Heavy plate fork

Abstract

The utility model discloses a heavy plate fork, which belongs to the technical field of warehousing systems and comprises a first plate fork, a second plate fork and a third plate fork which are sequentially connected in a telescopic manner, a driving mechanism for driving the second plate fork to stretch out and draw back is arranged on the first plate fork, an idle wheel is arranged on the second plate fork, a chain is wound on the idle wheel, one end of the chain is fixed on the first plate fork, and the other end of the chain is fixed on the third plate fork. A first vertical plate is arranged on the first plate fork, a first guide wheel is arranged on the side wall of the first vertical plate, a second vertical plate is arranged on the third plate fork, a second guide wheel is arranged on the side wall of the second vertical plate, a guide rail is arranged on the second plate fork, and guide grooves are formed in the two sides of the guide rail. The first guide wheel and the second guide wheel are slidably arranged in guide grooves in the two sides of the guide rail correspondingly. And the guide rail is provided with an accommodating groove wound with a chain. According to the scheme, the whole plate fork is compact in structure, the thickness of the plate fork is reduced while the bearing requirement of the plate fork is met, and the stability and flexibility of the plate fork are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of storage systems, in particular to a heavy-duty plate fork. Background Art

[0002] Heavy-duty plate forks need to be able to withstand a lot of heavy objects, so their design must ensure sufficient structural strength and stability, and on this basis, reduce the thickness of the plate forks. Structural requirements for heavy-duty plate forks: First, the plate forks are subjected to the greatest force when they are extended for picking up and placing goods. Based on this working state, the structural strength of the plate forks can meet the maximum stroke under the state of maximum net load. In addition, the plate forks need to ensure deflection when the load is extended. Secondly, the plate forks extend to pick up goods when empty, reset with the goods, reach the designated placement position with the cargo platform, extend the forks to place the goods, and the plate forks can ensure stability during the entire working process.

[0003] At present, the general structure of heavy-duty plate forks on the market is an upper fork, a middle fork, a lower fork and a drive device. The way to increase the load is generally to increase the thickness of the fork plate, increase the diameter of the follower wheel, and increase the contact points between the forks. Therefore, although the load-bearing capacity of the plate fork will meet the requirements, it will greatly increase the weight and thickness of the plate fork, the height of the fork plate, the amount of consumables and the processing time will all increase, and the service life and flexibility of the plate fork will also be reduced.

[0004] For example, Chinese patent publication number CN114735390A, publication date July 12, 2022, named "Storage and retrieval mechanism based on intelligent robot and intelligent stacking robot", includes: plate fork assembly: including a first plate fork, a second plate fork and a third plate fork which are telescopically connected in sequence, one end of the first plate fork, the second plate fork and the third plate fork on the same side is the first end, and the other end is the second end; telescopic drive mechanism: installed on the first plate fork, the telescopic drive mechanism is connected to the second plate fork; transmission mechanism: including a first transmission component, one end of the first transmission component is fixed to the first end of the third plate fork, and the other end is fixed to the second plate fork after passing through the first transmission wheel provided at the second end of the second plate fork and the second transmission wheel provided at the first end of the first plate fork in sequence to realize differential movement of the third plate fork and the second plate fork.

[0005] The disadvantages of the existing patents are that the existing heavy-duty plate forks meet the load-bearing requirements of the plate forks by increasing the thickness of the plate forks, the diameter of the follower wheels or the contact points between the forks, which greatly increases the weight and height of the plate forks, increases the production cost of the plate forks, and reduces the flexibility of the plate forks. Utility Model Content

