An electric telescopic conveyor that can be stretched section by section and the space between rollers can be increased

Abstract

The present invention relates to an electric telescopic conveyor which can be stretched section by section and the distance between rollers can be increased. A mounting plate is arranged on the outer side of a supporting leg, and lockable telescopic frames are arranged on the left and right sides of the mounting plate respectively. Two groups of interlocking locking mechanisms are arranged between two groups of lockable telescopic frames, and the interlocking locking mechanisms include left and right locking plates. The two groups of left locking plates are connected by a rotating shaft in the longitudinal direction, and bearings are arranged at both ends of the rotating shaft, so that when the conveyor is stretched or contracted, the right locking plate can touch the bearing. An intermediate X-shaped telescopic frame is arranged between the two groups of transverse lockable telescopic frames. Main rollers are arranged on the upper part of the lockable telescopic frame and the intermediate X-shaped telescopic frame, and left and right connecting plates are hingedly arranged on the lower part, and auxiliary brackets are hingedly connected between the left and right connecting plates, and auxiliary rollers are arranged between the two groups of auxiliary brackets in the longitudinal direction. The present invention can realize segmented stretching, and the auxiliary rollers can pop out when being pulled apart to increase the distance between the rollers, and the auxiliary rollers can be retracted when being retracted without affecting the retracted length.

Description

Technical field:

[0001] The invention relates to the field of telescopic conveyors, and more particularly to an electric telescopic conveyor which can be stretched section by section and has denser spacing between rollers. Background technology:

[0002] Telescopic conveyors are flexible, convenient and space-saving. They can be stretched out when needed and used as ordinary conveyors, and can also be bent for conveying. They can be retracted when not in use and do not take up space. However, existing telescopic conveyors have the following disadvantages: the distance between adjacent rollers is fixed, and sometimes material falls from between adjacent rollers during the conveying process. They cannot be used universally for different conveyed items. When conveying different products, different telescopic conveyors need to be replaced, which is time-consuming and labor-intensive. In addition, the distance between the rollers is large after being pulled apart, which is not suitable for conveying small objects. Therefore, the existing conveyors need to be improved. Summary of the invention:

[0003] The purpose of the present invention is to address the deficiencies of the prior art and to provide an electric telescopic conveyor that can be stretched section by section and the distance between rollers can be increased. The present invention can achieve segmented stretching to ensure that the auxiliary rollers are flush with the upper surface of the main rollers. When the telescopic conveyor is opened, the auxiliary rollers can pop out from between adjacent rollers to increase the distance between the rollers. When the telescopic conveyor is contracted, the auxiliary rollers can be retracted from between adjacent rollers, and the auxiliary rollers do not affect the retracted length.

[0004] The technical solutions of the present invention are as follows:

[0005] An electric telescopic conveyor that can be stretched section by section and with increased density between rollers, comprising a plurality of groups of supporting legs, each group of supporting legs is provided with a mounting plate on the outside, and each group of mounting plates is provided with a group of lockable telescopic frames on the left and right sides respectively; two groups of interlocking locking mechanisms are provided between the two groups of lockable telescopic frames, and the interlocking locking mechanisms include a left locking piece installed on the left lockable telescopic frame and a right locking piece installed on the right lockable telescopic frame; and the two groups of left locking pieces are connected longitudinally by a rotating shaft, and bearings are provided at both ends of the rotating shaft, so that the right locking piece can touch the bearing during the stretching or contraction of the conveyor; the two groups of transverse mounting plates are provided An intermediate X-shaped telescopic frame is installed between the two groups of lockable telescopic frames between the mounting plates; the lockable telescopic frame includes a first X-shaped telescopic frame and a second X-shaped telescopic frame connected to each other, and the mounting plates are respectively provided with a first longitudinal slot and a second longitudinal slot, the first X-shaped telescopic frame is composed of a telescopic piece a and a telescopic piece b hingedly connected in the middle, and the second X-shaped telescopic frame is composed of a telescopic piece c and a telescopic piece d hingedly connected in the middle, the length of the telescopic piece c is greater than the length of the telescopic piece a, the telescopic piece a is movably mounted on the first longitudinal slot by a bolt a with a copper sleeve, and the telescopic piece c is movably mounted on the second longitudinal slot by a bolt b with a copper sleeve.

