Pallet stacking and unloading equipment and pallet loading equipment

Abstract

To enable safe and easy stacking and unloading of pallets. [Solution] The pallet stacking and unloading device 10 comprises a lifting trolley 40 and a pallet loading device 20 for loading pallets 50. The pallet loading device 20 is pivotable relative to the lifting trolley 40, and the pallet loading device 20 is provided with a hook mechanism 30 that engages with grooves 51a and 51b of the pallet 50.

Description

Technical Field

[0001] The present disclosure relates to pallet stacking, loading and unloading devices, and pallet loading devices.

Background Art

[0002] Conventionally, flat pallets have been used to transport ink ribbons, paper, etc. used in the production process of printing technology.

[0003] The pallets used in the production process are stacked one by one and stored. On the other hand, when using pallets in the production process, the topmost pallet is loaded and unloaded from the stacked pallets stored one by one, and the pallet is used.

[0004] Conventionally, the stacking and unloading operations of pallets have been carried out manually by workers. In this case, a work cart that can safely perform the stacking and unloading operations of pallets is desired, but such a work cart has not yet been developed.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0006] The present disclosure has been made in consideration of the above points, and an object thereof is to provide a pallet stacking, loading and unloading device and a pallet loading device that can safely and easily perform the stacking and unloading operations of pallets.

Means for Solving the Problems

[0007] A first embodiment of the present disclosure is a pallet stacking and unloading device for stacking and unloading pallets having grooves, comprising a lifting trolley having wheels, and a pallet loading device that is pivotably mounted on the lifting trolley and loads the pallets, wherein the pallet loading device is provided with a hook mechanism that engages with the grooves of the pallets.

[0008] A second embodiment of the present disclosure is a pallet stacking and unloading device in which, in the first embodiment, the groove of the pallet is formed on the upper or lower surface of the pallet, or is formed to penetrate from the upper surface to the lower surface of the pallet.

[0009] A third embodiment of this disclosure is a pallet stacking and unloading device in the first embodiment, wherein the pallet stacking device swings between a horizontal position and a vertical position.

[0010] A fourth embodiment of the present disclosure is a pallet stacking and unloading device in which, in the first or third embodiment, the pallet stacking device comprises a fixed part fixed on the lifting trolley and a pallet stacking device body that is pivotably provided with respect to the fixed part.

[0011] A fifth embodiment of the present disclosure is a pallet stacking and unloading device in which, in the first embodiment, the hook mechanism comprises a hook that swings between a locked position in which it engages with the groove of the pallet and an unlocked position in which it moves away from the groove of the pallet, and a hook actuation part that actsuates the hook, the hook being biased toward the locked position by an elastic body.

[0012] A sixth embodiment of the present disclosure is a pallet loading and unloading device in which, in the fifth embodiment, the hook of the hook mechanism has an elongated shape and, when in the locked position, forms an acute angle with respect to the loading surface of the pallet loading device which faces vertically, and faces diagonally upward.

[0013] A seventh embodiment of the present disclosure is a pallet loading device installed on a lifting trolley of a pallet stacking and unloading device for stacking and unloading pallets having grooves, wherein the pallet loading device is swingable relative to the lifting trolley and has a hook mechanism that engages with the grooves of the pallets.

[0014] An eighth embodiment of the present disclosure is a pallet loading device in which, in the seventh embodiment, the groove of the pallet is formed on the upper or lower surface of the pallet, or is formed to penetrate from the upper surface to the lower surface of the pallet.

[0015] A ninth embodiment of the present disclosure is a pallet loading device in the seventh embodiment in which the pallet loading device swings between a horizontal position and a vertical position.

[0016] A tenth embodiment of the present disclosure is a pallet loading device in which, in the seventh or ninth embodiment, the pallet loading device comprises a fixed part fixed on the lifting trolley and a pallet loading device body that is pivotably provided with respect to the fixed part.