[0006] The purpose of the utility model is to solve the problem that the existing heavy-duty plate fork meets the load-bearing requirement of the plate fork by increasing the thickness of the plate fork, the diameter of the follower wheel or the contact points between the forks, which causes a significant increase in the weight and height of the plate fork, increases the production cost of the plate fork, and reduces the flexibility of the plate fork. A heavy-duty plate fork is provided which reduces the overall thickness of the plate fork and improves the stability of the plate fork while ensuring the weighing requirement of the plate fork.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A heavy-duty plate fork comprises a first plate fork, a second plate fork and a third plate fork which are telescopically connected in sequence, the first plate fork is provided with a driving mechanism for driving the second plate fork to telescope, the second plate fork is provided with an idler wheel, a chain is wound around the idler wheel, one end of the chain is fixed to the first plate fork, and the other end of the chain is fixed to the third plate fork, the first plate fork is provided with a first vertical plate, the side wall of the first vertical plate is provided with a first guide wheel, the third plate fork is provided with a second vertical plate, the side wall of the second vertical plate is provided with a second guide wheel, the second plate fork is provided with a guide rail, guide grooves are provided on both sides of the guide rail, the first guide wheel and the second guide wheel are respectively slidably arranged in the guide grooves on both sides of the guide rail; the guide rail is provided with a receiving groove for winding the chain. The heavy-duty plate fork described in this scheme links the first plate fork, the second plate fork and the third plate fork through the guide rail provided with guide grooves and receiving grooves, so that the overall plate fork structure is compact, the thickness of the plate fork is reduced while the load-bearing requirements of the plate fork are met, and the stability and flexibility of the plate fork are improved. The linkage structure of the first plate fork, the second plate fork and the third plate fork is concentrated on the side wall of the guide rail. The first guide wheel ensures the contact point between the first plate fork and the second plate fork, and the second guide wheel ensures the contact point between the second plate fork and the third plate fork. The second plate fork is driven to extend and retract through a driving mechanism, and the third plate fork is driven to extend and retract at the same time through a chain. When the second plate fork is expanded, the third plate fork is also expanded at the same time, and when the second plate fork is contracted, the third plate fork is also contracted at the same time. The overall plate fork structure is stable. The first vertical plate cooperates with the guide rail through the first guide wheel, and the second vertical plate cooperates with the guide rail through the second guide wheel. While compressing the thickness of the overall plate fork, the structural stability between the first plate fork and the second plate fork, and the second plate fork and the third plate fork is ensured, and the deflection is ensured when the load is extended. The overall strength of the plate fork is improved by the cooperation of the guide rail with the first vertical plate and the second vertical plate, and the guide rail and the first vertical plate and the second vertical plate are all longitudinally long strips with a small overall volume, which increases the overall weight of the plate fork less and improves the flexibility of the plate fork. The chain is stored in the receiving groove, and the chain moves in the receiving groove. The receiving groove is distributed along the length direction of the guide rail, which further compresses the overall thickness of the plate fork and effectively reduces the assembly space.

[0009] Preferably, the guide rail extends along the length direction of the second plate fork, and there are two guide rails, which are respectively arranged on both sides of the second plate fork. Since the plate fork has a large load, the risk factor of rollover will increase. Starting from the extension structure and the stable structure, the plate fork uses a chain to drive the upper fork assembly. The space of the chain is combined with the space of the guide rail to reduce the gap between the upper fork assembly and the connecting assembly. The three cam followers are matched on both sides of the guide rail, so that the gap between the connecting assembly and the fixed assembly can be reduced; the multiple grooves of the guide rail are used to reduce the gap between the assemblies at each level, thereby reducing the overall height of the plate fork. The guide rails are located on both sides of the second plate fork, reducing the lateral connection surface of the second plate fork, making the lateral direction of the second plate fork tend to be integrated, increasing the stability of the second plate fork during the extension and retraction process, and increasing the safety factor of the overall plate fork during operation.

[0010] Preferably, the accommodating groove includes a first accommodating groove and a second accommodating groove, the first accommodating groove is located on a side of the guide rail that cooperates with the first plate fork, the second accommodating groove is located on a side of the guide rail that cooperates with the second plate fork, and the idler wheel is located at the same end of the first accommodating groove and the second accommodating groove. There are multiple first guide wheels, which are arranged along the length direction of the first vertical plate, and there are multiple second guide wheels, which are arranged along the length direction of the second vertical plate. The first guide wheel and the second guide wheel cooperate with the guide groove to increase the contact points between the first plate fork and the second plate fork, and between the second plate fork and the third plate fork, which increases the connection strength of the plate fork on the one hand, and reduces the deflection of the plate fork after elongation on the other hand, thereby improving the stability of the plate fork. The idler wheel is used to change the direction of the chain.

[0011] Preferably, the first plate fork is provided with a first chain support seat, the third plate fork is provided with a second chain support seat, and the first chain support seat is slidably arranged in the receiving groove. The idler wheel is arranged at one end of the guide rail or an idler wheel receiving chamber is arranged at one end of the guide rail, one end of the chain is connected to the first chain support seat, and the other end of the chain passes around the idler wheel and is connected to the second chain support seat. When the plate fork is extended or contracted, the first chain support seat is slidably arranged in the receiving groove, and the first chain support seat can be located in the receiving groove or outside the receiving groove. In addition, a chain tensioning bracket is provided to adjust the tension of the chain.

