Base for movable speed reducer

Abstract

The utility model provides a base for a movable speed reducer, which belongs to the technical field of speed reducers and comprises a base body in sliding connection with the speed reducer through a sliding mechanism. The hydraulic driving mechanism is fixedly mounted on the base body, and the hydraulic driving mechanism is fixedly connected with the speed reducer through the connecting mechanism; the connecting mechanism drives the speed reducer to move under the action of hydraulic thrust of the hydraulic driving mechanism, so that the speed reducer slides along the sliding mechanism. The base for the movable speed reducer has the advantages that the speed reducer is pushed to move in a hydraulic driving mode, flexible movement of the speed reducer among a plurality of stations is achieved, and the requirement that the speed reducer machines different products at different stations is met; in addition, the base is simple in structure, convenient to replace, safe and reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of speed reducers, in particular to a base for a movable speed reducer. Background Art

[0002] A speed reducer plays a role in matching speeds and transmitting torques between a prime mover and a working machine or an actuator. As a relatively precise machine, the purpose of a speed reducer is mainly to reduce the speed and increase the torque, and it is widely used in modern mechanical transmissions.

[0003] When a traditional speed reducer is installed, it is usually fixed on a foundation at a specific position. Once installed and put into use, its position is difficult to change. Although this fixed layout ensures the stable operation of the speed reducer to a certain extent, in the face of scenarios where the position of the working machine is variable or the production line layout needs to be flexibly adjusted, since the speed reducer cannot be directly moved to adapt to working machines at different positions, it is necessary to separately equip each working machine or each working area with a speed reducer, resulting in redundancy and complexity in equipment configuration, increasing the investment cost and the difficulty of later maintenance. Content of the Utility Model

[0004] In order to solve the above technical problems, the utility model provides a base for a movable speed reducer.

[0005] The technical problems solved by the utility model can be realized by adopting the following technical solutions:

[0006] A base for a movable speed reducer includes:

[0007] A base body, the base body is slidably connected with the speed reducer through a sliding mechanism;

[0008] A hydraulic driving mechanism, fixedly installed on the base body, the hydraulic driving mechanism is fixedly connected with the speed reducer through a connecting mechanism;

[0009] Wherein, the connecting mechanism drives the speed reducer to move under the hydraulic thrust of the hydraulic driving mechanism, so that the speed reducer slides along the sliding mechanism.

[0010] Preferably, there are two sliding mechanisms, and the two sliding mechanisms are arranged in parallel;

[0011] The two sliding mechanisms are respectively slidably connected to both sides of the base body and fixedly connected to the bottom plate of the speed reducer.

[0012] Preferably, each sliding mechanism includes:

[0013] Skateboard assembly, the skateboard assembly includes an upper skateboard, side skateboards and a lower skateboard, the upper skateboard and the side skateboards are respectively fixedly connected to the speed reducer, and the lower skateboard is fixedly connected to the bottom of the bottom plate of the speed reducer through a pressing plate;

[0014] On the side of the upper skateboard, the side skateboards and the lower skateboard away from the speed reducer, there are chute grooves;

[0015] On the base body, there are sliders corresponding to the chute grooves, and the sliders are slidably connected to the chute grooves.

[0016] Preferably, on the base body, there are corresponding injection holes for injecting lubricating oil into the chute grooves.

[0017] Preferably, there is a cushion plate between the side skateboard and the speed reducer.

[0018] Preferably, it further includes:

[0019] Adjusting nut, nut and bolt; one end of the bolt is threadedly connected to the adjusting nut, and the other end of the bolt sequentially passes through the bottom plate of the speed reducer, the cushion plate and the side skateboard and is threadedly connected to the nut.

[0020] Preferably, the hydraulic drive mechanism includes:

[0021] Hydraulic cylinder, the piston rod of the hydraulic cylinder is connected to the connecting mechanism;

[0022] The hydraulic cylinder is fixedly installed in the cylinder seat, the cylinder seat is fixedly installed in the fixed seat, and the cylinder seat and the fixed seat are fixedly installed on the base body through the first fasteners.