[0017] An eleventh embodiment of the present disclosure is a pallet loading device in which, in the seventh embodiment, the hook mechanism has a hook that swings between a locked position in which it engages with the groove of the pallet and an unlocked position in which it moves away from the groove of the pallet, and a hook actuation part that actsuates the hook, the hook being biased toward the locked position by an elastic body.

[0018] A twelfth embodiment of the present disclosure is a pallet loading device in which, in the eleventh embodiment, the hook of the hook mechanism has an elongated shape and, when in the locked position, forms an acute angle with respect to the loading surface of the pallet loading device which faces vertically, and faces diagonally upward. [Effects of the Invention]

[0019] According to the present disclosure as described above, stacking and unloading operations of pallets can be safely and easily performed.

Brief Description of the Drawings

[0020] [Figure 1] FIG. 1 is a side view showing a pallet stacking and unloading apparatus taking a horizontal position according to the present disclosure. [Figure 2] FIG. 2 is a perspective view showing a pallet stacking and unloading apparatus taking a horizontal position according to the present disclosure. [Figure 3] FIG. 3 is a plan view showing a pallet stacking and unloading apparatus taking a horizontal position according to the present disclosure. [Figure 4] FIG. 4 is a side view showing a pallet stacking and unloading apparatus taking a vertical position according to the present disclosure. [Figure 5] FIG. 5 is a perspective view showing a pallet stacking and unloading apparatus taking a vertical position according to the present disclosure. [Figure 6] FIG. 6 is a view showing a hook mechanism of the pallet stacking and unloading apparatus. [Figure 7] FIG. 7 is an enlarged view of part A of FIG. 6, showing the hook mechanism in the locked position. [Figure 8] FIG. 8 is an enlarged view of part A of FIG. 6, showing the hook mechanism in the unlocked position. [Figure 9] FIG. 9 is a view showing the pallet stacking operation of the pallet stacking and unloading apparatus. [Figure 10] FIG. 10 is a view showing the pallet stacking operation of the pallet stacking and unloading apparatus. [Figure 11] FIG. 11 is a view showing the pallet stacking operation of the pallet stacking and unloading apparatus. [Figure 12] FIG. 12 is a view showing the pallet stacking operation of the pallet stacking and unloading apparatus. [Figure 13A] FIG. 13A is a perspective view of the pallet seen from the surface side. [Figure 13B] FIG. 13B is a perspective view of the pallet seen from the surface side. [Modes for carrying out the invention]

[0021] Embodiments of this disclosure will be described below with reference to the drawings.

[0022] Figures 1 to 13B here show the pallet stacking, loading and unloading device and pallet loading device according to the present disclosure.

[0023] First, the pallet stacking and loading / unloading device will be explained with reference to Figures 1 to 6.

[0024] The pallet stacking and unloading device 10 stacks and unloads the pallets shown in Figures 13A and 13B.

[0025] For example, a flat pallet 50 is used to transport ink ribbons, paper, etc., used in the production process of printing technology.

[0026] Pallets 50 used in the production process are stored stacked one by one. Alternatively, when pallets 50 are used in the production process, they are unloaded from the top layer of multiple stacked pallets 50 that are stored one by one, moved to the location of use, and then ink ribbons, paper, etc. are placed on the pallet 50 for transport.

[0027] Such a pallet 50 is flat overall. Figure 13A is a perspective view of the pallet 50 as seen from the front side, and Figure 13B is a plan view of the back side of the pallet 50.

[0028] Pallet 50 has a square shape when viewed from above and weighs, for example, 18kg to 20kg. Pallet 50 is made of polyolefin material containing 99% recycled plastic and has a large load capacity, for example, 1 ton.

[0029] Furthermore, as mentioned above, the entire pallet 50 weighs, for example, 18 kg, making it difficult for a single worker to stack or unload the pallets 50.

[0030] By the way, the pallet 50 has a flat surface (also called the top surface) 50A, and nine reinforcing support parts 52 protrude from the back surface 50B (also called the bottom surface) 50B.

