CN211226181U - Lifting platform - Google Patents

Lifting platform Download PDF

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CN211226181U
CN211226181U CN201921826244.XU CN201921826244U CN211226181U CN 211226181 U CN211226181 U CN 211226181U CN 201921826244 U CN201921826244 U CN 201921826244U CN 211226181 U CN211226181 U CN 211226181U
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hinged
lifting platform
sliding block
bottom plate
platform according
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耿正
王春平
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Zhuhai Ruiling Welding Automation Co ltd
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Zhuhai Ruiling Welding Automation Co ltd
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Abstract

The utility model discloses a lifting platform, including supporting mechanism, cut fork mechanism, a second actuating mechanism for providing the first actuating mechanism of lift power and being used for improving the lift precision, supporting mechanism includes roof and bottom plate, through setting up first actuating mechanism and second actuating mechanism, utilize first actuating mechanism to provide the power of cutting the action of fork mechanism, utilize second actuating mechanism to fix a position the position of cutting fork mechanism, the locking piece of cooperation second slider makes the position of cutting fork mechanism remain unchanged simultaneously, thereby improve the precision that lifting platform height promoted effectively.

Description

Lifting platform
Technical Field
The utility model belongs to the technical field of industrial machine and specifically relates to a lift platform.
Background
The lifting platform is a common machine for lifting the height of materials, and is widely applied to logistics of an automatic production line. The scissor fork mechanism has the advantages of simple structure, high lifting ratio (at a high position/a lowest position), no need of auxiliary guide rails and upright posts protruding out of the platform, and the like, and is one of the common structures of the lifting platform. However, the conventional lifting platform adopting a scissor mechanism has poor height lifting precision and cannot meet the positioning requirement of a high-precision automatic logistics system.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a lifting platform can improve the precision of high promotion.
According to the utility model discloses a lift platform, include:
the supporting mechanism comprises a top plate and a bottom plate; a first sliding rail is arranged on the top plate, and a first sliding block is arranged on the first sliding rail; a second sliding rail is arranged on the bottom plate;
the shearing fork mechanism is provided with a first hinged end, a second hinged end, a third hinged end and a fourth hinged end, the first hinged end is hinged to the top plate, the second hinged end is hinged to the first sliding block, and the third hinged end is hinged to the bottom plate;
the first driving mechanism is used for providing lifting power and is respectively hinged with the scissor mechanism and the bottom plate;
and the second driving mechanism is used for improving the lifting precision, the second driving mechanism is provided with a second sliding block, a locking piece used for locking the position is arranged on the second sliding block, and the fourth hinged end is hinged on the second sliding block.
According to the utility model discloses a lift platform has following beneficial effect at least: through setting up first actuating mechanism and second actuating mechanism, utilize first actuating mechanism to provide the power of cutting the action of fork mechanism, utilize second actuating mechanism to fix a position the position of cutting the fork mechanism, the locking piece of cooperation second slider makes the position of cutting the fork mechanism remain unchanged simultaneously to improve the precision that lift platform height promoted effectively.
In some embodiments of the present invention, the first driving mechanism is a hydraulic cylinder, and can provide sufficient lifting thrust for the scissors mechanism.
In some embodiments of the present invention, the second driving mechanism includes a motor and a screw rod, and has the advantages of high precision, reversibility and high efficiency.
The utility model discloses an in some embodiments, the locking piece is the nut, can carry out the cooperation of auto-lock with the lead screw, utilizes simple structure to realize the rigidity of second slider.
In some embodiments of the present invention, the first position sensor is used for sensing the position of the second slider, and the first position sensor is disposed on the bottom plate, so that the first driving device and the second driving device can be automatically controlled by the first position sensor.
In some embodiments of the present invention, the first position sensor is a proximity switch, which is reliable in operation, stable in performance, and fast in frequency response.
The utility model discloses an in some embodiments, the quantity of first position sensor is two, set up respectively in the starting point and the terminal point of second slider glide path can realize the control to lift platform's rising and decline.
The utility model discloses an in some embodiments, second actuating mechanism still includes and is used for responding to the second position inductor of the position of second slider can respond to the real-time position of second slider to can conveniently control the second slider and stop on the optional position, adapt to the promotion control requirement of high change.
The utility model discloses an in some embodiments, second position sensor is photoelectric encoder, and the interference killing feature is strong, and the response precision is high moreover.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a second embodiment of the present invention;
