Electric material handling machine with enhanced safety

Abstract

The present invention relates to an electric material carrier used to transport various items in industrial sites, wherein when items are loaded onto a loading plate attached to a lifting body and moving up and down together with the lifting body, if an unexpected obstacle intervenes beneath the descending loading plate and the plate comes into contact with the obstacle, the descent of the loading plate stops even with the rotation of the drive shaft, thereby preventing the loading plate from getting stuck underneath and ensuring the user's safety.

Description

Technology Field

[0001] The present invention relates to an electric material carrier used to transport various items in industrial sites. When an item is loaded onto a loading plate attached to a lifting body and moves up and down together with the lifting body, if an unexpected obstacle intervenes beneath the descending loading plate and contacts the plate, the descent of the loading plate is stopped even with the rotation of the drive shaft, thereby preventing the loading plate from getting stuck and stopping the progression of the accident, thus preventing the occurrence of safety accidents and protecting the user's safety. More specifically, the invention comprises installing a pair of guide posts at a certain distance on the upper surface of a main body with casters attached to the grounding part, forming a lifting guide groove on the inner surface where the two guide posts face each other, installing a lifting body between the guide posts with guide rollers formed on both sides to be in contact with the lifting guide groove, attaching a loading plate that protrudes forward from the guide posts to the front of the lower part of the lifting body, forming a driven sprocket support on the lower surface of the central part of a horizontal connecting member connecting the upper parts of the two guide posts to install a driven sprocket, and installing a left-right rotating electric motor on the upper surface of the main body, protruding from the reduction part of the electric motor In a configuration in which a drive sprocket is coupled to a drive shaft and a drive chain is connected between the drive sprocket and the driven sprocket, with the upper and lower ends of the drive chain respectively connected to a drive chain connection formed on the lifting body, so that when the electric motor is rotated in forward and reverse directions, the drive chain can raise and lower the lifting body, thereby allowing goods to be placed on the loading plate of the lifting body for transport, an electric goods carrier is developed by interposing a unidirectional clutch bearing composed of a steel ball and a cam clutch between the drive shaft and the drive sprocket. This configuration ensures user safety by preventing accidents caused by the loading plate getting stuck under the plate, so that when goods are transported using the electric goods carrier, if an unexpected obstacle intervenes under the descending loading plate and resistance occurs, the descent of the loading plate stops even with the rotation of the drive shaft. Background Technology

[0003] Conventional electric cargo carriers raise and lower a lifting body installed between guide posts using a drive chain. Since the motor is driven in forward rotation when raising the body and in reverse rotation when lowering it to forcibly lift the body using the motor's power, there was a risk that if an object unexpectedly intervenes on the underside of the loading plate during the downward phase, the loading plate cannot be stopped immediately, making it impossible to prevent an accident from occurring where the object gets trapped under the descending loading plate. Prior art literature

[0005] Prior Art Utility Model Registration No. 20-0405941 The problem to be solved

[0006] The present invention was developed to resolve the above inconvenience. means of solving the problem

[0008] The safety-enhanced electric cargo carrier according to the present invention comprises a pair of guide posts installed side by side at a certain distance from left to right on the rear of the upper surface of a carrier body having casters attached to the ground portion, thereby forming a lifting guide groove on the inner surface where the two guide posts face each other, and connecting guide rollers on the outer surface of support plates formed on both sides of a plate body between the two guide posts to the lifting guide groove; a lifting body with a drive chain connection formed vertically is installed in the central portion of the two guide posts, and a loading plate is attached to the front of the lower portion of the lifting body; a horizontal connecting member with a driven sprocket support formed on the bottom surface is installed on the upper portion of the two guide posts to install a driven sprocket; a forward / reverse rotating motor equipped with a reduction gear is installed on the upper surface of the carrier body, and the drive shaft of the reduction gear is coupled to the drive sprocket; a drive chain is installed between the drive sprocket and the driven sprocket, the upper portion of the drive chain is connected to the upper drive chain connection portion of the central portion of the lifting body, and the lower portion of the drive chain is connected to the central portion of the lifting body An electric cargo carrier that is connected to a lower drive chain connection part, and has upper limit operating rods and lower limit operating rods protruding from the rear to the front formed at regular intervals on the plate body of the lifting body, and has upper limit switches and lower limit switches installed on the upper and lower sides of the guide support on the movement line to limit the vertical movement distance of the lifting body, wherein the interior of the drive sprocket comprises: an outer ring coupled to the drive sprocket by a key and a keyway; an inner ring provided at the center of the outer ring and coupled to the drive shaft by a key and a keyway; and between the outer ring and the inner ring, a plurality of unidirectional clutch bearings are installed, each comprising a cam case, a plurality of steel balls installed within the cam case, and a plurality of cam clutches installed on one side of the steel balls and supported by a ring-shaped coil spring, so as to transmit driving rotational force in one direction.