[0031] Furthermore, as shown in Figure 13B, the pallet 50 has eight through grooves 51 that penetrate from the surface 50A to the back surface 50B, and the eight through grooves 51 are arranged in a square shape when viewed from above.

[0032] Furthermore, in Figure 13B, the hooks 31 of the hook mechanism 30, which will be described later, engage with the upper left through groove 51a and the upper right through groove 51b, respectively, of the eight through grooves 51.

[0033] Next, the pallet stacking and unloading device 10 will be described with reference to Figures 1 to 5. As shown in Figures 1 to 5, the pallet stacking and unloading device 10 comprises a lifting trolley 40 having wheels 42, and a pallet loading device 20 that is pivotably mounted on the lifting trolley 40 and loads pallets 50.

[0034] Furthermore, the pallet loading device 20 is equipped with a pair of hook mechanisms 30 that engage with two through grooves 51a and 51b of the pallet 50.

[0035] Of these, the pallet loading device 20 swings between a horizontal position and a vertical position relative to the lifting trolley 40.

[0036] In this embodiment, the lifting trolley 40 includes a lifting trolley body 41 that includes wheels 42 that travel on the floor surface, and a mounting platform 43 that is attached to the lifting trolley body 41 via a lifting mechanism 45. Support columns 46 that support the pallet loading device 20 are attached to the mounting platform 43.

[0037] The pallet loading device 20 also includes a fixed part 22 fixed to the mounting platform 43 of the lifting trolley 40, and a pallet loading device body 21 that is pivotably attached to the fixed part 22 via a rotating shaft 23 and on which the pallets 50 are placed.

[0038] Of these, the pallet loading device body 21 can swing relative to the fixed part 22 to assume a horizontal position (see Figures 1 to 3) and a vertical position (also called the vertical position) (see Figures 4 to 5).

[0039] In this embodiment, the fixing portion 22 of the pallet loading device 20 is fixed to the mounting platform 43 of the lifting trolley 40 by a fixing jig (not shown).

[0040] Furthermore, the fixing part 22 of the pallet loading device 20 is also fixed to the support column 46 attached to the mounting platform 43 of the lifting trolley 40.

[0041] Incidentally, as shown in Figures 1 to 5, the pallet loading device body 21 of the pallet loading device 20 is fitted with a pair of hook mechanisms 30 that engage with the two through grooves 51a and 51b of the pallet 50 described above.

[0042] Next, the pair of hook mechanisms 30 will be explained with reference to Figures 6 to 8.

[0043] As shown in Figures 6 to 8, the pallet loading device body 21 has a loading surface 21A on which the pallet 50 is placed. The pallet loading device body 21 is also provided with a fixing member 27 and a holding member 28 that extend downward from the loading surface 21A when the pallet loading device body 21 is in a horizontal position.

[0044] One end of the lever 32 is rotatably attached to the fixing member 27 via a rotating shaft 35, and a slender, rod-shaped hook 31 is attached to the other end of the lever 32.

[0045] Furthermore, a hook operating part 33 is attached to a lever 32 that rotates around a rotation axis 35 via a connecting member 38, and the other end of a spring 36, one end of which is attached to a holding member 28, is attached to the end of the hook operating part 33. The hook mechanism 30 is composed of the hook 31, the lever 32 that rotates around a rotation axis 35, and the hook operating part 33 attached to the lever 32 via a connecting member 38.

[0046] In this manner, the hook mechanism 30 swings relative to the pallet loading device body 21 via a rotating shaft 35 attached to a fixing member 27 of the pallet loading device body 21. In this case, the hook mechanism 30 swings between a locked position (see Figure 7) in which the hook 31 protrudes outward from the loading surface 21A and engages with the through grooves 51a and 51b of the pallet 50, and an unlocked position (see Figure 8) in which the hook 31 retracts inward from the loading surface 21A and separates from the through grooves 51a and 51b of the pallet 50.