fig. 3 is a schematic diagram of the relationship between the scissor structure and the height of the lifting platform according to the second embodiment of the present invention.
The relevant parts are numbered as follows:
the sliding fork type scissor-type scissor-type scissor-.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.
Referring to fig. 1, a first embodiment of the present invention provides a lifting platform, which includes a supporting mechanism, a scissor mechanism 300, a first driving mechanism for providing lifting power, and a second driving mechanism for improving lifting precision, wherein the supporting mechanism includes a top plate 110 and a bottom plate 210; a first slide rail 120 is arranged on the top plate 110, and a first slide block 130 is arranged on the first slide rail 120; the bottom plate 210 is provided with a second slide rail 220; the scissors mechanism 300 is provided with a first hinge end 311, a second hinge end 321, a third hinge end 322 and a fourth hinge end 312, wherein the first hinge end 311 is hinged on the top plate 110, the second hinge end 321 is hinged on the first sliding block 130, and the third hinge end 322 is hinged on the bottom plate 210; the first driving mechanism is hinged with the scissors mechanism 300 and the bottom plate 210 respectively; the second driving mechanism is provided with a second sliding block 230, a locking member for locking the position is arranged on the second sliding block 230, and the fourth hinged end 312 is hinged on the second sliding block 230.
Specifically, the scissors mechanism 300 includes a first body 310 and a second body 320 hinged at the center in a crossing manner, the two ends of the first body 310 are a first hinged end 311 and a fourth hinged end 312, respectively, and the two ends of the second body 320 are a second hinged end 321 and a third hinged end 322, respectively. The top plate 110 is provided with a fixed first hinge base 140, and the first hinge end 311 is hinged to the first hinge base 140. The bottom plate 210 is provided with a fixed second hinge base 240, and the third hinge end 322 is hinged on the second hinge base 240.
In this embodiment, the first driving mechanism is a hydraulic cylinder 400, which can provide sufficient lifting thrust for the scissors mechanism 300. In other embodiments, devices similar in principle to hydraulic cylinder 400 may be used as a source of thrust, such as a pneumatic cylinder or the like. Wherein, a fixed third hinge base 313 is arranged on the first body 310, a fixed fourth hinge base 250 is arranged on the bottom plate 210, two ends of the hydraulic cylinder 400 are respectively hinged on the third hinge base 313 and the fourth hinge base 250, wherein, an action end of the hydraulic cylinder 400 is hinged on the third hinge base 313.
In this embodiment, the second driving mechanism employs the motor 510 and the lead screw 520, and has the advantages of high precision, reversibility and high efficiency, and the second slider 230 is disposed on the lead screw 520. The motor 510 is a servo motor, which can control the rotation speed to accurately control the position of the second slider 230. Besides, the second driving mechanism can also adopt other devices which have a linear driving function, such as a motor crankshaft structure, an electric push rod structure and the like. The motor 510 may be fixed using a motor mount 511.
Correspondingly, the locking member is a nut 231 in this embodiment, and can be in self-locking engagement with the screw rod 520, and the position of the second slider 230 is fixed by using a simple structure.
In addition, in this embodiment, a first position sensor for sensing a position of the second slider 230 is further provided, the first position sensor is disposed on the bottom plate 210, and the first driving device and the second driving device can be automatically controlled by the first position sensor. As one of the preferable schemes, the first position sensor is a proximity switch 530, which has reliable action, stable performance and fast frequency response. Besides, the first position sensor may also be a sensor with similar functions, such as an infrared sensor, a laser sensor, etc., and may sense the second slider 230. Further, the number of the first position sensors is two, and the two first position sensors are respectively arranged at the starting point and the end point of the sliding path of the second slider 230, so that the ascending and descending of the lifting platform can be controlled. The starting point and the end point of the sliding path of the second slider 230 can be freely set according to the actual situation, and can be flexibly adjusted according to the length of the screw rod 520, the length of the second slide rail 220 and the lifting amplitude of the lifting platform, and similarly, the distance between the two proximity switches 530 can also be correspondingly set according to the actual situation.
The working principle of the lifting platform in this embodiment will be described in detail below. Independently, extension and retraction of the hydraulic cylinder 400, or rotation of the motor 510, causes the scissors mechanism 300 to move, thereby raising and lowering the top plate 110, but at the same time, the hydraulic cylinder 400 and the motor 510 are in a constrained relationship with each other. First, since the screw 520 and the nut 231 are self-locked, the second slider 230 cannot slide freely without the rotation of the motor 510, and therefore the extension and contraction of the hydraulic cylinder 400 cannot operate the scissors mechanism 300. Next, since the oil inlet/outlet passage of the hydraulic cylinder 400 also has a position holding function, if the oil inlet/outlet passage is closed by the hydraulic cylinder 400, the scissor mechanism 300 cannot be driven to operate even if the motor 510 rotates. Therefore, the lifting platform can be lifted more stably through the mutual restriction relationship among the hydraulic cylinder 400, the screw rod 520 and the nut 231, and the lifting platform has better position keeping degree.