[0006] Preferably, the first X-shaped telescopic frame, the second X-shaped telescopic frame and the middle X-shaped telescopic frame are connected by first hollow rivets, and a main roller is installed between the two groups of first hollow rivets in the longitudinal direction at the upper end; left and right connecting plates are installed at the lower parts of the first X-shaped telescopic frame, the second X-shaped telescopic frame and the middle X-shaped telescopic frame respectively by second hollow rivets, and an auxiliary bracket is hingedly connected between the left and right connecting plates by hinge bolts, and a long slot hole is provided in the middle of the auxiliary bracket, and the auxiliary bracket is sleeved on the middle hinge axis of the first X-shaped telescopic frame, the second X-shaped telescopic frame or the middle X-shaped telescopic frame through the long slot hole; an auxiliary roller is installed between the two groups of corresponding auxiliary brackets in the longitudinal direction; when stretching, the auxiliary roller can extend from between two adjacent groups of main rollers, and its upper section is in the same plane with the upper section of the main roller, and when shrinking, the auxiliary roller can drop below the main roller.

[0007] A left locking slot and a left locking slot connected to the left locking slot are provided in the middle of the left locking plate, and the left end of the left locking plate is hinged on the first hollow rivet connecting the first X-shaped telescopic frame on the left side and the lower part of the second X-shaped telescopic frame, and the bolt a on the telescopic plate a of the left lockable telescopic frame is cooperated and installed in the left locking slot and the bolt a can be locked in the left locking slot.

[0008] A right locking slide groove and a right locking groove communicated with the right locking slide groove are provided on the right side of the right locking plate, the middle part of the right locking plate is hingedly connected with the bolt a on the telescopic plate a of the lockable telescopic frame on the right side, and the first hollow rivet at the lower part of the first X-shaped telescopic frame on the right side and the second X-shaped telescopic frame is sleeved in the right locking slide groove and can be locked in the right locking groove.

[0009] Preferably, the first X-shaped telescopic frame and the middle X-shaped telescopic frame have the same structure, and during the telescopic process of the second X-shaped telescopic frame, the telescopic piece c and the telescopic piece a are always in a parallel state.

[0010] Preferably, the right lower end of the telescopic piece a of the lockable telescopic frame on the left side is movably mounted on the first longitudinal slot hole on the left side through the upper left bolt a, and the right lower end of the telescopic piece c of the lockable telescopic frame on the left side is movably mounted on the second longitudinal slot hole on the left side through the lower left bolt b; the left lower end of the telescopic piece a of the lockable telescopic frame on the right side is movably mounted on the first longitudinal slot hole on the right side through the upper right bolt a, and the left lower end of the telescopic piece c of the lockable telescopic frame on the right side is movably mounted on the second longitudinal slot hole on the right side through the lower right bolt b.

[0011] Preferably, the left locking plate is an L-shaped structure, a hinge hole a is provided at one end of the horizontal portion of the L-shaped structure, a left locking slide groove and a left locking groove that are connected are provided at the other end, and an axis hole a is provided on the vertical portion of the L-shaped structure.

[0012] Preferably, a motor fixing plate is installed between the two groups of mounting plates in the longitudinal direction, a motor is installed on the motor fixing plate, and a conveyor belt is installed between the output shaft of the motor and the corresponding roller of the main roller at the upper end, and between the roller of the main roller at the upper end and the adjacent middle hinge shaft.

[0013] Preferably, a set of fixed rollers is installed between the middle parts of the two sets of mounting plates in the longitudinal direction, and the distances between the fixed rollers and the main rollers adjacent on both sides are the same, and the upper cut surface of the fixed rollers is flush with the upper cut surface of the main rollers.

[0014] Preferably, the length of the expansion piece c is twice the length of the expansion piece, the bolt b on the expansion piece c can slide up and down along the second longitudinal slot, and the bolt a on the expansion piece a can slide up and down along the first longitudinal slot.

[0015] Preferably, the lower end of the supporting leg is provided with a brakeable universal wheel.