[0047] Furthermore, as shown in Figure 7, when the operator releases their hand from the hook operating part 33, the force of the spring 36 pulls the hook operating part 33 toward the holding member 28. As a result, the hook mechanism 30, consisting of the hook operating part 33, connecting member 38, lever 32, and hook 31, swings clockwise as a whole, and the hook mechanism 30 takes a locked position in which the hook 31 engages with the through grooves 51a and 51b of the pallet 50.

[0048] On the other hand, as shown in Figure 8, the operator grasps the hook operating part 33 and rotates it counterclockwise. As a result, the hook mechanism 30, consisting of the hook operating part 33, connecting member 38, lever 32, and hook 31, also swings counterclockwise as a whole. This causes the hook mechanism 30 to take an unlocked position where the hook 31 moves away from the through grooves 51a and 51b of the pallet 50.

[0049] The pair of hook mechanisms 30, 30 are provided on a pair of sides of the pallet loading device 20 (the left and right pair of sides shown in Figure 3). The rotation shafts 35 of the pair of hook mechanisms 30, 30 extend in the left-right direction in Figure 3, passing through the left and right pair of sides.

[0050] Therefore, by operating the hook operating part 33 of one of the hook mechanisms 30, one hook mechanism 30 and the other hook mechanism 30 are swung simultaneously, allowing the pair of hook mechanisms 30 to simultaneously assume a locked or unlocked position.

[0051] When the hook mechanism 30 is in the locked position (see Figure 7), it is preferable that the angle α between the rod-shaped hook 31 and the loading surface 21A of the pallet loading device body 21 is acute, for example, 60° to 80°.

[0052] When this angle α exceeds 80°, as described later, when stacking the pallet 50 on the pallet stacking device body 21 which is positioned vertically, the hook 31 becomes easier to insert into the through grooves 51a and 51b of the pallet 50, but the hook 31 and the through grooves 51a and 51b of the pallet 50 cannot be stably engaged (see Figure 13B). On the other hand, in Figure 13B, when the angle α is less than 60°, when stacking the pallet 50 on the pallet stacking device body 21 which is positioned vertically and inserting the hook 31 into the through grooves 51a and 51b of the pallet 50, the hook 31 comes into contact with the back surface 50B of the pallet 50 and cannot be smoothly inserted into the through grooves 51a and 51b.

[0053] Therefore, the angle α between the hook 31 and the loading surface 21A of the pallet loading device body 21 is between 60° and 80°.

[0054] Furthermore, by setting the angle α between the hook 31 and the loading surface 21A as described above, when the pallet loading device body 21 is in a vertical position, the hook 31 will be facing diagonally upward.

[0055] Furthermore, the lifting platform 40 is equipped with a stopper 24 that locks the end of the pallet 50 on the pallet loading device 20.

[0056] In this embodiment, the lifting platform 40 is made entirely of stainless steel or SUS (stainless steel).

[0057] Furthermore, the pallet loading device 20 is also made entirely of aluminum or stainless steel.

[0058] Next, the operation of this embodiment, which has the above configuration, will be described below.

[0059] First, the operation of stacking pallets 50 using the pallet stacking and unloading device 10 will be described with reference to Figures 9 to 11.

[0060] First, the pallet loading device body 21 of the pallet loading device 20 is swung relative to the fixing part 22 to bring it to a vertical position (see Figure 9).

[0061] Next, a pallet 50, also oriented vertically, is placed on the pallet loading device body 21, which is positioned vertically, with the underside 50B of the pallet 50 facing the pallet loading device body 21. At this time, the worker grasps the hook operating part 33 of the hook mechanism 30 and positions the hook 31 perpendicular to the loading surface 21A.

[0062] In this way, when the pallet 50 is stacked on the pallet loading device body 21, the pair of hooks 31 can be smoothly inserted from the back surface 50B of the pallet 50 into the corresponding through grooves 51a and 51b.

