Positioning device for upper cross beam assembly of middle portal frame

Abstract

The utility model discloses a positioning device for an upper cross beam assembly of a middle portal frame, which comprises a positioning front plate and a positioning rear plate which are oppositely arranged, the positioning front plate and the positioning rear plate are connected through a connecting plate, and a chain wheel seat positioning plate is mounted on the connecting plate; a positioning pin is arranged on the positioning front plate, and an auxiliary positioning plate is fixedly arranged on the rear side wall of the positioning rear plate. According to the positioning device, the upper cross beam, the oil cylinder base, the chain wheel base and the pulley supporting plate of the upper cross beam assembly are positioned at a time, and the positioning and mounting efficiency is greatly improved. And assembly can be completed by a single person at a time without scribing in the whole process.

Description

Technical Field

[0001] The utility model relates to the technical field of forklifts, in particular to a positioning device for a crossbeam assembly on a middle door frame. Background Art

[0002] The forklift mast is the main load-bearing structure of the forklift pickup device, which is composed of a mast, a fork frame, a fork, a sprocket, a chain, a lifting cylinder, and a tilting cylinder. The mast structure includes a two-stage mast and a three-stage mast. The two-stage mast is a two-stage telescopic device composed of an outer mast and an inner mast. The inner mast has rollers embedded in the outer mast, and the fork frame has rollers embedded in the inner mast and can move up and down. The bottom of the lifting cylinder is fixed to the lower part of the outer mast, and the piston rod of the lifting cylinder moves up and down along the guide rod on the inner mast. A sprocket is installed on the top of the piston rod, and the sprocket is installed on the sprocket seat fixed on the outer mast. One end of the lifting chain is fixed on the outer mast, and the other end bypasses the sprocket and is connected to the fork frame. When the top of the piston rod lifts with the sprocket, the chain lifts the fork and the fork frame together.

[0003] The three-stage mast is a three-stage telescopic device consisting of an outer mast, a middle mast, and an inner mast. The fork frame moves along the inner mast, the inner mast moves along the middle mast, and the middle mast moves along the outer mast, thereby achieving the lifting and loading and unloading of goods. An upper crossbeam assembly is installed at one end of the middle mast, which includes an upper crossbeam installed at the ends of two channel steels, and a cylinder seat and a sprocket seat symmetrically installed on the two channel steels. A pair of pulley support plates are also installed obliquely on one side of the upper crossbeam. Figure 1 When assembling these parts with the channel steel, it is necessary to find the respective welding positions. At present, the fixing positions are generally found by rulers and marking. However, due to the large number of parts, marking positioning leads to low work efficiency, and the positioning accuracy cannot be guaranteed due to the inclination angle, the distance between the parts, etc., which will affect the overall working performance of the forklift mast. Utility Model Content

[0004] In order to solve the above existing problems, the utility model provides a positioning device for a crossbeam assembly on a middle door frame.

[0005] The technical solution of the utility model is as follows:

[0006] A positioning device for a crossbeam assembly on a middle door frame comprises a positioning front plate and a positioning rear plate which are arranged opposite to each other. The positioning front plate and the positioning rear plate are connected by a connecting plate, and a sprocket seat positioning plate is installed on the connecting plate. The positioning front plate is provided with a positioning pin, and an auxiliary positioning plate is fixedly provided on the rear side wall of the positioning rear plate.

[0007] According to a further solution, a centering keyway is provided at a line connecting the center axes of the bottom end surfaces of the positioning front plate and the positioning rear plate.

[0008] According to a further solution, the positioning rear plate includes a fixed rear transverse plate and a rear bottom plate, both ends of the rear transverse plate are respectively provided with concave positioning surfaces, the auxiliary positioning plate is fixed to the outer side wall of the concave positioning surface, and the top end surfaces of the auxiliary positioning plate and the concave positioning surface are located on the same horizontal plane; a weight reduction hole is provided in the middle of the rear bottom plate.

[0009] In a further solution, the positioning front plate includes a fixed front cross plate and a front bottom plate, the front cross plate is provided with pin holes spaced apart along its length direction, and a weight reduction hole is provided in the middle of the front bottom plate.

[0010] In a further solution, the connecting plates are two and are fixed in parallel between the positioning front plate and the positioning rear plate, and the sprocket seat positioning plates are two and are symmetrically and vertically fixed on the two connecting plates.

[0011] The positioning device can realize one-time positioning of the upper beam, cylinder seat, sprocket seat and pulley support plate of the upper beam assembly, greatly improving the efficiency of positioning and installation. In addition, the whole process can be completed by one person at one time without marking.

[0012] The positioning device is adaptively designed for the middle door frame and the upper crossbeam assembly thereon, and has high positioning accuracy for each component in the upper crossbeam assembly, which can reach 0.2mm.

