Tail shaft adjusting and limiting device for a scooter

Abstract

This utility model relates to the field of tail shaft adjustment technology, specifically a tail shaft adjustment and limiting device for a conveyor. It includes a hollow limiting block, an end-bolted cover, a bearing mounting support shaft on the cover, and four connecting rods with sensor heads radially fixed to the extended end of the support shaft. An internally threaded block of an L-shaped plate is fixed to the top of the limiting block, and the L-shaped plate is equipped with a proximity switch to detect the rotation of the sensor heads. Sliding grooves on both sides of the limiting block cooperate with sliding blocks inside the limiting frame for guidance. A through hole is opened at the top of the limiting frame of the welded fixing plate, and the bottom end of a threaded rod is screwed into the internally threaded block with clearance fit. The threaded rod is equipped with two limiting sleeves to hold springs, and the bottom limiting sleeve is threaded to adjust the preload. A tail shaft translation groove is opened on the fixing plate for the tail shaft to pass through the limiting block, and the tail shaft is splined to the support shaft. This device monitors the rotation state of the tail shaft through the sensor head and proximity switch, achieves elastic lifting and buffering adjustment through the spring limiting sleeve mechanism, and locks the height by tightening the nut to maintain stable tension in the transmission system.

Description

Technical Field

[0001] This utility model relates to the field of tail shaft adjustment technology, specifically a tail shaft adjustment and limiting device for a conveyor. Background Technology

[0002] In continuous conveying equipment like chutes, the tail shaft, as a key component supporting and driving the transmission chain or belt, directly affects the operational stability of the equipment due to the accuracy of its installation position. During operation, factors such as changes in material load, natural wear of components, or thermal expansion and contraction gradually alter the tension of the chain or belt. If the tail shaft position remains fixed, an overly loose transmission belt may cause slippage, misalignment, or even chain derailment; an overly tight belt will accelerate component wear, increase energy consumption, or even lead to breakage. Therefore, the tail shaft of a chute needs to have position adjustment capabilities to adjust its relative position in real time according to actual conditions, maintaining the transmission system at a reasonable tension. The function of such adjustment and limiting devices is to provide a reliable mechanism that, while ensuring the rigidity and positioning accuracy of the tail shaft installation, allows operators to conveniently and safely adjust the height or translation distance of the tail shaft, thereby ensuring the long-term stable and efficient operation of the chute transmission system and reducing the risk of unplanned downtime.

[0003] Conventional tail shaft devices typically rely solely on mechanical limits or simple bolt adjustments, lacking the ability to monitor the tail shaft's rotation status in real time. This makes it impossible to detect abnormalities such as belt slippage and chain slack in a timely manner. Furthermore, the adjustment mechanisms often employ rigid locking, which cannot buffer instantaneous impact loads during operation and is difficult to automatically compensate for slight changes in the length of transmission components caused by temperature variations or wear. This can easily lead to problems such as excessive tension accelerating component wear or excessive tension causing chain skipping or derailment, requiring frequent manual intervention and adjustments. Utility Model Content

[0004] The purpose of this invention is to provide a tail shaft adjustment and limiting device for a conveyor belt to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A tail shaft adjustment and limiting device for a conveyor includes a limiting block, the limiting block being hollow inside, and a cover being bolted to one end of the limiting block. Four connecting rods are fixedly installed radially at intervals on one end of the supporting shaft extending outside the cover. A sensing head is fixedly installed at the end of each connecting rod. An internal threaded block is fixedly installed at the top of the limiting block. An L-shaped plate is fixedly installed on the side of the internal threaded block facing the cover and the sensing head. A proximity switch is fixedly installed at the top of the horizontal arm of the L-shaped plate.

[0007] Preferably, the limiting block has symmetrical sliding grooves on both sides, and the sliding grooves are slidably engaged with the sliding block. The sliding block is installed on the inner side walls of the limiting frame by several bolts.