[0063] Alternatively, the worker may grasp the hook operating part 33 and place the pallet 50 on the pallet loading device body 21 without orienting the hook 31 perpendicular to the loading surface 21A. In this case, the pair of hooks 31 are inclined at an acute angle α (60° to 80°) with respect to the loading surface 21A, and even if the pallet 50 is placed on the pallet loading device body 21 as is, the pair of hooks 31 can be inserted into the corresponding through grooves 51a and 51b from the back surface 50B of the pallet 50.

[0064] Next, as shown in Figure 10, the lifting mechanism 45 of the lifting trolley 40 lifts the mounting platform 43. At this time, the hook mechanism 30 is in a locked position where the hooks 31, 31 engage with the through grooves 51a, 51b. The pallet loading device body 21 also rises along with the mounting platform 43, and the hooks 31, 31 inserted into the corresponding through grooves 51a, 51b of the pallet 50 catch on the ends 51a1, 51b1 of the through grooves 51a, 51b.

[0065] In Figure 13B, the upper ends of the pair of through grooves 51a and 51b become the respective end portions 51a1 and 51b1.

[0066] In this way, by raising the mounting platform 43 using the lifting mechanism 45 of the lifting trolley 40, the pallet loading device body 21 rises, and the hooks 31 of the hook mechanism 30 catch on the ends 51a1 and 51b1 of the through grooves 51a and 51b. In this way, the pallet 50, with the through grooves 51a and 51b engaged with the hooks 31 and 31, rises as a whole while being lifted by the hooks 31 and 31.

[0067] Next, as shown in Figure 11, the pallet loading device body 21 is swung relative to the mounting platform 43 of the lifting trolley 40 to bring the pallet loading device body 21 to a horizontal position.

[0068] In this case, since the pallet loading device body 21 is raised by the lifting trolley 40, the pallet loading device body 21 and the pallet 50 are separated from the floor surface F. Therefore, when the pallet loading device body 21 is swung, neither the pallet loading device body 21 nor the pallet 50 comes into contact with the floor surface F, and there is no hindrance to the swinging motion of the pallet loading device body 21.

[0069] Subsequently, the pallet stacking and unloading device 10 is moved as a whole on the floor surface F via the wheels 42 of the lifting trolley 40 to transport the pallets 50 to a location where multiple pallets 50 are already stacked and stored on the floor surface.

[0070] In other words, as shown in Figure 12, multiple pallets 50 are stacked and stored on the floor in advance.

[0071] Next, the pallet stacking and unloading device 10 approaches the multiple pallets 50 that have been stacked in advance. During this time, the hooks 31 of the hook mechanism 30 are inserted into the through grooves 51a and 51b of the pallets 50, and the pallets 50 stacked on the pallet stacking device body 21 are held stably on the pallet stacking device body 21 because the hooks 31 of the hook mechanism 30 engage with the through grooves 51a and 51b of the pallets 50.

[0072] Subsequently, the lifting mechanism 45 of the lifting trolley 40 adjusts the height of the mounting platform 43, bringing the pallet 50 on the pallet loading device body 21 onto the uppermost pallet 50 of the stacked pallets 50. Next, the hook mechanism 30 is swung by the hook operating unit 33, bringing the hook mechanism 30 to the unlocked position where the pair of hooks 31, 31 separate from the through grooves 51a, 51b. In this state, the pallet 50 loaded on the pallet loading device body 21 is moved on the pallet loading device body 21, and in this way the pallet 50 on the pallet loading device body 21 is stacked onto the uppermost pallet 50 of the pre-stacked pallets 50. In this way, the pallet loading operation is completed.

[0073] Next, we will describe the loading and unloading process of pallet 50. The loading and unloading process of pallet 50 is the exact opposite of the pallet stacking process described above.

[0074] In other words, the height of the loading surface 21A of the pallet loading device body 21 is adjusted to match the topmost pallet 50 among the multiple pallets 50 that have been stacked in advance.