[0009] delete Effects of the invention

[0011] The present invention, as described above, allows the drive shaft of the motor to rotate in the forward direction when raising the elevator body, so that the cam clutch of the unidirectional clutch bearing engages the inner ring and the outer ring, and the forward rotation is transmitted to the drive sprocket to raise the elevator body upward, thereby enabling the upward movement of goods loaded on the loading plate. When lowering the elevator body, the drive shaft is rotated in the reverse direction, causing the drive shaft to rotate in the reverse direction, and the elevator body descends by receiving the weight of the goods loaded on the loading plate. At this stage, if an unexpected obstacle enters under the loading plate, the loading plate comes into contact with the obstacle, and the descent of the loading plate stops even with the rotation of the drive shaft. This prevents the accident from continuing to proceed with the obstacle getting stuck under the loading plate, thereby providing the advantage of protecting the safety of the user.

[0012] Therefore, it is possible to prevent accidental pinching that occurs unexpectedly during the lowering phase of the loading plate, which can be achieved through the function of a one-way clutch bearing, thereby ensuring safety. Additionally, by installing multiple bearings in the one-way clutch, it is possible to perform lifting operations more stably, and since a limit switch is provided to restrict the timing of the lifting body's ascent and descent, it is possible to secure a working area and obtain enhanced effects that improve workability. Brief explanation of the drawing

[0014] FIG. 1 is a front view of the present invention. FIG. 2 is a rear view of the present invention with the rear cover opened. FIG. 3 is a front view of the present invention. FIG. 4 is a side view of the present invention. FIG. 5(a) and FIG. 5(b) are perspective views showing the loading plate portion of the lifting body. FIG. 6 is a detailed view showing the configuration of the present invention. FIG. 7 is a perspective view of a drive sprocket equipped with a one-way clutch bearing. FIG. 8 is a perspective view of the sprocket of FIG. 7. FIG. 9 is an exploded perspective view of FIG. 8. FIG. 10(a) is a perspective view of a one-way clutch bearing, and FIG. 10(b) is a cross-sectional view of a one-way clutch bearing. FIG. 11(a) and FIG. 11(b) are example views of the drive sprocket portion. Specific details for implementing the invention

[0015] The present invention comprises installing a pair of guide posts (2)(2a) side by side at a certain distance from left to right on the rear of the upper surface of a carrier body (1) with a caster (1a) attached to the grounding portion, forming a lifting guide groove (2b) on the inner surface where the two guide posts face each other, and between the two guide posts (2)(2a), guide rollers (3c) are installed on the two support plates (3a)(3b) to connect to the lifting guide groove of the guide posts, and a lifting body (3) is installed with a drive chain connecting portion (3d)(3e) formed vertically in the central portion, and a loading plate (30) is attached to the lower front of the lifting body, and a horizontal connecting member is installed on the upper part of the two guide posts, and a driven sprocket support (2d) is installed on the lower surface of the horizontal connecting member (2c) to install a driven sprocket (5a), and a forward / reverse rotating motor (4) equipped with a reduction gear (4a) is installed on the upper surface (1b) of the carrier body (1). In an electric transporter, a drive sprocket (5) is installed on a drive shaft (4b) that exits from a reduction gear, and a drive chain (6) is installed between the drive sprocket (5) and the driven sprocket (5a), wherein the upper part (6a) of the drive chain is connected to an upper drive chain connection part (3d) formed in the center of the lifting body, and the lower part (6b) of the drive chain is connected to a lower drive chain connection part (3e) formed in the center of the lifting body.