[0008] Preferably, the limiting frame is installed vertically on one side of the fixing plate by welding, and the edge of the fixing plate is provided with a plurality of fixing holes spaced apart, and bolts are inserted through the fixing holes to the external conveyor to form a fixation.

[0009] Preferably, the fixed plate has a tail shaft translation groove at the position where the tail shaft of the conveyor passes, and several diagonal bracing plates are installed at intervals along the length direction on the outer side of the connection between the fixed plate and the limiting frame.

[0010] Preferably, a through hole is provided at the center of the top of the limiting frame, and a threaded rod passes through the through hole with a clearance fit between the two. A locking nut is installed on the threaded rod by thread, and the locking nut is located above the through hole of the limiting frame.

[0011] Preferably, the bottom end of the threaded rod is threadedly installed on the top of the internal threaded block, and two limiting cylinders are threadedly installed below the through hole of the limiting frame and above the internal threaded block.

[0012] Preferably, a spring is provided between the limiting cylinders, the spring is sleeved on the outside of the threaded rod, and the limiting cylinder at the top of the spring is in clearance fit with the threaded rod, while the threaded cylinder at the bottom of the spring is in thread fit with the threaded rod.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. This type of tail shaft adjustment and limit device for a conveyor belt drives four sets of sensor heads to rotate synchronously through the spline connection between the support shaft and the tail shaft. Combined with the proximity switch fixed on the L-shaped plate to periodically detect the position changes of the sensor heads, it realizes real-time monitoring of the tail shaft rotation status and early warning of abnormal fluctuations, effectively preventing equipment failures caused by belt slippage or chain jamming.

[0015] 2. This tail shaft adjustment and limiting device for a conveyor uses a threaded connection between the bottom end of a threaded rod and an internal threaded block to drive the limiting block to rise and fall. By utilizing the elastic extension and contraction characteristics of the springs fitted with two limiting cylinders, as well as the vertical guiding constraint of the sliding block and the sliding groove, it can not only achieve precise adjustment and locking of the tail shaft height, but also continuously absorb the impact of the transmission system and automatically compensate for wear and extension, thereby maintaining the chain or belt in an optimized tension state at all times. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the fixing plate of this utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the limiting block of this utility model;

[0019] Figure 4 This is a schematic diagram of the structure of the cap of this utility model.

[0020] In the diagram: 101, limiting block; 102, cover; 103, support shaft; 104, connecting rod; 105, sensing head; 106, internal threaded block; 107, L-shaped plate; 108, proximity switch; 109, sliding groove; 110, sliding block; 111, limiting frame; 112, fixing plate; 113, fixing hole; 114, tail shaft translation groove; 115, diagonal brace plate; 116, through hole; 117, threaded rod; 118, locking nut; 119, limiting cylinder; 120, spring. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figures 1-4 As shown, this utility model provides a technical solution:

[0023] A tail shaft adjustment and limiting device for a conveyor includes a limiting block 101. The limiting block 101 is hollow inside, and a cover 102 is bolted to one end of it. Four connecting rods 104 are fixedly installed radially at one end of a support shaft 103 extending outside the cover 102. A sensing head 105 is fixedly installed at the end of each connecting rod 104. An internal threaded block 106 is fixedly installed at the top of the limiting block 101. An L-shaped plate 107 is fixedly installed on the side of the internal threaded block 106 facing the cover 102 and the sensing head 105. A proximity switch 108 is fixedly installed at the top of the horizontal arm of the L-shaped plate 107.

[0024] The above scheme utilizes a hollow structure inside the limiting block to accommodate the tail shaft bearing; a bolted cover seals the hollow end of the limiting block; a support shaft mounted on the bearing in the middle of the cover provides rotational support; four connecting rods radially fixed to the extended end of the support shaft extend the sensing distance; a sensing head fixed to the end of the connecting rods generates a sensing signal source; an internally threaded block fixed to the top of the limiting block provides a foundation for thread adjustment; an L-shaped plate fixed to the internally threaded block forms an installation platform; and a proximity switch fixed to the top of the horizontal arm of the L-shaped plate detects changes in the position of the sensing head and outputs an electrical signal.