[0016] The beneficial effects of the present invention are:

[0017] The invention discloses a telescopic conveyor with rollers that can be densely packed after stretching. When the telescopic conveyor is opened, the auxiliary rollers can pop out from between the adjacent main rollers, and the auxiliary rollers can rise to the same height as the main rollers and be flush with them, so that the roller spacing is denser. When stretching, the number of rollers between the main rollers is doubled, which is more conducive to conveying. When shrinking, the auxiliary rollers can be retracted from between the adjacent rollers, and the auxiliary rollers do not affect the retracted length, and the auxiliary rollers do not occupy space when retracted.

[0018] The present invention can realize segmented stretching or contraction, only one unit is stretched or contracted each time, and the auxiliary rollers can be controlled to completely rise to the right position. Description of the drawings:

[0019] The present invention will be further described below in conjunction with the accompanying drawings:

[0020] Figure 1 It is a structural schematic diagram of the present invention.

[0021] Figure 2 It is a three-dimensional structural schematic diagram of the mounting plate of the present invention, the lockable telescopic frames on its left and right sides, and the middle X-shaped telescopic frame.

[0022] Figure 3 for Figure 2 main view.

[0023] Figure 4 for Figure 2 Top view of the .

[0024] Figure 5 for Figure 3 AA cross-sectional view.

[0025] Figure 6 It is a structural schematic diagram of the lockable telescopic frame of the present invention.

[0026] Figure 7 It is a schematic diagram of the structure of the motor and the conveyor belt of the present invention. Specific implementation method:

[0027] The following description is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0028] In addition, the terms "vertical", "horizontal", "top", "bottom", "front", "back", "up", "down", "inside", "outside" and the like mentioned in the embodiments of the present invention indicate directions or positional relationships based on the attached Figure 1 The orientation or position relationship shown, or the orientation or position relationship in which the product is usually placed when in use, is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like in the description should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] See attached Figures 1 to 7 An electric telescopic conveyor that can be stretched section by section and the space between rollers can be increased includes multiple groups of support legs 1, and the lower ends of the support legs are equipped with brakeable universal wheels 2. The brakeable universal wheels are convenient for locking the conveyor after stretching and contraction, and are also convenient for transportation and movement. There is a conveying unit between two groups of support legs 1 in the horizontal direction, and eight conveying units are set in this application.

[0031] A mounting plate 3 is installed on the outside of each set of supporting legs. The mounting plate 3 is a square plate. A set of lockable telescopic frames I is installed on the left and right sides of each set of mounting plates respectively; two sets of interlocking locking mechanisms II are installed between the two sets of lockable telescopic frames, and the interlocking locking mechanisms include a left locking piece 5 installed on the left lockable telescopic frame and a right locking piece 6 installed on the right lockable telescopic frame; and the two sets of left locking pieces are connected by a rotating shaft 4 in the longitudinal direction, and bearings are installed at both ends of the rotating shaft. In the process of stretching or shrinking the conveyor, the right locking piece and the bearing can touch each other; an intermediate locking piece is installed between the two sets of lockable telescopic frames between the two sets of transverse mounting plates. X-shaped telescopic frame 7; the lockable telescopic frame includes a first X-shaped telescopic frame 8 and a second X-shaped telescopic frame 9 connected to each other, and a first longitudinal slot 301 and a second longitudinal slot 302 are respectively provided on the mounting plate, the first X-shaped telescopic frame is composed of a telescopic piece a801 and a telescopic piece b802 hingedly connected in the middle, and the second X-shaped telescopic frame is composed of a telescopic piece c901 and a telescopic piece d902 hingedly connected in the middle, the length of the telescopic piece c is greater than the length of the telescopic piece a, the telescopic piece a is movably mounted on the first longitudinal slot by a bolt a10 with a copper sleeve, and the telescopic piece c is movably mounted on the second longitudinal slot by a bolt b11 with a copper sleeve.