[0016] The upper limit operating rod (3f) and the lower limit operating rod (3g) are formed at regular intervals on the plate body of the lifting body (3) and protrude from the rear to the front, and the upper limit switch (4c) and the lower limit switch (4d) are installed on the upper and lower sides of the guide support on the movement line so as to limit the vertical movement distance of the lifting body (3). Between the drive shaft (4b) and the drive sprocket (5), a cam case (72) is inserted between the inner ring (70) and the outer ring (71) to install a plurality of steel balls (73) and a plurality of cam clutches (74), and the cam clutches are supported by a ring-shaped coil spring (75) so as to enable unidirectional transmission of the driving rotational force, and a plurality of unidirectional clutch bearings (7) are installed.

[0017] At this time, the driving sprocket (5) and the driven sprocket (5a) can have grooves formed on the outer surface of the driving sprocket and the driven sprocket so that the timing belt (6') can be used. Explanation of the symbols

[0018] 1 : Carrier body 1a : Caster 1b : Top surface 2,2a : Guide post 2b : Lifting guide groove 2c : Horizontal connector 2d : Driven sprocket support 3 : Lifting body 3a,3b : Support plate 3c : Guide roller 3d,3e : Drive chain connection 3f : Upper limit operating rod 3g : Lower limit operating rod 4 : Forward / reverse rotation motor 4a : Reducer 4b : Drive shaft 4c : Upper limit switch 4d : Lower limit switch 5 : Drive sprocket 5a : Driven sprocket 6 : Drive chain 6' : Timing belt 6a : Upper part 6b : Lower part 7 : Unidirectional clutch bearing 30 : Loading plate 70 : Inner ring 71 : Outer ring 72 : Cam case 73 : Steel ball 74 : Cam clutch 75 : Ring-shaped coil spring

Claims

Claim 1 A pair of guide posts (2)(2a) are installed side by side at a certain distance from left to right on the rear of the upper surface of a carrier body (1) to which a caster (1a) is attached to the grounding portion, and a lifting guide groove (2b) is formed on the inner surface facing the two guide posts (2)(2a). A guide roller (3c) on the outer surface of a support plate (3a)(3b) formed on both sides of the plate body between the two guide posts (2)(2a) is connected to the lifting guide groove (2b). A lifting body (3) is installed with a drive chain connecting portion (3d)(3e) formed vertically in the center of the two guide posts (2)(2a), and a loading plate (30) is attached to the front of the lower part of the lifting body. A horizontal connecting member (2c) with a driven sprocket support (2d) formed on the bottom surface is installed on the upper part of the two guide posts (2)(2a) to install a driven sprocket (5a). The carrier body (1) A forward / reverse rotation motor (4) equipped with a reduction gear (4a) is installed on the upper surface (1b), and the drive shaft (4b) of the reduction gear (4a) is connected to the drive sprocket (5). A drive chain (6) is installed between the drive sprocket (5) and the driven sprocket (5a), so that the upper end (6a) of the drive chain (6) is connected to the upper drive chain connection part (3d) in the center of the lifting body (3), and the lower end (6b) of the drive chain (6) is connected to the lower drive chain connection part (3e) in the center of the lifting body (3). On the plate body of the lifting body (3), an upper limit operating rod (3f) and a lower limit operating rod (3g) protruding from the rear to the front are formed at regular intervals, and an upper limit switch (4c) and an upper limit switch are installed on the upper and lower sides of the guide support (2)(2a) on the moving line. In an electric material carrier that can limit the vertical movement distance of the lifting body (3) by installing a lower limit switch (4d), the interior of the drive sprocket (5) comprises: an outer ring (71) coupled to the drive sprocket (5) by a key and a keyway; and an inner ring (70) provided at the center of the outer ring (71) and coupled to the drive shaft (4b) by a key and a keyway.An electric cargo carrier with enhanced safety, characterized by having a plurality of unidirectional clutch bearings (7) installed between the outer ring (71) and the inner ring (70), each bearing comprising a cam case (72), a plurality of steel balls (73) installed within the cam case (72), and a plurality of cam clutches (74) installed on one side of the steel balls (73) and supported by a ring-shaped coil spring (75), so as to transmit driving rotational force in one direction.

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