[0075] Next, the worker grasps the hook operating part 33 and swings the hook mechanism 30 to bring the hook mechanism 30 to the unlocked position where the pair of hooks 31, 31 are separated from the through grooves 51a, 51b.

[0076] Subsequently, the top pallet 50 of the stacked pallets 50 is moved horizontally and transported onto the pallet loading device body 21.

[0077] Subsequently, when the worker releases their hand from the hook operating part 33, the hook mechanism 30 swings to the locked position due to the force of the spring 36, and the hook 31 engages with the through grooves 51a and 51b of the pallet 50. As a result, the pallet 50 can be stably held on the pallet loading device body 21.

[0078] Subsequently, the pallets are stacked on the floor surface via the wheels 42 of the lifting trolley 40, and the loading and unloading device 10 as a whole is moved to a predetermined location. Next, the pallet loading device body 21 and the pallets 50 are swung 90° relative to the lifting trolley 40, thereby positioning the pallet loading device body 21 and the pallets 50 in a vertical position.

[0079] Next, the worker grasps the hook operating part 33 and swings the hook mechanism 30 to bring the hook mechanism 30 to the unlocked position.

[0080] The pallet 50 is then separated from the pallet loading device body 21, which is oriented vertically.

[0081] In this way, the loading and unloading of pallet 50 is completed.

[0082] As described above, according to this embodiment, the pallet loading device body 21 is brought to a vertical position, and the pallets 50 are stacked on the pallet loading device body 21. Next, the pallet loading device body 21 is swung from the vertical position to a horizontal position, and then the pallets 50 are moved horizontally on the pallet loading device body 21 in the horizontal position to perform the pallet loading operation. Furthermore, the pallets 50 can be loaded and unloaded by performing the reverse operation of the above. This makes it possible to safely and easily load and unload heavy pallets. The pallet loading device 20 also has multiple cylindrical frames made of aluminum or stainless steel. A pallet loading device 20 of a desired shape can be assembled simply by combining these cylindrical frames as appropriate. Furthermore, the pallet loading and unloading device 10 can be easily manufactured by attaching the assembled pallet loading device 20 to a lifting trolley 40 which is prepared separately from the pallet loading device 20.

[0083] Furthermore, the hook mechanism 30 swings between a locked position and an unlocked position, and when the operator releases their hand from the hook operating part 33, the force of the spring 36 ensures that it always returns to the locked position.

[0084] Therefore, whether the pallet loading device body 21 is in a horizontal or vertical position, when a pallet 50 is loaded onto the pallet loading device body 21, if the worker releases their hand from the hook operating part 33, the hook mechanism 30 will be locked by the force of the spring 36 and engage with the through grooves 51a and 51b of the pallet 50. As a result, the pallet 50 can be safely secured by the pallet loading device body 21 using the hook mechanism 30 without the worker having to return the hook mechanism 30 from the unlocked position to the locked position. Therefore, the pallet 50 will not fall from the pallet loading device body 21 in a place unintended by the worker, and the worker's safety can be ensured.

[0085] Furthermore, Pallet 50 is an environmentally friendly pallet because it contains 99% recycled plastic (recycled polyolefin resin) produced under the Recycling Law.

[0086] Furthermore, since the installation position of the hook mechanism 30 is determined in advance to match the through grooves 51a and 51b of the target pallet 50, the hook 31 of the hook mechanism 30 can be easily and smoothly inserted into and engaged with the through grooves 51a and 51b.

[0087] Furthermore, when operating the undisclosed pallet stacking and unloading device 10, unlike forklifts and cranes, the operator does not need to be a qualified person.

[0088] Furthermore, since the pallet stacking and unloading device described in this disclosure does not require electricity or pneumatics as a power source, there are no restrictions on the location of use.

[0089] Furthermore, unlike equipment such as forklifts, cranes, and robots, the pallet stacking and unloading device 10 disclosed herein is inexpensive and has a simple structure, thus reducing overall capital investment.