[0032] The first X-shaped telescopic frame, the second X-shaped telescopic frame and the middle X-shaped telescopic frame are connected by the first hollow rivet 12, and the main roller 13 is installed between the two groups of first hollow rivets in the longitudinal direction at the upper end; the first X-shaped telescopic frame, the second X-shaped telescopic frame and the lower part of the middle X-shaped telescopic frame are respectively installed with left and right connecting plates 15 and 16 through the second hollow rivet 14, and the left and right connecting plates are hingedly connected with an auxiliary bracket 18 through a hinge bolt 17, and a long slot hole 1801 is provided in the middle of the auxiliary bracket, and the auxiliary bracket is sleeved on the middle hinge shaft 19 of the first X-shaped telescopic frame, the second X-shaped telescopic frame or the middle X-shaped telescopic frame through the long slot hole; an auxiliary roller 20 is installed between the two corresponding groups of auxiliary brackets in the longitudinal direction; when stretching, the auxiliary roller can extend from between the two adjacent groups of main rollers, and its upper section is in the same plane with the upper section of the main roller, and when shrinking, the auxiliary roller can drop below the main roller.

[0033] A left locking groove 501 and a left locking groove 502 connected to the left locking groove are provided in the middle of the left locking plate 5, and the left end of the left locking plate is hinged on the first hollow rivet connecting the first X-shaped telescopic frame on the left side and the lower part of the second X-shaped telescopic frame, and the bolt a on the telescopic plate a of the lockable telescopic frame on the left side is cooperated and installed in the left locking groove and the bolt a can be locked in the left locking groove.

[0034] The left locking plate 5 is an L-shaped structure, a hinge hole a503 is provided at one end of the horizontal portion of the L-shaped structure, a left locking slide groove and a left locking groove that are connected are provided at the other end, and an axis hole a504 is provided on the vertical portion of the L-shaped structure.

[0035] A right locking groove 601 and a right locking groove 602 connected to the right locking groove are provided on the right side of the right locking plate 6. The middle part of the right locking plate is hingedly connected to the bolt a on the telescopic plate a of the lockable telescopic frame on the right side. The first hollow rivet at the lower part of the first X-shaped telescopic frame on the right side and the second X-shaped telescopic frame is sleeved in the right locking groove and can be locked in the right locking groove.

[0036] The right locking plate is a long strip structure, a hinge hole b is provided in the middle of the right locking plate, and a right locking slide groove and a right locking groove are provided on the right part of the right locking plate.

[0037] The first X-shaped telescopic frame and the middle X-shaped telescopic frame have the same structure. During the telescopic process of the second X-shaped telescopic frame, the telescopic piece c is always in a parallel state with the telescopic piece a. The length of the telescopic piece c is twice the length of the telescopic piece. The bolt b on the telescopic piece c can slide up and down along the second longitudinal slot, and the bolt a on the telescopic piece a can slide up and down along the first longitudinal slot.

[0038] The right lower end of the telescopic piece a of the lockable telescopic frame on the left side is movably mounted on the first longitudinal slot hole on the left side through the upper left bolt a1001, and the right lower end of the telescopic piece c of the lockable telescopic frame on the left side is movably mounted on the second longitudinal slot hole on the left side through the lower left bolt b1101; the left lower end of the telescopic piece a of the lockable telescopic frame on the right side is movably mounted on the first longitudinal slot hole on the right side through the upper right bolt a1002, and the left lower end of the telescopic piece c of the lockable telescopic frame on the right side is movably mounted on the second longitudinal slot hole on the right side through the lower right bolt b1102.

[0039] A motor fixing plate 21 is installed between the two groups of mounting plates in the longitudinal direction, a motor 22 is installed on the motor fixing plate, and a conveyor belt 23 is installed between the output shaft of the motor and the corresponding roller of the upper main roller, and between the roller of the upper main roller and the adjacent middle hinge shaft.

[0040] A set of fixed rollers 24 is installed between the middle parts of the two sets of mounting plates in the longitudinal direction, and the spacing between the fixed rollers and the main rollers adjacent on both sides is the same, and the upper cut surface of the fixed rollers is flush with the upper cut surface of the main rollers.

[0041] The working principle of the present invention is as follows: when the telescopic machine is opened, the auxiliary roller can pop out from between the adjacent main rollers, and the auxiliary roller can rise to the same height as the main roller and be flush, so that the roller spacing is increased, and the rollers between the main rollers are doubled during stretching, which is more conducive to transportation. When shrinking, the auxiliary roller can be retracted from between the adjacent rollers, and the auxiliary roller does not affect the retracted length, and the auxiliary roller does not occupy space when retracted. The present invention can realize segmented stretching, stretching only one unit at a time, and pulling them out in sequence, and the auxiliary rollers can be controlled to rise completely into place.