[0012] Preferably, the first plate fork, the third plate fork and the two guide rails form a cavity, and the second plate fork is located in the cavity, thereby effectively reducing the assembly space.

[0013] Preferably, the driving mechanism comprises a driving motor arranged on the first plate fork and a rack arranged on the second plate fork, a wheel set is arranged at the output end of the driving motor, and the wheel set is meshed with the rack. The rack extends along the length direction of the second plate fork.

[0014] Preferably, the wheel set includes a driving wheel arranged at the output end of the driving motor and a driven wheel arranged on the driving wheel, the number of the driven wheels is at least two, and the other two driven wheels and the driving wheel are arranged in a triangular manner. The driven wheels and the driving wheels are arranged in a triangular manner to increase the contact points between the wheel set and the rack, so that the transmission of the wheel set and the rack is more stable.

[0015] Preferably, a return block is provided between the first plate fork and the third plate fork, the return block comprising a first block provided on the first plate fork and a second block provided on the third plate fork, the first block and the second block restrict cooperation. The return block prevents the second plate fork and the third plate fork from misaligning when returning.

[0016] Preferably, the first plate fork is provided with an encoder for cooperating with the drive motor and a torque limiter for preventing the drive motor from overloading, and also includes a stroke detector arranged on the first plate fork. The encoder and the torque limiter are used in conjunction with the drive motor. The stroke detector ensures that the stroke of the second plate fork does not exceed the safe stroke, thereby increasing the safety factor of the plate fork during operation.

[0017] Preferably, a sensor for detecting the extension and retraction of the second plate fork and the third plate fork is disposed on the first vertical plate. The sensor is used to detect the extension and retraction state of the second plate fork and the third plate fork.

[0018] Therefore, the utility model has the following beneficial effects: (1) the overall plate fork structure is compact, which ensures the load-bearing requirements of the plate fork while reducing the thickness of the plate fork, thereby improving the stability and flexibility of the plate fork; (2) the overall strength of the plate fork is improved by the cooperation of the guide rail with the first vertical plate and the second vertical plate, and the guide rail and the first vertical plate and the second vertical plate are all longitudinally long strips with a small overall volume, which reduces the increase in the overall weight of the plate fork and improves the flexibility of the plate fork; (3) the safety factor of the plate fork during operation is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the transmission system in the utility model.

[0020] Figure 2 It is a front view of the utility model.

[0021] Figure 3 It is a side view of the utility model.

[0022] Figure 4 It is a bottom view of the utility model.

[0023] As shown in the figure:

[0024] First plate fork 1, first vertical plate 1.1, first guide wheel 1.2, first chain support seat 1.3,

[0025] Second plate fork 2,

[0026] The third plate fork 3, the second vertical plate 3.1, the second guide wheel 3.2, the second chain support seat 3.3,

[0027] Driving mechanism 4, driving motor 4.1, rack 4.2, wheel set 4.3, driving wheel 4.3.1, driven wheel 4.3.2,

[0028] Idler wheel 5, chain 6,

[0029] Guide rail 7, guide groove 7.1, receiving groove 7.2, first receiving groove 7.2.1, second receiving groove 7.2.2,

[0030] Stopper 8, encoder 9, torque limiter 10, stroke detector 11, sensor 12. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the technical solution embodiments of the utility model clearer, the utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0032] Embodiment 1, as Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, a heavy-duty plate fork comprises a first plate fork 1, a second plate fork 2 and a third plate fork 3 which are telescopically connected in sequence, the first plate fork 1 is provided with a driving mechanism 4 for driving the second plate fork 2 to telescope, the second plate fork 2 is provided with an idler wheel 5, a chain 6 is wound around the idler wheel 5, one end of the chain 6 is fixed to the first plate fork 1, and the other end of the chain 6 is fixed to the third plate fork 3, the first plate fork 1 is provided with a first vertical plate 1.1, the side wall of the first vertical plate 1.1 is provided with a first guide wheel 1.2, the third plate fork 3 is provided with a second vertical plate 3.1, the side wall of the second vertical plate 3.1 is provided with a second guide wheel 3.2, the second plate fork 2 is provided with a guide rail 7, guide grooves 7.1 are provided on both sides of the guide rail 7, the first guide wheel 1.2 and the second guide wheel 3.2 are respectively slidably arranged in the guide grooves 7.1 on both sides of the guide rail 7; the guide rail 7 is provided with a accommodating groove 7.2 for winding the chain 6.