In the present embodiment, the hydraulic cylinder 400 is used as a main driving force, and the motor 510, the lead screw 520 and the second slider 230 function as a position control in cooperation with a position sensor. When the top plate 110 needs to be lifted, the hydraulic cylinder 400 is extended, the motor 510 drives the second slider 230 to move leftwards through the screw rod 520, and the scissor fork mechanism 300 acts to lift the top plate 110. In this process, the hydraulic cylinder 400 provides a main driving force for lifting the top plate 110, and the motor 510, the lead screw 520 and the first position sensor serve to control the lifting speed and the lifting position of the top plate 110. To coordinate the speed of movement between hydraulic cylinder 400 and motor 510, motor 510 may be operated in a torque mode, where the idle speed of motor 510 is greater for the lifting speed of top plate 110 than for hydraulic cylinder 400, such that motor 510 automatically follows the movement of hydraulic cylinder 400. When the second slider 230 reaches the position of the proximity switch 530, the proximity switch 530 sends a stop signal, the motor 510 stops rotating, and the oil inlet and outlet paths of the hydraulic cylinder 400 are closed. Although the operation of the hydraulic cylinder 400 may be delayed, the position of the cylinder may be varied due to leakage of hydraulic oil. However, due to the quick stop of the motor 510 and the self-locking function among the motor 510, the lead screw 520 and the nut 231, the position of the top plate 110 is not affected by the hydraulic cylinder 400, so that the accurate positioning is realized and the position maintaining effect is better.
The distance between the two proximity switches 530 is the lifting amplitude of the top plate 110. Through setting up first actuating mechanism and second actuating mechanism, utilize first actuating mechanism to provide the power of scissors fork mechanism 300 action, utilize second actuating mechanism to fix a position scissors fork mechanism 300's position, the locking piece of cooperation second slider 230 makes scissors fork mechanism 300's position remain unchanged simultaneously to improve the precision that the lift platform height promoted effectively.
In addition, referring to fig. 2, the second embodiment of the present invention further provides a lifting platform, which is different from the first embodiment in that, in this embodiment, the second driving mechanism further includes a second position sensor for sensing the position of the second slider 230, so as to sense the real-time position of the second slider 230. As one of the preferable schemes, the second position sensor is a photoelectric encoder 540, which has strong anti-interference capability and high sensing precision, and mainly functions to convert the mechanical geometric displacement on the lead screw 520 into a pulse or a digital quantity through photoelectric conversion, thereby realizing the acquisition of the real-time position information of the second slider 230, and thus being capable of conveniently controlling the second slider 230 to stop at any position to meet the requirement of the lifting control of height change. In addition, other sensing devices with similar functions, such as magnetic encoders, etc., may also be used.
Specifically, referring to fig. 3, the height control signal of the scissors mechanism 300 is provided by detecting the horizontal movement position of the second slider 230. Wherein the height signal is determined by the following formula;
Y=Lsinα (1)
in the formula (1), Y is a projection of the scissors mechanism 300 in the vertical direction, L is an arm length of the first body 310, and α is a horizontal angle between the first body 310 and the bottom plate 210, which can be determined by the following formula:
Figure BDA0002250216790000091
in the formula (2), X is the horizontal projection of the scissors mechanism 300, and L is the arm length of the first body 310.
Since the arm length L of the first body 310 is known, the projection Y of the scissors mechanism 300 in the vertical direction can be calculated by the above equations (1) and (2) as long as X is measured.
In the present embodiment, the position of the proximity switch 530 is adjusted as the lowest position limit signal of the top plate 110 and is also the origin signal of the photoelectric encoder 540. The position of the proximity switch 530 is adjusted as the highest position limit signal of the top plate 110.
In this embodiment, the motor 510 can provide a certain auxiliary force to the lifting platform in the torque mode, and the magnitude of the auxiliary force depends on the magnitude of the torque output by the motor 510. Preferably, the motor 510 is not used for providing the lifting force of the top plate 110, and the torque of the motor 510 only needs to overcome the rotational friction torque between the screw rod 520 and the nut 231, so that the power of the motor 510 can be small. Preferably, the motor 510 can also be used only for precise control and position maintenance of the position of the top plate 110.
It should be added that, in the above two embodiments, an industrial control system in the prior art may be adopted to receive signals of the proximity switch 530, the photoelectric encoder 540, and the like, so as to control the hydraulic cylinder 400 or the motor 510 to operate, for example, a PLC system in the prior art, and the principle thereof is not described herein again.
While the preferred embodiments of the present invention have been described, the present invention is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are intended to be included within the scope of the present invention defined by the appended claims.