[0042] The stretching process is as follows: at this time, both the left and right sides are in a retracted state. When both the left and right sides are stretched, the upper left bolt a is locked in the left locking slot 502 connected to the left locking slot 501, and the lockable telescopic frame on the left cannot be opened. The first hollow rivet at the bottom of the first X-shaped telescopic frame and the second X-shaped telescopic frame on the right is located at the leftmost end of the right locking slot, and the lockable telescopic frame on the right can be stretched. During the stretching process, the left locking plate does not move, and the right locking plate moves up. When the first hollow rivet is located in the right locking slot after stretching, the left end of the right locking plate touches the toggle bearing, so that the left locking plate rotates around the first hollow rivet at the bottom of the first X-shaped telescopic frame and the second X-shaped telescopic frame on the left, and the upper left bolt a disengages from the left locking slot 502 and enters the left locking slot 501. The upper left bolt a can move freely along the left locking slot 501, and the lockable telescopic frame on the left can be pulled open. In this way, the interlocking is continued, and the conveyor can be pulled open in sequence.

[0043] The retraction process is as follows: at this time, both the left and right sides are in a stretched state, and the first hollow rivet at the lower part of the first X-shaped telescopic frame on the right and the second X-shaped telescopic frame is located in the right locking groove connected to the right locking groove, and the lockable telescopic frame on the right cannot be retracted. The upper left bolt a is located at the rightmost side of the left locking groove 501, and the lockable telescopic frame on the left can be retracted. During the retraction process, the left locking plate moves downward and the right locking plate does not move. When the upper left bolt a moves to the left into the left locking groove 502, the right end bearing of the left locking plate touches and presses down the right locking plate, and the right locking plate rotates around the upper right bolt a, causing the first hollow rivet to disengage from the right locking groove and enter the right locking groove. The first hollow rivet can move freely along the right locking groove, and the lockable telescopic frame on the right can be retracted at this time. It is unlocked all the time, and the conveyor can be retracted sequentially section by section.

[0044] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An electric telescopic conveyor that can be stretched section by section and the space between rollers can be encrypted, comprising a plurality of groups of support legs, each group of support legs is provided with a mounting plate on the outside, and each group of mounting plates is provided with a group of lockable telescopic frames on the left and right sides respectively; two groups of interlocking locking mechanisms are provided between the two groups of lockable telescopic frames, and the interlocking locking mechanisms include a left locking piece installed on the left lockable telescopic frame and a right locking piece installed on the right lockable telescopic frame; and the two groups of left locking pieces are connected longitudinally by a rotating shaft, and bearings are provided at both ends of the rotating shaft, so that the right locking piece can touch the bearing during the stretching or contraction of the conveyor; the two groups of transverse An intermediate X-shaped telescopic frame is installed between the two sets of lockable telescopic frames between the mounting plates; the lockable telescopic frame includes a first X-shaped telescopic frame and a second X-shaped telescopic frame connected to each other, and the mounting plates are respectively provided with a first longitudinal slot and a second longitudinal slot, the first X-shaped telescopic frame is composed of a telescopic piece a and a telescopic piece b connected by a middle hinge, and the second X-shaped telescopic frame is composed of a telescopic piece c and a telescopic piece d connected by a middle hinge, the length of the telescopic piece c is greater than the length of the telescopic piece a, the telescopic piece a is movably mounted on the first longitudinal slot by a bolt a with a copper sleeve, and the telescopic piece c is movably mounted on the second longitudinal slot by a bolt b with a copper sleeve; The first X-shaped telescopic frame, the second X-shaped telescopic frame and the middle X-shaped telescopic frame are connected by the first hollow rivet, and the main roller is installed between the two groups of first hollow rivets in the longitudinal direction at the upper end; the first X-shaped telescopic frame, the second X-shaped telescopic frame and the lower part of the middle X-shaped telescopic frame are respectively installed with left and right connecting plates by the second hollow rivet, and the left and right connecting plates are hingedly connected with an auxiliary bracket by a hinge bolt, and a long slot hole is provided in the middle of the auxiliary bracket, and the auxiliary bracket is sleeved on the middle hinge shaft of the first X-shaped telescopic frame, the second X-shaped telescopic frame or the middle X-shaped telescopic frame through the long slot hole; an auxiliary roller is installed between the two groups of corresponding auxiliary brackets in the longitudinal direction; when stretching, the auxiliary roller can extend from between the two adjacent groups of main rollers, and its upper section is in the same plane with the upper section of the main roller, and when shrinking, the auxiliary roller can drop below the main roller; The middle part of the left locking plate is provided with a left locking slide groove and a left locking groove connected with the left locking slide groove, the left end of the left locking plate is hinged on the first hollow rivet connecting the first X-shaped telescopic frame on the left side and the lower part of the second X-shaped telescopic frame, and the bolt a on the telescopic plate a of the left lockable telescopic frame is matched and installed in the left locking slide groove and the bolt a can be locked in the left locking groove; A right locking slide groove and a right locking groove communicated with the right locking slide groove are provided on the right side of the right locking plate, the middle part of the right locking plate is hingedly connected with the bolt a on the telescopic plate a of the lockable telescopic frame on the right side, and the first hollow rivet at the lower part of the first X-shaped telescopic frame on the right side and the second X-shaped telescopic frame is sleeved in the right locking slide groove and can be locked in the right locking groove.

