. 8 is a schematic structural view of the upper platform of the present invention;
in the figure: the device comprises a lower base 1, an upper platform 2, an intermediate shaft 3, an outer fork arm 4, an inner fork arm 5, a limit wheel shaft 6, an inner fork arm gear shaft 7, an outer fork arm gear shaft 8, a hydraulic cylinder 9, a lower track groove 10, a roller 11, an upper track groove 12, a rack 13, a gear 14, an auxiliary lifting arm 15, a lug seat 16, a thread surface 17 and a nut 18.
Detailed Description
As shown in the figure, the scissors lifting device with the gravity center of the upper platform capable of being automatically adjusted comprises a lower base 1, an upper platform 2 and a scissors structure arranged between the upper platform and the lower base, wherein the scissors structure is composed of two groups of symmetrically arranged scissors arms and a middle shaft 3 connected with the two groups of scissors arms, and each group of scissors arms is formed by arranging an outer fork arm 4 and an inner fork arm 5 in a crossed manner.
The lifting device is also provided with a limit wheel shaft 6, an inner fork arm gear shaft 7, an outer fork arm gear shaft 8 and a hydraulic cylinder 9; the bottom ends of the two outer fork arms are hinged to the outer side end of the lower base, the bottom ends of the two inner fork arms are hinged to the limiting wheel shaft together, the top ends of the two outer fork arms are hinged to the outer fork arm gear shaft together, and the top ends of the two inner fork arms are hinged to the inner fork arm gear shaft together.
Two sides of the lower base are respectively provided with a lower track groove 10, and two ends of the limit wheel shaft are in rolling connection with the lower track grooves on the two sides of the lower base through rollers 11; and the two sides of the upper platform are respectively provided with an upper track groove 12 matched with the inner fork arm gear shaft and the outer fork arm gear shaft, and the two ends of the inner fork arm gear shaft and the outer fork arm gear shaft are respectively installed on the upper track grooves on the two sides through rollers 11.
A pair of racks 13 arranged in parallel are arranged at the bottom of the upper platform, and gears 14 matched with the racks are respectively arranged at the middle parts of the inner fork arm gear shaft and the outer fork arm gear shaft; the tail part of the hydraulic cylinder is hinged with the lower base, and the telescopic rod of the hydraulic cylinder is hinged with the middle part of the limit wheel shaft to drive the upper platform to lift and drive the inner fork arm gear shaft and the outer fork arm gear shaft to move in the opposite direction or in the opposite direction through the meshed gear and the meshed rack.
The lifting device is provided with a pair of auxiliary lifting arms 15, the middle part of a limiting wheel shaft is provided with an ear seat 16 which is arranged downwards, and a telescopic rod of a hydraulic cylinder is hinged with the ear seat; one end of each auxiliary lifting arm is fixedly connected with the limiting wheel shaft, and the other end of each auxiliary lifting arm is suspended and extends to the position under the corresponding outer fork arm. The auxiliary lifting arm is obliquely arranged, and the suspended end of the auxiliary lifting arm is higher than the fixed end.
The inner fork arm gear shaft and the outer fork arm gear shaft are stepped shafts, and gears of the inner fork arm gear shaft and the outer fork arm gear shaft are arranged in a staggered mode and correspond to and are meshed with the pair of racks respectively. Threaded surfaces 17 are respectively arranged at two ends of the inner fork arm gear shaft and the outer fork arm gear shaft, the end parts of the inner fork arm and the outer fork arm are respectively sleeved on the corresponding threaded surfaces, and the corresponding fork arm ends are axially limited through a step surface of the stepped shaft and a nut 18.
The limiting wheel shaft is welded with a hydraulic cylinder lug seat, the direction is downward when the limiting wheel shaft is at the lowest position, two ends of the shaft are designed into a regular hexagon to fix an auxiliary lifting arm (the length of the auxiliary lifting arm is less than 1/2 of the inner fork arm and the outer fork arm), and the auxiliary lifting arm and the lug seat form a certain angle. When the hydraulic cylinder at the lowest position works, the torque in the anticlockwise direction is applied to the limiting wheel shaft, and the auxiliary lifting arm is driven to rotate upwards to have an upward component force on the outer fork arm.
Because the upper platform is provided with a pair of racks, the inner fork arm gear shaft and the outer fork arm gear shaft are respectively provided with gears which are symmetrically distributed. When the lifting mechanism is lifted, the inner fork arm gear shaft and the outer fork arm gear shaft are mutually closed at the same speed, and the gravity center of the upper platform is always kept on the middle plane of the fork arms.