[0033] A heavy-duty plate fork in the above embodiment links the first plate fork 1, the second plate fork 2 and the third plate fork 3 through a guide rail 7 provided with a guide groove 7.1 and a receiving groove 7.2, so that the overall plate fork structure is compact, which ensures the load-bearing requirements of the plate fork while reducing the thickness of the plate fork, thereby improving the stability and flexibility of the plate fork.

[0034] Due to the structural requirements of heavy-duty plate forks: First, the plate fork is subjected to the greatest force when it is in the extended state for picking up and placing goods. Based on this working state, the structural strength of the plate fork can meet the requirements of reaching the maximum stroke under the state of maximum net load. In addition, the plate fork needs to ensure deflection when the load is extended. Secondly, the plate fork is extended to pick up goods when it is empty, resets with the goods, arrives at the designated placement position with the cargo platform, and extends the fork to place the goods. The plate fork can ensure stability during the entire working process. Existing heavy-duty plate forks meet the load-bearing requirements of the plate fork by increasing the thickness of the plate fork, the diameter of the follower wheel, or the contact point between the forks, which greatly increases the weight and height of the plate fork, increases the production cost of the plate fork, and reduces the flexibility of the plate fork.

[0035] In this embodiment, the linkage structure of the first plate fork 1, the second plate fork 2 and the third plate fork 3 is concentrated on the side wall of the guide rail 7, the first guide wheel 1.2 ensures the contact point between the first plate fork 1 and the second plate fork 2, the second guide wheel 3.2 ensures the contact point between the second plate fork 2 and the third plate fork 3, the second plate fork 2 is driven to extend and retract by the driving mechanism 4, and the third plate fork 3 is driven to extend and retract at the same time by the chain 6, when the second plate fork 2 is expanded, the third plate fork 3 is also expanded at the same time, when the second plate fork 2 is contracted, the third plate fork 3 is also contracted at the same time, and the overall plate fork structure is stable. The first vertical plate 1.1 cooperates with the guide rail 7 through the first guide wheel 1.2, and the second vertical plate 3.1 cooperates with the guide rail 7 through the second guide wheel 3.2, while compressing the thickness of the overall plate fork, ensuring the structural stability between the first plate fork 1 and the second plate fork 2, and the second plate fork 2 and the third plate fork 3, and ensuring the deflection when the load is extended. The overall strength of the plate fork is improved by the cooperation of the guide rail 7 with the first vertical plate 1.1 and the second vertical plate 3.1. The guide rail 7, the first vertical plate 1.1 and the second vertical plate 3.1 are all in the shape of longitudinal strips, with a small overall volume, which adds less to the overall weight of the plate fork, thereby improving the flexibility of the plate fork. The chain 6 is accommodated in the receiving groove 7.2, and the chain 6 moves in the receiving groove 7.2. The receiving groove 7.2 is distributed along the length direction of the guide rail 7, further compressing the overall thickness of the plate fork and effectively reducing the assembly space. The problem that the existing heavy-duty plate fork meets the load-bearing requirements of the plate fork by increasing the thickness of the plate fork, the diameter of the follower wheel or the contact point between the forks is solved, which greatly increases the weight and height of the plate fork, increases the production cost of the plate fork, and reduces the flexibility of the plate fork.

[0036] Figure 1This is a schematic diagram of the transmission system of the present scheme, which has the following beneficial effects: the overall plate fork structure is compact, which ensures the load-bearing requirements of the plate fork while reducing the thickness of the plate fork, thereby improving the stability and flexibility of the plate fork; the overall strength of the plate fork is improved by the cooperation of the guide rail 7 with the first vertical plate 1.1 and the second vertical plate 3.1, and the guide rail 7 and the first vertical plate 1.1 and the second vertical plate 3.1 are all longitudinally long strips with a small overall volume, which lessens the increase in the overall weight of the plate fork, thereby improving the flexibility of the plate fork; and increasing the safety factor of the plate fork during operation.