[0023] Preferably, the connecting mechanism includes:

[0024] Connecting seat, the top of the connecting seat is fixedly connected to the speed reducer through the second fasteners;

[0025] Double ear shaft, the double ear shaft is connected to the hydraulic drive mechanism, and the two single ears of the double ear shaft are connected to the bottom of the connecting seat through pin shafts.

[0026] Preferably, it further includes:

[0027] At least one proximity switch, the at least one proximity switch is respectively arranged on the base body through the proximity switch mounting seat, and the at least one proximity switch is arranged at intervals along the stroke direction of the hydraulic drive mechanism.

[0028] Preferably, there are two proximity switches, and the two proximity switches are respectively arranged at both ends of the stroke of the hydraulic drive mechanism.

[0029] The advantages or beneficial effects of the technical solution of the present utility model are as follows:

[0030] The base for a movable speed reducer proposed by the present utility model drives the movement of the speed reducer by adopting a hydraulic drive method, realizing the flexible movement of the speed reducer among multiple workstations and meeting the requirements of processing different products by the speed reducer at different workstations; in addition, the base has a simple structure, is convenient to replace, and is safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is the front view of the base for a movable speed reducer in the preferred embodiment of the present utility model;

[0032] Figure 2 It is the front view of the base for a movable speed reducer in the preferred embodiment of the present utility model;

[0033] Figure 3 It is the left view of the base for a movable speed reducer in the preferred embodiment of the present utility model;

[0034] Figure 4 It is the right view of the base for a movable speed reducer in the preferred embodiment of the present utility model.

[0035] Description of the reference numerals:

[0036] 1, speed reducer; 2, base body; 3, sliding mechanism; 31, side sliding plate; 32, upper sliding plate; 33, lower sliding plate; 34, pressing plate; 35, third fastener; 36, backing plate; 37, adjusting nut; 38, bolt; 4, hydraulic drive mechanism; 41, hydraulic cylinder; 42, cylinder seat; 43, fixed seat; 44, first fastener; 5, connecting mechanism; 51, double-ear shaft; 52, connecting seat; 53, pin shaft; 54, second fastener; 6, proximity switch; 7, proximity switch mounting seat; 8, fourth fastener. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0038] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments may be combined with each other.

[0039] Next, the present utility model will be further described in conjunction with the accompanying drawings and specific embodiments, but it is not a limitation of the present utility model.

[0040] See Figure 1 、 Figure 2 、 Figure 3 and Figure 4 , in the preferred embodiment of the present utility model, in view of the above problems existing in the prior art, a base for a movable speed reducer is provided, including:

[0041] A base body 2, and the base body 2 is slidably connected to the speed reducer 1 through a sliding mechanism 3;

[0042] A hydraulic driving mechanism 4, fixedly installed on the base body 2, and the hydraulic driving mechanism 4 is fixedly connected to the speed reducer 1 through a connecting mechanism 5;

[0043] Wherein, the connecting mechanism 5 drives the speed reducer 1 to move under the hydraulic thrust of the hydraulic driving mechanism 4, so that the speed reducer 1 slides along the sliding mechanism 3.

[0044] Specifically, for the base for a movable speed reducer proposed in the embodiment of the present utility model, a hydraulic driving mechanism 4 is provided on the base body 2, and the hydraulic driving mechanism 4 is fixedly connected to the speed reducer 1 through a connecting mechanism 5. When the hydraulic driving mechanism 4 works, a thrust is generated under the action of hydraulic oil to push the connecting mechanism 5 to move, so that the connecting mechanism 5 drives the speed reducer 1 to move, and the movement of the speed reducer 1 is realized by means of hydraulic driving.

[0045] At the same time, the speed reducer 1 is slidably connected to the base body 2 through the sliding mechanism 3. During the process of driving the speed reducer 1 to move hydraulically, the speed reducer 1 slides relative to the base body 2 through the sliding mechanism 3, realizing the flexible movement of the speed reducer 1 among multiple workstations and meeting the requirements of the speed reducer 1 for processing different products at different workstations; in addition, the base has a simple structure, is convenient to replace, and is safe and reliable.

[0046] As a preferred embodiment, wherein, there are two sliding mechanisms 3, and the two sliding mechanisms 3 are arranged in parallel;

[0047] The two sliding mechanisms 3 are respectively slidably connected to both sides of the base body 2 and fixedly connected to the bottom plate of the speed reducer 1.

