Portal assembly tool for bus escalator

Abstract

The present application relates to a kind of escalator portal assembly tool field.A kind of bus escalator portal assembly tool, including portal car, upper head lifting appliance, truss and lower head lifting appliance, also include mutually parallel 3D trolley guide rail, transfer trolley guide rail and portal frame guide rail, truss propulsion trolley is equipped with height difference between 3D trolley;According to the length of truss, adopt two different process routes of truss lifting in and out and truss propulsion in and out;Hydraulic centering device is equipped on upper head lifting appliance, the hydraulic centering device includes hydraulic pump, and hydraulic pump is connected with two symmetrically arranged centering jack.The present application provides a kind of suitable installation process for different length truss, improves assembly efficiency, improves the precision of assembly simultaneously, and the portal assembly tool of good assembly centering is assembled;Solve the technical problems of only one installation process can be used in prior art, assembly efficiency is not enough, and assembly precision is not high.

Description

Technical Field

[0001] This invention relates to the field of escalator gantry assembly fixtures, and more particularly to a gantry assembly fixture for a public transport escalator. Background Technology

[0002] Bus escalators are large-scale infrastructure used in public places such as subway stations and pedestrian overpasses. They should have characteristics such as high load capacity, high strength, long travel distance, and high reliability. However, in the past, the production and manufacturing of bus escalators were carried out without large tooling. The centering in the X and Y directions was done manually with a measuring tape, and the Z direction was leveled by visual level. The accuracy of the measuring tape and level was only about 1mm at most. This resulted in low manufacturing process standards, serious lateral load imbalance after assembly, and high operating noise and failure rate.

[0003] Currently, escalators can be assembled using gantry-type fixtures, but most current assembly methods can only use one process, such as hoisting the truss onto the 3D car. However, since escalator trusses vary in length, hoisting is not suitable for very long trusses, as it is time-consuming, labor-intensive, and unsafe. Summary of the Invention

[0004] This invention provides a gantry assembly fixture that allows for the selection of appropriate installation processes for trusses of different lengths, improving assembly efficiency and accuracy, and ensuring good alignment. It solves the technical problems of existing technologies that can only use one installation process, resulting in insufficient assembly efficiency and low assembly accuracy.

[0005] The above-mentioned technical problem of the present invention is solved by the following technical solution: a gantry assembly fixture for a bus escalator, comprising a gantry car, an upper head lifting device, a lower head lifting device, two 3D trolleys, a pit lifting platform, and a truss transfer trolley, and further comprising...

[0006] 3D trolley guide rail: for the movement of the 3D trolley, the 3D trolley is located below the truss, and the position of the truss in the X, Y and Z directions can be adjusted;

[0007] Truss propulsion trolley guide rail: provides a guide rail for the movement of the truss propulsion trolley, pushing or pushing the truss onto the 3D trolley;

[0008] Gantry rails: for the movement of the gantry crane, and can be used to install upper and lower lifting devices;

[0009] The 3D trolley guide rail, the transfer trolley guide rail and the gantry guide rail are parallel to each other and have different widths. The 3D trolley has a lifting device that can pass under the truss transfer trolley; it can also lift the truss to separate the transfer trolley from the truss.

[0010] The pit lifting platform can lower the upper part of the truss into the pit, making the middle section of the ladder horizontal; the wall panel support seats on both sides of the pit lifting platform can be used to position and install the upper lifting device.

[0011] Depending on the length of the truss, two different process routes can be selected: truss hoisting in and out or truss pushing out.

[0012] A hydraulic centering device is provided on the upper lifting device. The hydraulic centering device includes a manual hydraulic sub-pump, which is connected to two symmetrically arranged centering jacks.

[0013] Based on the original two pairs of four ground rails, an additional pair of two ground rails was added to support the movement of two truss transfer trolleys, bringing the total to six ground rails. This allows for both truss hoisting in and out assembly processes (suitable for shorter truss sections) and truss pushing out assembly processes (suitable for longer truss sections), creating alternating or rotating process routes that make the production layout more efficient and rational.

[0014] When using the push-pull process route, the truss is first pushed forward using a truss push-up trolley. The 3D trolley can then lower its height and pass under the truss push-up trolley to reach the appropriate position. The truss is then lifted up, allowing it to transition from the push-up trolley to the 3D trolley. The 3D trolley then adjusts the X, Y, and Z positions of the truss based on feedback data.