[0025] In this embodiment, preferably, the limiting block 101 has symmetrical sliding grooves 109 on both sides, and the sliding grooves 109 are slidably engaged with the sliding block 110. The sliding block 110 is installed on the inner two side walls of the limiting frame 111 by several bolts.

[0026] The above scheme forms a guide track by symmetrically opening sliding grooves on both sides of the limiting block; the sliding grooves and the sliding block constrain the vertical movement trajectory of the limiting block; and the sliding block is fixed to the inner two side walls of the limiting frame by bolts to form a stable installation foundation.

[0027] In this embodiment, preferably, the limiting frame 111 is welded and erected on one side of the fixing plate 112. The edge of the fixing plate 112 is provided with a plurality of fixing holes 113 at intervals. Bolts pass through the fixing holes 113 to the external conveyor to form a fixation.

[0028] The above scheme involves welding the limiting frame vertically onto one side of the fixed plate to form a rigid support structure; and using bolts through several fixed holes spaced apart on the edge of the fixed plate to achieve the anchoring connection between the device and the external conveyor.

[0029] In this embodiment, preferably, a tail shaft translation groove 114 is provided on the fixed plate 112 at the position where the tail shaft of the conveyor passes, and a plurality of diagonal bracing plates 115 are installed at intervals along the length direction on the outer side of the connection between the fixed plate 112 and the limiting frame 111.

[0030] The above scheme allows the tail shaft of the conveyor to horizontally pass into the limiting block through the tail shaft translation groove opened on the fixed plate; the diagonal bracing plates installed at intervals at the angle between the fixed plate and the limiting frame enhance the bending strength of the overall structure.

[0031] In this embodiment, preferably, a through hole 116 is provided in the middle of the top of the limiting frame 111, and a threaded rod 117 passes through the through hole 116 with clearance fit between the two. A locking nut 118 is installed on the threaded rod 117 by thread, and the locking nut 118 is located above the through hole 116 of the limiting frame 111.

[0032] The above scheme provides a channel for the threaded rod to move through the through hole at the top of the limiting frame; the clearance fit between the threaded rod and the through hole allows the threaded rod to move freely up and down; and the locking nut installed on the threaded rod presses against the top surface of the limiting frame to achieve height locking.

[0033] In this embodiment, preferably, the bottom end of the threaded rod 117 is threadedly installed on the top end of the internal threaded block 106, and two limiting cylinders 119 are threadedly installed below the through hole 116 of the limiting frame 111 and above the internal threaded block 106.

[0034] The above scheme achieves force transmission through the threaded connection of the threaded rod bottom end screwed into the internal threaded block; the two limiting cylinders installed on the threaded rod constrain the upper and lower ends of the spring respectively; and the spring sleeved on the outside of the threaded rod provides elastic tension.

[0035] In this embodiment, preferably, a spring 120 is provided between the limiting cylinders 119. The spring 120 is sleeved on the outside of the threaded rod 117, and the limiting cylinder 119 at the top of the spring 120 is in clearance fit with the threaded rod 117, while the threaded cylinder at the bottom of the spring 120 is in thread fit with the threaded rod 117.

[0036] The above scheme achieves axial force transmission through the clearance fit between the limiting sleeve at the top of the spring and the threaded rod; it achieves spring preload adjustment through the threaded fit between the limiting sleeve at the bottom of the spring and the threaded rod; and it absorbs transmission system fluctuations and maintains a constant tension state through the spring's own extension and contraction.