[0037] Embodiment 2, as Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, a heavy-duty plate fork comprises a first plate fork 1, a second plate fork 2 and a third plate fork 3 which are telescopically connected in sequence, the first plate fork 1 is provided with a driving mechanism 4 for driving the second plate fork 2 to telescope, the second plate fork 2 is provided with an idler wheel 5, a chain 6 is wound around the idler wheel 5, one end of the chain 6 is fixed to the first plate fork 1, and the other end of the chain 6 is fixed to the third plate fork 3, the first plate fork 1 is provided with a first vertical plate 1.1, the side wall of the first vertical plate 1.1 is provided with a first guide wheel 1.2, the third plate fork 3 is provided with a second vertical plate 3.1, the side wall of the second vertical plate 3.1 is provided with a second guide wheel 3.2, the second plate fork 2 is provided with a guide rail 7, guide grooves 7.1 are provided on both sides of the guide rail 7, the first guide wheel 1.2 and the second guide wheel 3.2 are respectively slidably arranged in the guide grooves 7.1 on both sides of the guide rail 7; the guide rail 7 is provided with a accommodating groove 7.2 for winding the chain 6.

[0038] In this embodiment, Figure 2 As shown, the guide rail 7 extends along the length direction of the second plate fork 2, and there are two guide rails 7, which are respectively arranged on both sides of the second plate fork 2. Because the plate fork has a large load, the risk factor of overturning will increase. Starting from the extension structure and the stable structure, this plate fork uses the chain 6 to drive the upper fork assembly. The space of the chain 6 is combined with the space of the guide rail 7 to reduce the gap between the upper fork assembly and the connecting assembly. The three cam followers are all matched on both sides of the guide rail 7, so that the gap between the connecting assembly and the fixed assembly can be reduced; the multiple grooves of the guide rail 7 are used to reduce the gap between the assemblies at each level, thereby reducing the overall height of the plate fork. The guide rails 7 are located on both sides of the second plate fork 2, reducing the lateral connection surface of the second plate fork 2, making the lateral direction of the second plate fork 2 tend to be integrated, increasing the stability of the second plate fork 2 during the telescopic process, and increasing the safety factor of the overall plate fork during operation.

[0039] There are two ways to arrange the first vertical plate 1.1, the guide rail 7 and the second vertical plate 3.1. Structure 1: the first vertical plate 1.1 is located on the inner side of the guide rail 7, and the second vertical plate 3.1 is located on the outer side of the guide rail 7; Structure 2: the second vertical plate 3.1 is located on the inner side of the guide rail 7, and the first vertical plate 1.1 is located on the outer side of the guide rail 7.

[0040] Specifically, Figure 2 As shown, the receiving groove 7.2 includes a first receiving groove 7.2.1 and a second receiving groove 7.2.2. The first receiving groove 7.2.1 is located on a side of the guide rail 7 that cooperates with the first plate fork 1, and the second receiving groove 7.2.2 is located on a side of the guide rail 7 that cooperates with the second plate fork 2. The idler wheel 5 is located at the same end of the first receiving groove 7.2.1 and the second receiving groove 7.2.2. There are multiple first guide wheels 1.2, which are arranged along the length direction of the first vertical plate 1.1. There are multiple second guide wheels 3.2, which are arranged along the length direction of the second vertical plate 3.1. The first guide wheel 1.2 and the second guide wheel 3.2 cooperate with the guide groove 7.1 to increase the contact points between the first plate fork 1 and the second plate fork 2, and the second plate fork 2 and the third plate fork 3. On the one hand, the connection strength of the plate fork is increased, and on the other hand, the deflection of the plate fork after elongation is reduced, thereby improving the stability of the plate fork. The idler wheel 5 is used to change the direction of the chain 6.

[0041] Specifically, Figure 1 As shown, Figure 1 The schematic diagram of the transmission system of this scheme is as follows: the first plate fork 1 is provided with a first chain 6 support seat 1.3, the third plate fork 3 is provided with a second chain 6 support seat 3.3, and the first chain 6 support seat 1.3 is slidably arranged in the receiving groove 7.2. The idler wheel 5 is arranged at one end of the guide rail 7 or the guide rail 7 is provided with an idler wheel 5 receiving chamber at one end, one end of the chain 6 is connected to the first chain 6 support seat 1.3, and the other end of the chain 6 bypasses the idler wheel 5 and is connected to the second chain 6 support seat 3.3. When the plate fork is extended or contracted, the first chain 6 support seat 1.3 is slidably arranged in the receiving groove 7.2, and the first chain 6 support seat 1.3 can be located in the receiving groove 7.2 or outside the receiving groove 7.2.