[0048] Specifically, in this embodiment, two sliding mechanisms are provided. The two sliding mechanisms 3 are respectively fixedly connected to the bottom of the speed reducer 1. The two sliding mechanisms 3 are respectively located on both sides of the base body 2, and the two sliding mechanisms 3 are slidably connected to the two ends of the top of the base body 2, so that during the process of driving the speed reducer 1 to move hydraulically, the speed reducer 1 can move along the length direction of the sliding mechanism 3, ensuring the smoothness and reliability of the speed reducer 1 during the movement process.

[0049] As a preferred embodiment, wherein, each sliding mechanism 3 includes:

[0050] Skateboard assembly, the skateboard assembly includes an upper skateboard 32, side skateboards 31 and a lower skateboard 33. The upper skateboard 32 and the side skateboards 31 are respectively fixedly connected to the speed reducer 1, and the lower skateboard 33 is fixedly connected to the bottom of the bottom plate of the speed reducer 1 through a pressing plate 34;

[0051] On one side of the upper skateboard 32, the side skateboards 31 and the lower skateboard 33 away from the speed reducer 1, there are chutes (not shown in the figure);

[0052] On the base body 2, there are sliders corresponding to the chutes (not shown in the figure), and the sliders are slidably connected to the chutes.

[0053] Specifically, for the sliding mechanism on the left side, the left bottom plate of the speed reducer 1 is fixed on the left side of the side skateboard 31 through countersunk head screws, and is fixed on the upper surface of the upper skateboard 32 through countersunk head screws. The lower skateboard 33 is fixed on the pressing plate 34 through countersunk head screws, and the pressing plate 34 is fixed on the bottom of the left bottom plate of the speed reducer 1 through a third fastener 35 (such as a bolt).

[0054] For the sliding mechanism on the right side, the right bottom plate of the speed reducer 1 is fixed on the upper surface of the upper skateboard 32 through countersunk head screws, and is fixed on the right side of the side skateboard 31 through countersunk head screws. The lower skateboard 33 is fixed on the pressing plate 34 through countersunk head screws, and the pressing plate 34 is fixed on the bottom of the right bottom plate of the speed reducer 1 through a third fastener 35 (such as a bolt).

[0055] As a preferred embodiment, there are corresponding injection holes (not shown in the figure) provided on the base body 2, and the injection holes are used to inject lubricating oil into the chutes.

[0056] Specifically, in this embodiment, the side skateboards 31, the upper skateboard 32 and the lower skateboard 33 are respectively provided with chutes. By injecting lubricating oil into the chutes, a grease oil groove is formed, which further improves the smoothness of the sliding process, ensures a stable sliding process without jamming. At the same time, the grease oil groove also has good wear resistance and self-lubrication, reducing friction and wear.

[0057] As a preferred embodiment, there is a spacer 36 provided between the side skateboard 31 and the speed reducer 1.

[0058] Specifically, there is a spacer 36 provided between the side skateboard 31 of one of the two sliding mechanisms and the speed reducer 1. For example, the spacer 36 can be provided between the side skateboard 31 of the left sliding mechanism and the speed reducer 1; or it can also be provided between the side skateboard 31 of the right sliding mechanism and the speed reducer 1.

[0059] As a preferred embodiment, it further includes:

[0060] Adjusting nut 37, nut (not marked in the figure), and bolt 38; one end of bolt 38 is threadedly connected to adjusting nut 37, and the other end of bolt 38 sequentially passes through the bottom plate of speed reducer 1, cushion plate 36, and side sliding plate 31 and is threadedly connected to the nut.

[0061] Specifically, in this embodiment, an adjusting nut 37, a nut, and a bolt 38 are further provided on the right bottom plate of speed reducer 1. Bolt 38 sequentially passes through the right bottom plate of speed reducer 1, cushion plate 36, and the right side sliding plate 3. One end of bolt 38 is threadedly connected to adjusting nut 37, and the other end is threadedly connected to the nut, which is used to adjust the gap between speed reducer 1, cushion plate 36, the side sliding plate 31 of the right sliding mechanism, and the base body 2.