[0013] The centering base and height support surface of the positioning device are combined with the existing mold platform. The positioning device is positioned based on the table top and centering key of the mold platform. The centering key slot at the lower end of the positioning device is used for centering positioning, thereby ensuring that the centering reference of the upper beam assembly and the centering reference of the gantry are consistent. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the upper crossbeam assembly on the middle door frame.

[0015] Figure 2 This is a schematic diagram of the structure of the positioning device of the utility model.

[0016] Figure 3 This is a schematic diagram of the structure of the positioning front plate in the utility model.

[0017] Figure 4 This is a schematic diagram of the structure of the positioning rear plate in the utility model.

[0018] Figure 5 The figure is a schematic diagram of the upper beam assembly assembled with the positioning device of the utility model.

[0019] In the figure: 1-middle door frame, 11-channel steel, 12-cylinder seat, 13-sprocket seat, 14-pulley support plate, 15-upper crossbeam;

[0020] 2-positioning device, 21-positioning front plate, 221-front transverse plate, 212-front bottom plate, 213-pin shaft hole; 22-positioning rear plate, 221-rear transverse plate, 222-rear bottom plate, 223-concave positioning surface, 224-weight reduction hole; 23-connecting plate, 24-auxiliary positioning plate, 25-sprocket seat positioning plate, 26-positioning pin, 27-centering keyway. DETAILED DESCRIPTION

[0021] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] The installation diagram of the crossbeam assembly on the middle door frame is as follows: Figure 1 As shown, it includes an upper crossbeam 15 installed at the ends of two channel steels 11 of the middle door frame, and a cylinder seat 12 and a sprocket seat 13 symmetrically installed on the two channel steels 11. A pair of pulley support plates 14 are obliquely installed on the inner side wall of the upper crossbeam 15.

[0023] See also Figure 2-4 The utility model provides a positioning device for a crossbeam assembly on a middle door frame, comprising a positioning front plate 21 and a positioning rear plate 22 arranged opposite to each other, wherein the positioning front plate 21 and the positioning rear plate 22 are connected by a connecting plate 23, and a sprocket seat positioning plate 25 is installed on the connecting plate 23; a positioning pin 26 is provided on the positioning front plate 21, and an auxiliary positioning plate 24 is fixedly provided on the rear side wall of the positioning rear plate 22.

[0024] In this embodiment, the lengths of the front positioning plate 21 and the rear positioning plate 22 just match the spacing between the two channel steels 11. The positioning device is placed on the mold platform, and the connecting plate 23 is placed between the two channel steels 11. Its end is fitted with the upper cross beam 15 to determine the position. Then, the positioning pins 26 are used to position the cylinder seat 12 corresponding to the holes on the cylinder seat, the auxiliary positioning plate 24 is used to position the pulley support plate 14, and the sprocket seat positioning plate 25 is used to position the sprocket seat 13.

[0025] like Figure 4 As shown, the positioning rear plate 22 includes a fixed rear transverse plate 221 and a rear bottom plate 222, and concave positioning surfaces 223 are respectively provided at both ends of the rear transverse plate 221, and the auxiliary positioning plate 24 is fixed to the outer wall of the concave positioning surface 223, and the top end surfaces of the auxiliary positioning plate 24 and the concave positioning surface 223 are located on the same horizontal plane; a weight reduction hole 224 is provided in the middle of the rear bottom plate 222.

[0026] A concave positioning surface 223 is provided on the top surface of the rear horizontal plate 221, and the top surface of the concave positioning surface 223 is inclined. Thus, the step on one side of the concave positioning surface 223 forms a barrier to the pulley support plate 14 to achieve the purpose of limiting the position. At the same time, an auxiliary positioning plate 24 is fixed to the outer side wall of the concave positioning surface 223, and the top surfaces of the two are located on the same horizontal plane, and are used to position the pulley support plate 14 at the same time. That is, the positioning area of ​​the pulley support plate is increased, the stability is increased, and at the same time, the rear side wall of the auxiliary positioning plate 24 limits the upper cross beam 15.

[0027] When positioning the pulley support plate 14, the pulley support plate 14 is placed on the concave positioning surface 223 and the top surface of the auxiliary positioning plate 24, and one side wall is limited by the rear cross plate 221 and the rear end is limited by the upper cross beam 15, thereby achieving the positioning of the pulley support plate 14.

[0028] In addition, a centering keyway 27 is provided at the bottom end of the rear bottom plate 222 for centering positioning on the mold platform, and a centering keyway 27 is provided at the connecting line of the center axis of the bottom end surfaces of the positioning front plate 21 and the positioning rear plate 22. At the same time, a weight-reducing hole 224 is also processed on the rear bottom plate 222 for weight reduction.