2. An electric telescopic conveyor that can be stretched section by section and has denser spacing between rollers according to claim 1, characterized in that: The first X-shaped telescopic frame and the middle X-shaped telescopic frame have the same structure. During the telescopic process of the second X-shaped telescopic frame, the telescopic piece c and the telescopic piece a are always in a parallel state.

3. The electric telescopic conveyor that can be stretched section by section and the distance between rollers can be increased according to claim 1, characterized in that: The right lower end of the telescopic piece a of the lockable telescopic frame on the left side is movably mounted on the first longitudinal slot hole on the left side through the upper left bolt a, and the right lower end of the telescopic piece c of the lockable telescopic frame on the left side is movably mounted on the second longitudinal slot hole on the left side through the lower left bolt b; the left lower end of the telescopic piece a of the lockable telescopic frame on the right side is movably mounted on the first longitudinal slot hole on the right side through the upper right bolt a, and the left lower end of the telescopic piece c of the lockable telescopic frame on the right side is movably mounted on the second longitudinal slot hole on the right side through the lower right bolt b.

4. The electric telescopic conveyor that can be stretched section by section and the distance between rollers can be increased according to claim 1, characterized in that: The left locking plate is an L-shaped structure, a hinge hole a is provided at one end of the horizontal portion of the L-shaped structure, a left locking slide groove and a left locking groove are connected at the other end, and an axis hole a is provided on the vertical portion of the L-shaped structure.

5. The electric telescopic conveyor that can be stretched section by section and the distance between rollers can be increased according to claim 1, characterized in that: A motor fixing plate is installed between the two groups of mounting plates in the longitudinal direction, a motor is installed on the motor fixing plate, and a conveyor belt is installed between the output shaft of the motor and the corresponding roller of the upper main roller, and between the roller of the upper main roller and the adjacent middle hinge shaft.

6. The electric telescopic conveyor that can be stretched section by section and the distance between rollers can be increased according to claim 1, characterized in that: A group of fixed rollers is installed between the middle parts of the two groups of mounting plates in the longitudinal direction. The distances between the fixed rollers and the main rollers adjacent to the two sides are the same; and the upper cut surfaces of the fixed rollers are flush with the upper cut surfaces of the main rollers.

7. The electric telescopic conveyor that can be stretched section by section and the distance between rollers can be increased according to claim 1, characterized in that: The length of the expansion piece c is twice that of the expansion piece, the bolt b on the expansion piece c can slide up and down along the second longitudinal slot, and the bolt a on the expansion piece a can slide up and down along the first longitudinal slot.

8. The electric telescopic conveyor that can be stretched section by section and the distance between rollers can be increased according to claim 1, characterized in that: The lower end of the supporting leg is provided with a brakeable universal wheel.

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