[0062] When the gap needs to be adjusted, rotate adjusting nut 37. The threaded connection between adjusting nut 37 and bolt 38 can increase or decrease the gap between speed reducer 1, cushion plate 36, side sliding plate 31, and base body 2.

[0063] After speed reducer 1 is adjusted to the required position, tighten adjusting nut 37 again to achieve the adjustment of the gap. By using the cooperation of adjusting nut 37 and bolt 38, the gap between speed reducer 1 and base body 2 can be effectively adjusted to ensure the stability of speed reducer 1 and the smoothness of movement.

[0064] Furthermore, a groove is provided on base body 2. Both the hydraulic driving mechanism 4 and the connecting mechanism 5 are arranged in this groove to improve the integration degree and reduce the overall volume.

[0065] Furthermore, the groove is in a long strip shape. The long strip-shaped groove is the thrust stroke range of the hydraulic driving mechanism 4, ensuring that there is enough space for the hydraulic driving mechanism 4 to drive speed reducer 1 to move and enabling it to operate smoothly.

[0066] As a preferred implementation manner, among them, the hydraulic driving mechanism 4 includes:

[0067] Hydraulic cylinder 41, the piston rod of hydraulic cylinder 41 is connected to the connecting mechanism 5;

[0068] Hydraulic cylinder 41 is fixedly installed in cylinder seat 42, cylinder seat 42 is fixedly installed in fixed seat 43, and cylinder seat 42 and fixed seat 43 are fixedly installed on base body 2 through the first fastener 44.

[0069] Specifically, in this embodiment, hydraulic cylinder 41 is fixedly installed with base body 2, that is, hydraulic cylinder 41 is fixed in cylinder seat 42, cylinder seat 42 is fixed in fixed seat 43, and the first fastener 44 (such as a bolt) sequentially passes through cylinder seat 42 and fixed seat 43 and is fixedly installed on base body 2.

[0070] The piston rod of the hydraulic cylinder 41 is fixedly connected to the connecting mechanism 5. The telescopic movement of the piston rod of the hydraulic cylinder 41 drives the movement of the connecting mechanism 5, and further drives the speed reducer 1 to move horizontally along the sliding mechanism 3 on the base body 2, realizing the position adjustment of the speed reducer 1.

[0071] The working process of the hydraulic cylinder 41 hydraulically driving the speed reducer 1 is as follows:

[0072] When the position of the speed reducer 1 needs to be adjusted, the hydraulic system injects hydraulic oil into one side of the piston rod of the hydraulic cylinder 41 to make the piston rod extend. The extension of the piston rod drives the connecting mechanism 5 fixed to it to move together, and the movement of the connecting mechanism 5 further drives the speed reducer 1 to slide along the sliding mechanism 3. When the speed reducer 1 reaches the designated position, the hydraulic system stops injecting oil into the hydraulic cylinder 41 and keeps the position of the speed reducer 1 unchanged.

[0073] If it is necessary to move the speed reducer 1 back to its original position or other positions, the hydraulic system injects hydraulic oil into the other side of the hydraulic cylinder 41 to make the piston rod contract, and repeats the above process until the required position is reached.

[0074] As a preferred embodiment, wherein, the connecting mechanism 5 includes:

[0075] A connecting seat 52, the top of the connecting seat 52 is fixedly connected to the speed reducer 1 through a second fastener 54;

[0076] A double ear shaft 51, the double ear shaft 51 is connected to the hydraulic driving mechanism 4, and the two single ears of the double ear shaft 51 are connected to the bottom of the connecting seat 52 through a pin shaft 53.

[0077] Specifically, the piston rod of the hydraulic cylinder 41 drives the double ear shaft 51 to move under the action of hydraulic oil. The double ear shaft 51 is connected to the connecting seat 52 through a pin shaft 53, and the connecting seat 52 is fixedly connected to the speed reducer 1 through a second fastener 54 (such as a bolt). The movement of the double ear shaft 51 will drive the connecting seat 52 to move, so that the connecting seat 52 drives the speed reducer 1 to move. The movement of the speed reducer is realized by cooperating with the side sliding plate 31, the upper sliding plate 32 and the lower sliding plate 33.