[0037] In this embodiment, the tail shaft adjustment and limiting device for a conveyor is used such that, through a plurality of fixing holes 113 spaced apart on its edge, bolts are used to pass through and fasten the fixing plate 112 to the frame of the external conveyor, thus completing the basic fixing of the adjustment and limiting device; the limiting frame 111 installed on one side of the fixing plate 112 is vertically fixed by welding, and a plurality of diagonal bracing plates 115 spaced apart along the length direction at the connection angle between the frame 111 and the fixing plate 112 enhance the overall rigidity of the vertical structure; the tail shaft of the conveyor to be adjusted first passes through the tail shaft translation groove 114 correspondingly opened on the fixing plate 112 and enters the hollow area inside the limiting block 101; the hollow structure is designed to accommodate and wrap the outer side of the tail shaft. The bearing provides a space for its placement and protection; the cover 102 is tightly installed at the end of the limit block 101 by bolts, sealing the hollow area inside containing the tail shaft bearing; the support shaft 103 is rotatably supported by the bearing installed in the middle of the cover 102, and four connecting rods 104 are fixedly installed radially at one end of the support shaft 103 extending out of the cover 102, with sensing heads 105 fixed to the ends of the connecting rods 104 respectively; the tail shaft is synchronously connected to the support shaft 103 through its spline structure; therefore, when the tail shaft rotates, it drives the support shaft 103 to rotate synchronously, thereby causing the four connecting rods 104 and the sensing heads 105 at their ends to move in a circular motion around the axis of the support shaft 103.

[0038] As the tail shaft rotates continuously, driving the support shaft 103 to rotate, the four sensing heads 105 periodically pass by the proximity switch 108 fixedly installed at the top of the L-shaped plate 107. Each time the sensing head 105 passes the effective sensing distance of the proximity switch 108, an electrical pulse signal is generated. By continuously monitoring the frequency and regularity of these electrical signals, the operator can perceive the smooth state of the tail shaft rotation. Any uneven rotation or speed fluctuation caused by belt slippage, chain slack, or external jamming will cause abnormal characteristics in the electrical signal, thereby providing timely warning of potential faults and preventing the problem from escalating and affecting the overall operation of the conveyor.

[0039] When it is necessary to adjust the tail shaft position height to accommodate changes in chain or belt tension, the operator first loosens the locking nut 118 located above the through hole 116 at the top of the limiting frame 111, temporarily releasing its hard limit on the descent depth of the threaded rod 117; then the operator screws the limiting sleeve 119 located below the spring 120, which forms a threaded engagement with the threaded rod 117; screwing into the lower limiting sleeve 119 will cause it to move upward, thereby compressing the spring 120, which is sleeved on the outside of the threaded rod 117 and clamped between the upper and lower limiting sleeves 119; screwing out the lower limiting sleeve 119 in the opposite direction can reduce the pressure on the spring 120; when the spring 120 is compressed, it generates a rebound force, which acts on the upper limiting sleeve 119 above it, which is in clearance engagement with the threaded rod 117, pushing the upper limiting sleeve 119 upward to press tightly against the lower end face of the through hole 116 of the limiting frame 111. Based on the principle of action and reaction, spring 120 applies a force in the opposite direction to the lower limiting cylinder 119. This force is transmitted to the entire threaded rod 117 through a threaded connection. The bottom end of the threaded rod 117 is threadedly connected to the top of the internal threaded block 106, which is fixed to the top of the limiting block 101. Therefore, the compression or release state of spring 120 drives the threaded rod 117 to move the limiting block 101 as a whole and its internal tail shaft bearing and tail shaft support structure, overcoming the guiding sliding friction between the sliding block 110 and the sliding grooves 109 on both sides of the limiting block 101, and generating precise vertical displacement—when spring 120 is compressed, it pushes the limiting block 101 and the tail shaft to move downward; when the pressure of spring 120 is released, spring 120 rebounds and may be accompanied by the influence of equipment gravity or load, allowing the limiting block 101 and the tail shaft to rise moderately. The precise sliding fit between the sliding block 110 and the sliding groove 109 plays a guiding role throughout the adjustment process, ensuring that the displacement trajectory is accurate, vertical, and without deviation.