[0015] A hydraulic centering device is added to the clamps of the upper lifting fixture. Using a two-pronged hydraulic pump, two hydraulic cylinders simultaneously push out and press against the inner sides of a pair of sprockets, causing the sprocket shafts to move axially and achieve centering. This significantly improves the assembly accuracy and production efficiency of the upper and lower ends of the truss.

[0016] Preferably, the upper head lifting device has upper head lifting device support walls on both sides, and a positioning structure is provided between the upper head lifting device and the upper head lifting device support walls; the lower head lifting device has lower head lifting device support walls on both sides, and a positioning structure is provided between the lower head lifting device and the lower head lifting device support walls.

[0017] Preferably, the positioning structure includes V-shaped support feet mounted on the lifting device and support columns mounted on the wall. Each V-shaped support foot includes a support base with an inclined positioning surface on one side and a guide cone surface on the side of the support column, the guide cone surface engaging with the positioning surface. Each V-shaped support foot further incorporates an inner wedge-shaped conical surface, improving the alignment of the four wedge-shaped conical surfaces with the lifting device's centerline and enhancing the self-centering effect of the lifting device.

[0018] Preferably, the upper lifting device is equipped with a worm gear hoist with a high reduction ratio. For the upper main drive axle, which weighs up to 3.5 tons, the application of a worm gear hoist with a high reduction ratio as the power source for the lifting device to grasp the carrier solves the problem of insufficient grasping force.

[0019] Preferably, the 3D trolley includes an upper 3D trolley and a lower 3D trolley. An X-direction laser rangefinder, a Y-direction laser rangefinder, and a Z-direction laser rangefinder are installed on the upper head support wall. Since the escalator truss is relatively long, generally between 15 and 30 meters, this invention specifically installs nine laser rangefinders at different locations: four laser rangefinders are installed on each side of the truss in the X-direction to detect the position of the head and tail of the truss in the X-direction; four rangefinders are installed above the plane of the upper chord of the truss to detect the height of the upper chord tube, measuring the horizontal height of the truss in the Z-direction; and one laser rangefinder is installed in the longitudinal Y-direction to detect the position of the truss in the Y-direction.

[0020] By installing three servo motors and precision reducers on each of the two 3D trolleys, and in conjunction with a PLC control system, a closed-loop control system was established that can automatically measure, center, level, and clamp the escalator truss in the X, Y, and Z directions.

[0021] Therefore, the gantry assembly fixture for a bus escalator of the present invention has the following advantages: 1) It has the capability of two process routes. Based on the original two pairs of four ground rails, an additional pair of two ground rails that can support the movement of two truss trolleys is added. When the length of the middle section of the truss is different, two different process routes can be adopted: truss hoisting in and out and truss pushing out. This provides more options for truss assembly production, so that the process routes can be alternated or rotated according to the actual situation, making the production layout more efficient and reasonable.

[0022] 2) Add a hydraulic centering device to the clamps of the upper lifting fixture. Using a two-cylinder hydraulic pump, two hydraulic cylinders simultaneously push out and press against the inner sides of a pair of sprockets, causing the sprocket shafts to move axially and achieve centering. This significantly improves the assembly accuracy and production efficiency of the upper and lower ends of the truss.

[0023] 3) Two 3D vehicle-mounted fixtures were added to the upper and lower parts of the bus escalator manufacturing process. Each 3D vehicle-mounted fixture is equipped with 3 servo motors and a precision reducer. Together with 4 laser rangefinders in the X direction, 4 laser rangefinders in the Y direction, and 1 laser rangefinder in the Z direction, and in conjunction with the PLC control system, a closed-loop control system was established to enable the bus escalator to automatically center, level, clamp, and adjust its longitudinal position in the X, Y, and Z directions.

[0024] 4) Self-aligning and self-centering structure of the spreader support legs. Each of the spreader support legs has an additional wedge-shaped conical surface added to the V-shaped structure, which improves the guiding properties of the four wedge-shaped conical surfaces and the alignment of the spreader's centerline, thus enhancing the spreader's self-centering effect.