[0078] When the speed reducer 1 reaches the designated position, stop injecting oil into the hydraulic cylinder 41 and keep the position of the speed reducer 1 unchanged. If it is necessary to move the speed reducer 1 back to its original position or other positions, control the telescopic movement of the piston rod of the hydraulic cylinder 4 by hydraulic drive, and repeat the above process until the required position is reached.

[0079] Furthermore, it further includes:

[0080] A stroke monitoring mechanism, which is arranged on the base body 2 and within the stroke range of the hydraulic cylinder 41 to monitor the stroke of the hydraulic cylinder;

[0081] A control mechanism, which is respectively connected to a stroke monitoring mechanism and a hydraulic system of a hydraulic cylinder 41, is used to control the oil injection operation of the hydraulic system; and is used to issue an alarm or automatically stop the action of the hydraulic cylinder when it is detected that the stroke of the hydraulic cylinder exceeds a preset safety range, thereby avoiding accidental injuries caused by excessive stroke of the hydraulic cylinder and improving the safety of operation.

[0082] As a preferred embodiment, wherein, the stroke monitoring mechanism includes:

[0083] At least one proximity switch 6, and at least one proximity switch 6 is respectively arranged on the base body 2 through a proximity switch mounting seat 7, and at least one proximity switch 6 is arranged at intervals along the stroke direction of the hydraulic driving mechanism 4.

[0084] Specifically, the proximity switch 6 can be set to one or more. The specific number of proximity switches 6 can be selected according to actual needs.

[0085] The proximity switch mounting seat 7 is fixed on the base body 2 through a fourth fastener 8 (such as a bolt), and one or more proximity switches 6 are respectively fixed on the base body 2 through the proximity switch mounting seat 7.

[0086] When multiple proximity switches 6 are set, the multiple proximity switches 6 are arranged at intervals along the stroke direction of the hydraulic driving mechanism 4 to monitor the stroke of the hydraulic cylinder.

[0087] As a preferred embodiment, wherein, the proximity switch 6 includes two, and the two proximity switches 6 are respectively arranged at both ends of the stroke of the hydraulic driving mechanism 4.

[0088] Specifically, in this embodiment, the proximity switch 6 can be set to two, and the two proximity switches 6 are respectively arranged at both ends of the stroke of the hydraulic driving mechanism 4, that is, the initial position (the position where the piston rod is retracted to the minimum) and the end position (the position where the piston rod extends to the maximum). When the piston rod of the speed reducer 1 moves to the installation position of the proximity switch 6, the proximity switch 6 at the corresponding position will feedback a signal, and the signal contains the stroke of the hydraulic cylinder.

[0089] When the piston rod is in the starting position, one of the proximity switches 6 senses a specific mark (such as an induction sheet) on the piston rod and issues a signal indicating that the piston rod has reached the starting point.

[0090] As the piston rod extends, when it reaches the end position, the other proximity switch 6 also senses the mark on the piston rod and issues a signal indicating that the piston rod has reached the end point.

[0091] Furthermore, more proximity switches 6 can be arranged at intervals between the initial position and the end position according to needs.

[0092] Furthermore, in order to enhance the fastening and stability of the bolt connection and prevent the bolts from loosening or being damaged, especially in a working environment with long-term operation or large vibrations, washers can be sleeved on the above-mentioned fasteners such as bolts (such as the first fastener 44, the second fastener 54, the third fastener 35, the bolt 38, and the fourth fastener 8). The washer can disperse the pressure generated during bolt fastening, avoid the direct action of the pressure on the surface of the connected part, thereby reducing the damage to the connected part and increasing the reliability of the connection. During the process of tightening the bolt and the nut, the washer can fill the tiny gap between the bolt and the connected part, increase the contact area, and improve the tightness of the connection, thereby effectively preventing the bolt from loosening due to vibrations or other reasons.