[0042] Specifically, Figure 2 As shown, the first plate fork 1, the third plate fork 3 and the two guide rails 7 constitute a cavity, and the second plate fork 2 is located in the cavity. The assembly space is effectively reduced. The driving mechanism 4 includes a driving motor 4.1 arranged on the first plate fork 1 and a rack 4.2 arranged on the second plate fork 2. The output end of the driving motor 4.1 is provided with a wheel set 4.3, and the wheel set 4.3 is meshed with the rack 4.2. The rack 4.2 extends along the length direction of the second plate fork 2. The wheel set 4.3 includes a driving wheel 4.3.1 arranged at the output end of the driving motor 4.1 and a driven wheel 4.3.2 arranged on the driving wheel 4.3.1. The number of the driven wheels 4.3.2 is at least two, and the other two driven wheels 4.3.2 and the driving wheel 4.3.1 are arranged in a triangular manner. The driven wheel 4.3.2 and the driving wheel 4.3.1 are arranged in a triangular manner, increasing the contact points between the wheel set 4.3 and the rack 4.2, so that the transmission of the wheel set 4.3 and the rack 4.2 is more stable.

[0043] Further, such as Figure 2As shown, a return block 8 is provided between the first plate fork 1 and the third plate fork 3, and the return block 8 includes a first block 8 provided on the first plate fork 1 and a second block 8 provided on the third plate fork 3, and the first block 8 and the second block 8 limit the fit. The return block 8 prevents the second plate fork 2 and the third plate fork 3 from being misaligned when returning.

[0044] Further, such as Figure 2 As shown, the first plate fork 1 is provided with an encoder 9 for cooperating with the drive motor 4.1 and a torque limiter 10 for preventing the drive motor 4.1 from overloading, and also includes a stroke detector 11 arranged on the first plate fork 1. The encoder 9 and the torque limiter 10 are used in conjunction with the drive motor 4.1. The stroke detector 11 ensures that the stroke of the second plate fork 2 does not exceed the safe stroke, thereby increasing the safety factor of the plate fork during operation.

[0045] Further, such as Figure 2 As shown, the first vertical plate 1.1 is provided with a sensor 12 for detecting the extension and retraction of the second plate fork 2 and the third plate fork 3. The sensor 12 is used to detect the extension and retraction state of the second plate fork 2 and the third plate fork 3.

[0046] A heavy-duty plate fork in the above embodiment links the first plate fork 1, the second plate fork 2 and the third plate fork 3 via a guide rail 7 provided with a guide groove 7.1 and a receiving groove 7.2, so that the overall plate fork structure is compact, and the thickness of the plate fork is reduced while ensuring the load-bearing requirements of the plate fork, thereby improving the stability and flexibility of the plate fork. The linkage structure of the first plate fork 1, the second plate fork 2 and the third plate fork 3 is concentrated on the side wall of the guide rail 7, the first guide wheel 1.2 ensures the contact point between the first plate fork 1 and the second plate fork 2, and the second guide wheel 3.2 ensures the contact point between the second plate fork 2 and the third plate fork 3. The second plate fork 2 is driven to extend and retract through the driving mechanism 4, and the third plate fork 3 is driven to extend and retract at the same time through the chain 6. When the second plate fork 2 is extended, the third plate fork 3 is also extended at the same time, and when the second plate fork 2 is retracted, the third plate fork 3 is also retracted at the same time, and the overall plate fork structure is stable. The first vertical plate 1.1 cooperates with the guide rail 7 through the first guide wheel 1.2, and the second vertical plate 3.1 cooperates with the guide rail 7 through the second guide wheel 3.2, which compresses the thickness of the entire plate fork while ensuring the structural stability between the first plate fork 1 and the second plate fork 2, and the second plate fork 2 and the third plate fork 3, and ensuring the deflection when the load is extended. The overall strength of the plate fork is improved by the cooperation of the guide rail 7 with the first vertical plate 1.1 and the second vertical plate 3.1, and the guide rail 7 and the first vertical plate 1.1 and the second vertical plate 3.1 are all longitudinally long strips with a small overall volume, which lessens the overall weight of the plate fork and improves the flexibility of the plate fork. The chain 6 is accommodated in the receiving groove 7.2, and the chain 6 moves in the receiving groove 7.2. The receiving groove 7.2 is distributed along the length direction of the guide rail 7, which further compresses the overall thickness of the plate fork and effectively reduces the assembly space. The invention solves the problem that the existing heavy plate forks meet the load-bearing requirements of the plate forks by increasing the thickness of the plate forks, the diameter of the follower wheels or the contact points between the forks, which greatly increases the weight and height of the plate forks, increases the production cost of the plate forks, and reduces the flexibility of the plate forks.