[0025] 5) Increased clamping force of the lifting device. A special lifting device was developed for the main drive axle of the upper head, which weighs up to 3 tons. A worm gear hoist with a large reduction ratio was used as the power source for the lifting device to grab the carrier, which solved the problem of insufficient clamping force of the previous lifting devices. Attached Figure Description

[0026] Figure 1 This is a perspective view of a gantry assembly fixture for a bus escalator according to the present invention.

[0027] Figure 2 yes Figure 1 A three-dimensional view from another direction inside.

[0028] Figure 3 yes Figure 1 A three-dimensional diagram from another direction.

[0029] Figure 4 yes Figure 3 Enlarged view of point C.

[0030] Figure 5 yes Figure 3 Enlarged view of point D.

[0031] Figure 6 yes Figure 3 A magnified view of point E.

[0032] Figure 7 yes Figure 2 Enlarged view of point A inside.

[0033] Figure 8 yes Figure 7 A sectional view.

[0034] Figure 9 yes Figure 2 Enlarged view of section B.

[0035] Figure 10 These are enlarged views of the 3D car and the truss propulsion car. Detailed Implementation

[0036] The technical solution of the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0037] Example:

[0038] like Figure 1 and 2As shown, a gantry assembly fixture for a bus escalator includes six parallel tracks, including two gantry guide rails 2 for the movement of the gantry trolley, two 3D trolley guide rails 3 for the movement of the 3D trolley, and two truss propulsion trolley guide rails 1 for the movement of the truss propulsion trolley.

[0039] The truss has an upper head and a lower head at both ends. The upper head has upper head lifting support walls 7 on both sides, and the lower head has lower head lifting support walls 5 on both sides. The upper and lower heads are hoisted using upper head lifting devices 8, and the lower head is hoisted using lower head lifting devices 9. Different installation methods are selected depending on the length of the truss. If the truss 6 is short, it can be directly hoisted onto the 3D trolley 21. If the truss is long, it is pushed over using the truss pushing trolley 0, and then the truss position is adjusted using the 3D trolley. The 3D trolley 21 can pass under the truss pushing trolley. The 3D trolley 21 can adjust its height via the Z-axis trolley guide rail 22, allowing it to be flexibly pushed and pushed out by the truss pushing trolley 20 (e.g., ...). Figure 10 (As shown).

[0040] like Figure 3 and 4 As shown in Figures 5 and 6, an X-axis laser rangefinder 30 and a Y-axis laser rangefinder 31 are installed on the supporting walls of the upper and lower head hangers 8 and 8, respectively. Both the X-axis and Y-axis laser rangefinders 30 and 31 are Keyence laser rangefinders. The X-axis laser rangefinder directly projects light onto the side of the truss for measurement. Due to the long upper and lower heads of the truss, there is always significant welding deformation (i.e., torsional deformation and poor alignment) in the upper, lower, inclined sections and the middle section of the truss during the welding process. Therefore, we changed the laser rangefinder measurement method to adjusting the height of the 3D trolley in the Z direction by scanning the laser generator 32 with the laser alignment block 33 placed on the inclined section. The collected data is transmitted to the PLC control system. Servo motors and reducers are installed on the 3D trolley to adjust the position of the truss according to the instructions of the PLC control system, thereby ensuring the accuracy of the truss position.

[0041] like Figure 7 and 8 As shown, a positioning structure is provided between the upper head lifting device 8 and the upper head lifting device supporting wall 7; a positioning structure is also provided between the lower head lifting device 9 and the lower head lifting device supporting wall 5. The positioning structure includes a V-shaped support foot 15 set on the lifting device, and a support column set on the wall. The V-shaped support foot includes a support foot body, an inclined positioning surface is provided on one side of the support foot body, and a guide cone surface 17 is provided on the side of the support column 16, the guide cone surface cooperating with the positioning surface.

[0042] like Figure 9As shown, a worm gear hoist 13 with a large reduction ratio is installed on the mounting platform of the upper head lifting device 8. At the same time, a hydraulic centering device 14 is also installed on the mounting platform. The hydraulic centering device 14 is connected to two symmetrically arranged left hydraulic ejector shafts 11 and right hydraulic ejector shafts 12. The ejector shafts push the drive sprockets 10 on the side to move axially, so as to achieve the purpose of centering.