[0093] The advantages or beneficial effects of adopting the above technical solution are as follows: The base for the movable speed reducer proposed by the present utility model is composed of several parts such as a base body, a sliding mechanism, a hydraulic driving mechanism, and a connecting mechanism. The structure is relatively simple, and the manufacturing and maintenance costs are relatively low; the speed reducer can be moved a short distance through a simple structure; by adopting a hydraulic driving method to push the speed reducer to move, the flexible movement of the speed reducer between multiple workstations is realized, meeting the requirements of the speed reducer for processing different products at different workstations; by adopting the design of side sliding plates, upper sliding plates, and lower sliding plates, it is easy to replace, improving the efficiency of the speed reducer; by installing proximity switches, the stroke of the hydraulic cylinder can be monitored, and when the stroke exceeds the preset safety range, an alarm can be issued or the action of the hydraulic cylinder can be automatically stopped, effectively avoiding accidental injuries caused by excessive stroke of the hydraulic cylinder and greatly improving the safety of operation.

[0094] The above are only the preferred embodiments of the present utility model, and do not limit the implementation manners and protection scope of the present utility model accordingly. For those skilled in the art, it should be realized that all equivalent replacements and obvious changes made by using the content of this specification and the drawings should be included in the protection scope of the present utility model.

Claims

1. A base for a movable speed reducer, characterized in that, Comprising: A base body, which is slidably connected to a speed reducer through a sliding mechanism; A hydraulic driving mechanism, fixedly installed on the base body, and the hydraulic driving mechanism is fixedly connected to the speed reducer through a connecting mechanism; Wherein, the connecting mechanism drives the speed reducer to move under the hydraulic thrust of the hydraulic driving mechanism, so that the speed reducer slides along the sliding mechanism.

2. The base for a movable speed reducer according to claim 1, characterized in that, There are two sliding mechanisms, and the two sliding mechanisms are arranged in parallel; The two sliding mechanisms are respectively slidably connected to both sides of the base body and fixedly connected to the bottom plate of the speed reducer.

3. The base for a movable speed reducer according to claim 1, characterized in that, Each sliding mechanism includes: A sliding plate assembly, which includes an upper sliding plate, a side sliding plate and a lower sliding plate. The upper sliding plate and the side sliding plate are respectively fixedly connected to the speed reducer, and the lower sliding plate is fixedly connected to the bottom of the bottom plate of the speed reducer through a pressing plate; Chute grooves are provided on the sides of the upper sliding plate, the side sliding plate and the lower sliding plate away from the speed reducer; Sliding blocks corresponding to the chute grooves are provided on the base body, and the sliding blocks are slidably connected to the chute grooves.

4. The base for a movable speed reducer according to claim 3, characterized in that, An injection hole corresponding thereto is provided on the base body, and the injection hole is used to inject lubricating oil into the chute groove.

5. The base for a movable speed reducer according to claim 3, characterized in that, A cushion plate is provided between the side sliding plate and the speed reducer.

6. The base for a movable speed reducer according to claim 5, characterized in that, Also included are: An adjusting nut, a nut and a bolt; One end of the bolt is threadedly connected to the adjusting nut, and the other end of the bolt sequentially passes through the bottom plate of the speed reducer, the cushion plate and the side sliding plate and is threadedly connected to the nut.

7. The base for a movable speed reducer according to claim 1, characterized in that, The hydraulic driving mechanism includes: A hydraulic cylinder, the piston rod of the hydraulic cylinder is connected to the connecting mechanism; The hydraulic cylinder is fixedly installed in a cylinder seat, the cylinder seat is fixedly installed in a fixed seat, and the cylinder seat and the fixed seat are fixedly installed on the base body through a first fastener.

8. The base for a movable speed reducer according to claim 1, wherein The connecting mechanism includes: A connecting seat, the top of the connecting seat is fixedly connected to the speed reducer through a second fastener; A double ear shaft, which is connected to the hydraulic driving mechanism, and the two single ears of the double ear shaft are connected to the bottom of the connecting seat through a pin shaft.

9. The base for a movable speed reducer according to claim 1, characterized in that, Also included are: At least one proximity switch, the at least one proximity switch is respectively arranged on the base body through a proximity switch mounting seat, and the at least one proximity switch is arranged at intervals along the stroke direction of the hydraulic driving mechanism.

10. The base for a movable speed reducer according to claim 9, characterized in that, There are two proximity switches, and the two proximity switches are respectively arranged at both ends of the stroke of the hydraulic driving mechanism.

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