[0047] This embodiment has the following beneficial effects: the overall plate fork structure is compact, which ensures the load-bearing requirements of the plate fork while reducing the thickness of the plate fork, thereby improving the stability and flexibility of the plate fork; the overall strength of the plate fork is improved by the cooperation of the guide rail 7 with the first vertical plate 1.1 and the second vertical plate 3.1, and the guide rail 7 and the first vertical plate 1.1 and the second vertical plate 3.1 are all longitudinally long strips with a small overall volume, which lessens the increase in the overall weight of the plate fork, thereby improving the flexibility of the plate fork; and increasing the safety factor of the plate fork during operation.

[0048] The specific embodiments described above are only preferred implementations of the present invention, and are not intended to limit the specific implementation scope of the present invention. All equivalent changes made in accordance with the shape and structure of the present invention should be included in the protection scope of the present invention.

Claims

1. A heavy-duty plate fork, comprising a first plate fork, a second plate fork and a third plate fork which are telescopically connected in sequence, the first plate fork is provided with a driving mechanism for driving the second plate fork to telescope, the second plate fork is provided with an idler wheel, a chain is wound around the idler wheel, one end of the chain is fixed to the first plate fork, and the other end is fixed to the third plate fork, characterized in that: The first plate fork is provided with a first vertical plate, the side wall of the first vertical plate is provided with a first guide wheel, the third plate fork is provided with a second vertical plate, the side wall of the second vertical plate is provided with a second guide wheel, the second plate fork is provided with a guide rail, guide grooves are provided on both sides of the guide rail, the first guide wheel and the second guide wheel are respectively slidably arranged in the guide grooves on both sides of the guide rail; the guide rail is provided with a accommodating groove for winding a chain.

2. A heavy-duty plate fork according to claim 1, characterized in that: The guide rail extends along the length direction of the second plate fork. There are two guide rails, which are respectively arranged on both sides of the second plate fork.

3. A heavy-duty plate fork according to claim 2, characterized in that: The accommodating groove includes a first accommodating groove and a second accommodating groove, the first accommodating groove is located on a side of the guide rail that cooperates with the first plate fork, the second accommodating groove is located on a side of the guide rail that cooperates with the second plate fork, and the idler wheel is located at the same end of the first accommodating groove and the second accommodating groove.

4. A heavy-duty plate fork according to claim 1, 2 or 3, characterized in that: The first plate fork is provided with a first chain support seat, the third plate fork is provided with a second chain support seat, and the first chain support seat is slidably disposed in the accommodating groove.

5. A heavy-duty plate fork according to claim 3, characterized in that: The first plate fork, the third plate fork and two guide rails form a cavity, and the second plate fork is located in the cavity.

6. A heavy-duty plate fork according to claim 1, 2, 3 or 5, characterized in that: The driving mechanism comprises a driving motor arranged on the first plate fork and a rack arranged on the second plate fork, and a wheel set is arranged at the output end of the driving motor, and the wheel set is meshed with the rack.

7. A heavy-duty plate fork according to claim 6, characterized in that: The wheel set includes a driving wheel arranged at the output end of the driving motor and a driven wheel arranged on the driving wheel. The number of the driven wheels is at least two, and the two driven wheels and the driving wheel are arranged in a triangle.

8. A heavy-duty plate fork according to claim 1, 2, 3 or 5, characterized in that: A return block is provided between the first plate fork and the third plate fork, and the return block comprises a first block provided on the first plate fork and a second block provided on the third plate fork, and the first block and the second block limit the fit.

9. A heavy-duty plate fork according to claim 1 or 2 or 3 or 5, characterized in that: The first plate fork is provided with an encoder cooperating with the driving motor and a torque limiter to prevent the driving motor from overloading, and also includes a travel detector arranged on the first plate fork.

10. A heavy-duty plate fork according to claim 9, characterized in that: The first vertical plate is provided with a sensor for detecting the extension and retraction of the second plate fork and the third plate fork.

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