[0043] When the middle section of the truss is relatively long, such as 25 meters, the production steps for assembling a bus escalator using a gantry fixture are as follows: 1. Input the truss model and specifications into the gantry fixture's control computer; 2. The lower gantry trolley 4, upper 3D trolley, and lower 3D trolley move to appropriate positions respectively; 3. The truss is pushed into the gantry fixture by the truss pusher trolley, stopping the truss pusher trolley in the middle of the pit platform; 4. The upper and lower 3D trolleys pass through the truss pusher trolley 20 and stop at appropriate positions; 5. The pit platform begins to descend, and the upper truss and truss pusher trolley... 6. The 3D trolley slowly sinks into the pit, with the truss horizontal; 7. The 3D trolley raises the overhead truss and pushes the trolley. The 3D trolley receives instructions from the PLC control system to adjust the Z-axis of the truss, and then centers the Y-axis of the truss; then the X-axis of the truss is adjusted; 8. The pre-installed upper and lower lifting devices are hoisted in; 9. The guide rail pairs and various ladder components are installed; 10. The upper and lower lifting devices are hoisted out; 11. The truss and 3D trolley are released from their locking mechanisms, allowing the truss to be pressed back onto the truss pushing trolley; 12. The pit platform rises to the ground, and the truss exits the gantry fixture.

[0044] The specific embodiments described herein are merely illustrative of the concept of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A gantry assembly fixture for a bus escalator, comprising a gantry trolley, a 3D trolley, an upper head lifting device, a lower head lifting device, a pit lifting platform, and a truss transfer trolley, characterized in that: Also includes 3D trolley guide rail: for the movement of the 3D trolley, the 3D trolley is located below the truss, and the position of the truss in the X, Y and Z directions can be adjusted; Truss transfer trolley guide rail: provides movement for the truss transfer trolley, allowing the truss to be pushed forward or pushed out of the 3D trolley; Gantry crane guide rail: for the movement of the gantry crane; the upper wall panel support seat of the gantry crane can be used to position and install the lower head lifting device. The 3D trolley guide rail, the transfer trolley guide rail, and the gantry guide rail are parallel to each other and have different widths. The 3D trolley has a lifting device that can pass under the truss transfer trolley; it can also lift the truss to separate the transfer trolley from the truss. The pit lifting platform can lower the upper part of the truss into the pit, making the middle section of the ladder horizontal; the wall panel support seats on both sides of the pit lifting platform can be used to position and install the upper lifting device. Depending on the lifting height of the escalator truss, two different process routes can be selected: truss hoisting in and out or truss pushing out. A hydraulic centering device is provided on the upper head lifting device. The hydraulic centering device includes a manual hydraulic sub-pump, which is connected to two symmetrically arranged centering jacks. The aforementioned pit lifting platform is provided with upper head lifting device support walls on both sides, and a positioning structure is provided between the upper head lifting device and the upper head lifting device support wall; the aforementioned gantry car is provided with lower head lifting device support walls, and a positioning structure is provided between the lower head lifting device and the lower head lifting device support wall. The positioning structure includes a V-shaped support foot mounted on the lifting device and a support column mounted on the wall. The V-shaped support foot includes a support foot body with an inclined, recessed inner conical positioning surface on one side and a protruding outer conical guide cone surface on the side of the support column. The guide cone surface and the V-shaped positioning surface cooperate to achieve self-centering positioning of the lifting device in the X and Y directions.

2. The gantry assembly fixture for a bus escalator according to claim 1, characterized in that: The aforementioned upper head lifting device is specially equipped with a worm gear hoist with a large reduction ratio to address the excessive weight of the main drive wheel and axle at the top of the bus escalator.

3. The gantry assembly fixture for a bus escalator according to claim 1 or 2, characterized in that: The 3D trolley includes an upper 3D trolley and a lower 3D trolley, both of which have the ability to achieve controllable servo motor movement in the X, Y, and Z directions. The movement of the upper and lower 3D trolleys in the lateral X direction is controlled by X-direction laser rangefinders mounted on the upper head lifting device support wall and the gantry support wall, respectively, which illuminate the outer side of the truss. The movement of the 3D trolley in the Y direction is controlled by a laser rangefinder mounted on the ground. The movement in the Z direction is controlled by a laser rangefinder illuminating the upper chord surface of the truss.

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