Claims (5)
1. A scissor lifting device with an automatically adjustable upper platform gravity center comprises a lower base, an upper platform and a scissor structure arranged between the upper platform and the lower base, wherein the scissor structure is composed of two groups of scissor arms which are symmetrically arranged and a middle shaft for connecting the two groups of scissor arms, and each group of scissor arms is formed by the crossed arrangement of an outer fork arm and an inner fork arm;
the lifting device is characterized by also comprising a limit wheel shaft, an inner fork arm gear shaft, an outer fork arm gear shaft and a hydraulic cylinder; the bottom ends of the two outer fork arms are hinged to the outer side end of the lower base, the bottom ends of the two inner fork arms are hinged to the limiting wheel shaft together, the top ends of the two outer fork arms are hinged to the outer fork arm gear shaft together, and the top ends of the two inner fork arms are hinged to the inner fork arm gear shaft together;
two sides of the lower base are respectively provided with a lower track groove, and two ends of the limit wheel shaft are in rolling connection with the lower track grooves on the two sides of the lower base through rollers; two sides of the upper platform are respectively provided with an upper track groove matched with the inner fork arm gear shaft and the outer fork arm gear shaft, and two ends of the inner fork arm gear shaft and the outer fork arm gear shaft are respectively arranged on the upper track grooves at two sides through rollers;
a pair of racks arranged in parallel is arranged at the bottom of the upper platform, and gears matched with the racks are respectively arranged at the middle parts of the inner fork arm gear shaft and the outer fork arm gear shaft; the tail part of the hydraulic cylinder is hinged to the lower base, and the telescopic rod of the hydraulic cylinder is hinged to the middle part of the limiting wheel shaft to drive the upper platform to lift and drive the inner fork arm gear shaft and the outer fork arm gear shaft to move in the opposite direction or in the opposite direction through the meshed gears and racks.
2. The scissor lifting device with the automatically adjustable upper platform center of gravity as claimed in claim 1, wherein the lifting device is provided with a pair of auxiliary lifting arms, the middle part of the limiting wheel shaft is provided with an ear seat which is arranged downwards, and the telescopic rod of the hydraulic cylinder is hinged with the ear seat; one end of each auxiliary lifting arm is fixedly connected with the limiting wheel shaft, and the other end of each auxiliary lifting arm is suspended and extends to the position under the corresponding outer fork arm.
3. The scissors lifting device with the upper platform with the gravity center capable of being automatically adjusted as claimed in claim 2, wherein the auxiliary lifting arm is arranged in a tilted manner, and the suspended end of the auxiliary lifting arm is higher than the fixed end of the auxiliary lifting arm.
4. The scissors lifting device with the automatically adjustable upper platform center of gravity as claimed in claim 1, wherein the inner fork arm gear shaft and the outer fork arm gear shaft are stepped shafts, and the gears of the inner fork arm gear shaft and the outer fork arm gear shaft are arranged in a staggered manner and respectively correspond to and mesh with a pair of racks.
5. The scissors lifting device with the automatically adjustable upper platform center of gravity as claimed in claim 4, wherein the inner fork arm gear shaft and the outer fork arm gear shaft are respectively provided with a threaded surface at both ends, the end parts of the inner fork arm and the outer fork arm are respectively sleeved on the corresponding threaded surfaces, and the corresponding fork arm end is axially limited by the stepped surface of the stepped shaft and the nut.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921155432.4U CN210438338U (en) | 2019-07-22 | 2019-07-22 | Scissors fork lifting device with automatically adjustable gravity center of upper platform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921155432.4U CN210438338U (en) | 2019-07-22 | 2019-07-22 | Scissors fork lifting device with automatically adjustable gravity center of upper platform |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210438338U true CN210438338U (en) | 2020-05-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921155432.4U Active CN210438338U (en) | 2019-07-22 | 2019-07-22 | Scissors fork lifting device with automatically adjustable gravity center of upper platform |
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| CN (1) | CN210438338U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114291552A (en) * | 2021-12-31 | 2022-04-08 | 江***力机械有限公司 | Paint production line skid lifting and rotating platform |
-
2019
- 2019-07-22 CN CN201921155432.4U patent/CN210438338U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114291552A (en) * | 2021-12-31 | 2022-04-08 | 江***力机械有限公司 | Paint production line skid lifting and rotating platform |
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