[0040] After adjusting to the desired position, immediately tighten the locking nut 118 so that its lower end face presses tightly against the top of the limit frame 111, locking the position of the threaded rod 117, thereby stabilizing the tail shaft at the target height. During equipment operation, the spring 120 sleeved on the threaded rod 117 is always in a pre-compressed working state. On the one hand, it actively provides and maintains appropriate tension for the chain or belt. On the other hand, when the transmission system is subjected to instantaneous impact load, or when the chain / belt length changes slightly due to temperature changes or natural wear, the elastic extension and contraction of the spring 120 can automatically absorb these changes and make dynamic compensation. This continuous flexible adjustment characteristic effectively avoids the risk of accelerated wear or breakage of transmission components due to excessive tension (too tight), and also eliminates the potential for slippage, jumping or even chain derailment caused by insufficient tension (too loose), ultimately ensuring that the tail shaft of the conveyor can maintain reliable and stable operation under various working conditions.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A tail shaft adjustment and limiting device for a conveyor, comprising a limiting block (101), characterized in that: The limiting block (101) is hollow inside, and a cover (102) is installed at one end of it by bolts. A support shaft (103) is installed in the middle of the cover (102) by bearings. Four connecting rods (104) are fixedly installed radially at one end of the support shaft (103) that extends out of the cover (102). A sensing head (105) is fixedly installed at the end of each connecting rod (104). An internal thread block (106) is fixedly installed at the top of the limiting block (101). An L-shaped plate (107) is fixedly installed on the side of the internal thread block (106) facing the cover (102) and the sensing head (105). A proximity switch (108) is fixedly installed at the top of the horizontal arm of the L-shaped plate (107).

2. The tail shaft adjustment and limiting device of the conveyor according to claim 1, characterized in that: The limiting block (101) has symmetrical sliding grooves (109) on both sides. The sliding grooves (109) are slidably engaged with the sliding block (110). The sliding block (110) is installed on the inner two side walls of the limiting frame (111) by several bolts.

3. The tail shaft adjustment and limiting device of the conveyor according to claim 2, characterized in that: The limiting frame (111) is installed vertically on one side of the fixing plate (112) by welding. The edge of the fixing plate (112) is provided with a number of fixing holes (113) spaced apart. Bolts are inserted into the fixing holes (113) to form a fixed connection to the external conveyor.

4. The tail shaft adjustment and limiting device of the chute as described in claim 3, characterized in that: The fixed plate (112) is provided with a tail shaft translation groove (114) at the position where the tail shaft of the conveyor passes. Several diagonal bracing plates (115) are installed at intervals along the length direction at the connection angle between the fixed plate (112) and the limiting frame (111).

5. The tail shaft adjustment and limiting device of the conveyor according to claim 4, characterized in that: The limiting frame (111) has a through hole (116) in the middle of its top end. A threaded rod (117) passes through the through hole (116) and the two are fitted with a clearance. A locking nut (118) is installed on the threaded rod (117) by thread. The locking nut (118) is located above the through hole (116) of the limiting frame (111).

6. The tail shaft adjustment and limiting device of a conveyor according to claim 5, characterized in that: The bottom end of the threaded rod (117) is threadedly installed on the top of the internal threaded block (106). The threaded rod (117) is located below the through hole (116) of the limiting frame (111) and above the internal threaded block (106) with two limiting cylinders (119).

7. The tail shaft adjustment and limiting device of a conveyor according to claim 6, characterized in that: A spring (120) is provided between the limiting cylinders (119). The spring (120) is sleeved on the outside of the threaded rod (117). The limiting cylinder (119) at the top of the spring (120) is in clearance fit with the threaded rod (117), and the threaded cylinder at the bottom of the spring (120) is in thread fit with the threaded rod (117).

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