Claims (9)

1. A lift platform, comprising:
the supporting mechanism comprises a top plate and a bottom plate; a first sliding rail is arranged on the top plate, and a first sliding block is arranged on the first sliding rail; a second sliding rail is arranged on the bottom plate;
the shearing fork mechanism is provided with a first hinged end, a second hinged end, a third hinged end and a fourth hinged end, the first hinged end is hinged to the top plate, the second hinged end is hinged to the first sliding block, and the third hinged end is hinged to the bottom plate;
the first driving mechanism is used for providing lifting power and is respectively hinged with the scissor mechanism and the bottom plate;
the second driving mechanism is used for positioning the position of the scissor fork mechanism, the second driving mechanism is provided with a second sliding block, a locking piece used for locking the position is arranged on the second sliding block, and the fourth hinged end is hinged to the second sliding block.
2. A lifting platform according to claim 1, wherein: the first driving mechanism is a hydraulic cylinder.
3. A lifting platform according to claim 1, wherein: the second driving mechanism comprises a motor and a screw rod.
4. A lifting platform according to claim 3, wherein: the locking piece is a nut.
5. A lifting platform according to claim 1, wherein: the first position sensor is used for sensing the position of the second sliding block and arranged on the bottom plate.
6. A lifting platform according to claim 5, characterised in that: the first position sensor is a proximity switch.
7. A lifting platform according to claim 5, characterised in that: the number of the first position sensors is two, and the first position sensors are respectively arranged at the starting point and the end point of the sliding path of the second sliding block.
8. A lifting platform according to any one of claims 1 to 7, characterised in that: the second driving mechanism further comprises a second position sensor for sensing the position of the second slider.
9. A lifting platform according to claim 8, wherein: the second position sensor is a photoelectric encoder.
CN201921826244.XU 2019-10-28 2019-10-28 Lifting platform Active CN211226181U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201921826244.XU CN211226181U (en) 2019-10-28 2019-10-28 Lifting platform

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201921826244.XU CN211226181U (en) 2019-10-28 2019-10-28 Lifting platform

Publications (1)

Publication Number Publication Date
CN211226181U true CN211226181U (en) 2020-08-11

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Application Number Title Priority Date Filing Date
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CN (1) CN211226181U (en)

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