[0090] Furthermore, the stacking and unloading of pallets 50 can be performed by only one worker, thus reducing the workload.

[0091] In this way, stacking and unloading of pallets 50 can be easily performed by only one worker, and since the worker does not need to lift the pallets 50, the risk of back pain and other injuries to the worker is reduced. Furthermore, when the worker operates the pallet stacking and unloading device 10, they can operate it while checking the direction of travel to prevent contact with or collision with people or objects, thus enabling safe work. In the above embodiment, an example was shown in which the hook mechanism 30 engages with a through groove 51 that penetrates from the surface 50A to the back surface 50B of the pallet 50, but the groove that engages with the hook mechanism 30 may be formed on the surface 50A of the pallet 50 or on the back surface 50B of the pallet 50. [Explanation of Symbols]

[0092] 10. Pallet stacking and unloading equipment 20 Pallet loading device 21 Pallet loading device main body 22 Fixed part 23 Rotation axis 27 Fixing member 28 Retaining member 30 Hook mechanism 31 hooks 32 Lever 33 Hook operating part 35 Rotation axis 36 Springs 38 Connecting member 40 Lifting platform 41 Lifting platform body 42 wheels 43 Mounting platform 45 Lifting mechanism 46 Post 50 pallets 50A surface 50B back side 51a Through groove 51a1 End 51b Through groove 51b1 End 52 Support part

Claims

1. In a pallet stacking and unloading device that stacks and unloads pallets having grooves, A lifting platform with wheels, The system includes a pallet loading device that is pivotably mounted on the aforementioned lifting trolley and loads the pallets, A pallet stacking and unloading device, wherein the pallet stacking device is provided with a hook mechanism that engages with the groove of the pallet.

2. The pallet stacking and unloading device according to claim 1, wherein the groove of the pallet is formed on the upper or lower surface of the pallet, or extends through the pallet from the upper surface to the lower surface.

3. The pallet stacking and unloading device according to claim 1, wherein the pallet stacking device swings between a horizontal position and a vertical position.

4. The pallet stacking and unloading device according to claim 1 or 3, wherein the pallet stacking device comprises a fixed part fixed on the lifting trolley and a pallet stacking device body that is pivotably provided with respect to the fixed part.

5. The pallet stacking and unloading device according to claim 1, wherein the hook mechanism comprises a hook that swings between a locked position in which it engages with the groove of the pallet and an unlocked position in which it moves away from the groove of the pallet, and a hook actuation part that actsuates the hook, the hook being biased toward the locked position by an elastic body.

6. The pallet stacking and unloading device according to claim 5, wherein the hook of the hook mechanism has an elongated shape and, when in the locked position, forms an acute angle with respect to the loading surface of the pallet stacking device which faces vertically, and faces diagonally upward.

7. In a pallet stacking device installed on a lifting trolley of a pallet stacking and unloading device that stacks and unloads pallets having grooves, The pallet loading device is swingable relative to the lifting trolley, A pallet loading device having a hook mechanism that engages with the groove of the pallet.

8. The pallet stacking device according to claim 7, wherein the groove of the pallet is formed on the upper or lower surface of the pallet, or extends through the pallet from the upper surface to the lower surface.

9. The pallet loading device according to claim 7, wherein the pallet loading device swings between a horizontal position and a vertical position.

10. The pallet loading device according to claim 7 or 9, comprising a fixed part fixed on the lifting trolley and a pallet loading device body that is pivotably provided with respect to the fixed part.

11. The pallet loading device according to claim 7, wherein the hook mechanism includes a hook that swings between a locked position in which it engages with the groove of the pallet and an unlocked position in which it moves away from the groove of the pallet, and a hook actuation part that actsuates the hook, and the hook is biased toward the locked position by an elastic body.

12. The pallet loading device according to claim 11, wherein the hook of the hook mechanism has an elongated shape and, when in the locked position, forms an acute angle with respect to the loading surface of the pallet loading device which faces vertically, and faces diagonally upward.

Images