[0029] like Figure 3 As shown, the positioning front plate 21 includes a fixed front transverse plate 211 and a front bottom plate 212 . The front transverse plate 211 is provided with pin holes 213 spaced apart along its length direction, and a weight-reducing hole is provided in the middle of the front bottom plate 212 .

[0030] A pin hole 213 is machined on the front horizontal plate 211 for positioning the front plate 21. The center line distance of the pin holes 213 at both ends needs to be equal to the center distance of the holes on the cylinder seat 12 fixed on the channel steel 11. The pin 26 is passed through the pin hole 213 and connected to the hole on the cylinder seat 12 to achieve positioning of the cylinder seat 12. A centering keyway 27 is opened at the bottom end of the front bottom plate 212 for centering positioning on the mold platform, and a weight reduction hole is also machined to reduce weight.

[0031] In a further embodiment, the connecting plates 23 are two parallel fixed between the positioning front plate 21 and the positioning rear plate 22, and the sprocket seat positioning plates 25 are two symmetrically and vertically fixed on the two connecting plates 23. The length of the sprocket seat positioning plate 25 is designed according to actual conditions, so that its outer end just abuts against the outer side wall of the sprocket seat 13, and the shape of its outer end is consistent with the shape of the outer side wall of the sprocket seat 13.

[0032] The positioning process of this device is as follows:

[0033] The middle door frame 1 to be installed and the positioning device 2 of this embodiment are placed on the platform of the door frame assembly mold platform (not shown in the figure), the positioning device 2 is placed between the two channel steels 11 through the connecting plate 23, and is matched and connected with the centering key of the mold platform and the centering key groove 27 under the positioning device to complete the height and left and right direction positioning of the positioning device 2.

[0034] Take the upper cross beam 15 and make it fit with the end surface of the channel steel, then move the positioning device 2 in the front-to-back direction so that the auxiliary positioning plate 24 fits with the upper cross beam 15, that is, the positioning device 2 is positioned in the front-to-back direction;

[0035] Then, the pulley support plate 14 is placed on the concave positioning surface 223 on the positioning device 2 and the top surface of the auxiliary positioning plate 24, and one side of the pulley support plate 14 is abutted against the step surface of the positioning rear plate 22, and the rear end surface is fitted with the upper cross beam 15, so as to complete the positioning of the pulley support plate 14;

[0036] The sprocket seat 13 is placed on the channel steel, and its front-to-back direction is in contact with the upper crossbeam 15, and the inner side is abutted by the sprocket seat positioning plate 25 to complete the positioning of the left and right opening direction;

[0037] Then take the oil cylinder seat 12 and place it on the channel steel, insert the positioning pin 26 into the pin hole 213 on the positioning front plate 21, connect the positioning pin 26 with the hole on the oil cylinder seat 12, and complete its positioning. At this point, the positioning of the upper crossbeam assembly is completed (such as Figure 5 Then, the components can be welded.

[0038] Although this specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0039] Therefore, the above description is only a preferred embodiment of the present application and is not intended to limit the scope of implementation of the present application; that is, all equivalent changes made according to the scope of the claims of the present application are within the protection scope of the claims of the present application.

Claims

1. A positioning device for a crossbeam assembly on a middle door frame, characterized in that: The invention comprises a positioning front plate (21) and a positioning rear plate (22) which are arranged opposite to each other. The positioning front plate (21) and the positioning rear plate (22) are connected via a connecting plate (23), and a sprocket seat positioning plate (25) is installed on the connecting plate (23); a positioning pin (26) is provided on the positioning front plate (21), and an auxiliary positioning plate (24) is fixedly provided on the rear side wall of the positioning rear plate (22).

2. The positioning device according to claim 1, characterized in that: A centering keyway (27) is provided at the connecting line of the center axes of the bottom end surfaces of the positioning front plate (21) and the positioning rear plate (22).

3. The positioning device according to claim 1, characterized in that: The positioning rear plate (22) comprises a fixed rear transverse plate (221) and a rear bottom plate (222); both ends of the rear transverse plate (221) are respectively provided with concave positioning surfaces (223); the auxiliary positioning plate (24) is fixed to the outer side wall of the concave positioning surface (223); and the top ends of the auxiliary positioning plate (24) and the concave positioning surface (223) are located on the same horizontal plane; and a weight reduction hole (224) is provided in the middle of the rear bottom plate (222).

4. The positioning device according to claim 1, characterized in that: The positioning front plate (21) comprises a fixed front transverse plate (211) and a front bottom plate (212); the front transverse plate (211) is provided with pin holes (213) spaced apart along its length direction; and a weight-reducing hole is provided in the middle of the front bottom plate (212).

5. The positioning device according to claim 1, characterized in that: The connecting plates (23) are two and are fixed in parallel between the positioning front plate (21) and the positioning rear plate (22); the sprocket seat positioning plates (25) are two and are symmetrically and vertically fixed on the two connecting plates (23).

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