Clamping and fixing device for freeze-drying skip car in refrigeration house

Abstract

The invention provides a clamping and fixing device for a freeze-drying skip car in a refrigeration house, which comprises a fixed seat as a mounting carrier; the material pressing assembly comprises a pull rod which is movably connected to the fixing base and can move up and down, a pressing block which is arranged on the fixing base in a sliding fit mode and can move in the direction close to or away from the working area, and a connecting rod hinged between the pull rod and the pressing block, and an operation part is arranged on the pull rod; the operation part is used for pushing the pull rod to move up and down so as to drive the pressing block to slide in the direction close to or away from the working area; when the pull rod moves to a lower limit position, the pressing block moves to an outer limit position and can tightly press the skip car, at the moment, the length direction of the connecting rod is parallel to the sliding direction of the pressing block, and self-locking is achieved. According to the clamping and fixing device for the freeze-drying skip car in the refrigeration house, the structure is compact, rapid pressing and loosening of the skip car can be achieved, the stability of the skip car in the freeze-drying state is improved, and then the freeze-drying production quality is improved.

Description

Technical Field

[0001] The invention relates to a clamping and fixing device, in particular to a clamping and fixing device used for a freeze-drying material vehicle in a cold storage. Background Art

[0002] A fan is usually installed in the cold storage of the freeze-drying equipment to ensure air circulation during the cooling process. However, the operation of the fan may cause the material cart to shake slightly, thereby affecting the stability of the material and even causing material loss. In the prior art, there is a lack of a clamping device that can effectively fix the material cart in a freezing environment. Summary of the invention

[0003] Technical issues to be solved

[0004] The technical problem to be solved by the present invention is to provide a clamping and fixing device for a freeze-drying material cart in a cold storage, which has a compact structure, is easy to operate and labor-saving, has a high clamping force, a good fixing effect and a self-locking function.

[0005] Technical solutions to the problem

[0006] The present invention provides a clamping and fixing device for a freeze-drying material cart in a cold storage, comprising:

[0007] The fixing seat 1, as a mounting carrier, is used to be mounted to the edge of the working area of ​​the material truck in the cold storage;

[0008] The pressing assembly includes a pull rod 2 movably connected to the fixing seat 1 and capable of moving up and down, a pressing block 5 slidably mounted on the fixing seat 1 and capable of moving toward or away from the working area, and a connecting rod 4 hinged between the pull rod 2 and the pressing block 5. The pull rod 2 is provided with an operating part, and the operating part is used to push the pull rod 2 to move up and down, thereby driving the pressing block 5 to slide toward or away from the working area.

[0009] When the pull rod moves to the lower limit position, the pressing block 5 moves to the outer limit position and can press the material cart. At this time, the length direction of the connecting rod 4 is parallel to the sliding direction of the pressing block 5 and realizes self-locking.

[0010] Furthermore, it also includes an elastic pressing component 3 which contacts the side wall of the pull rod 2 and provides a supporting force when locking.

[0011] Furthermore, the elastic pressing assembly is located on the extension line of the connecting rod 4 .

[0012] Furthermore, the elastic pressing assembly 3 includes a pressing wheel 31 in contact with the side wall of the pull rod 2 and an elastic component 33 that makes the pressing wheel 31 tend to move toward the pull rod 2 and makes the pressing wheel 31 fit the side wall of the pull rod.

[0013] Furthermore, the elastic component 33 is a compression spring.

[0014] Furthermore, a support seat 14 is fixed to the end of the fixing seat 1 , the elastic pressing assembly 3 is mounted on the support seat 14 , and a limiting mechanism for limiting the stroke of the pressing wheel 31 is provided on the support seat 14 .

[0015] Furthermore, an installation cavity is formed on the support seat 14, which is facing the pull rod 2 and is used to install the elastic clamping assembly 3. The side wall of the installation cavity is symmetrically provided with a first guide groove 140, and the first guide groove 140 is strip-shaped and its length direction is parallel to the sliding direction of the pressure block 5; the main shaft 311 of the pressure wheel 31 is sleeved in the first guide groove 140 and can achieve horizontal sliding, and the elastic component 33 is connected to the main shaft 311 through a pressure wheel seat 32 and makes the pressure wheel 31 tend to move closer to the pull rod.

[0016] Furthermore, a limiting rod 321 parallel to the length direction of the first guide slot 140 is provided at the end of the pressure wheel seat 32, and a limiting guide hole 141 for allowing the limiting rod 321 to pass through and achieve limiting is opened on the support seat 14.

[0017] Furthermore, the support seat 14 is U-shaped.

[0018] Furthermore, spring seats are provided at both ends of the elastic component 33 .

[0019] Furthermore, a U-shaped or V-shaped opening facing the pressing wheel 31 and capable of receiving the main shaft is formed at the end of the pressing wheel seat 32 to form a main shaft mounting groove.

[0020] Furthermore, the operating part includes a handle 221 arranged at the upper end of the pull rod 2 and used to pull it upward and unlock it, and a pedal 23 arranged at the lower end of the pull rod 2 and used to push it downward and lock it. The pedal 23 serves as a counterweight block of the pull rod and lowers the center of gravity of the pull rod 2.

[0021] Furthermore, a guide wheel 231 is provided at the lower end of the pull rod 2. The guide wheel contacts the side wall of the fixing seat to form rolling friction and serves as a fulcrum for the deflection of the pull rod when in the locked state.

[0022] Furthermore, a strip-shaped guide groove 21 a is formed on the side wall of the pull rod 2 along the length direction and faces the pressure wheel 31 . The pressure wheel 31 is located in the strip-shaped guide groove 21 a and can limit the radial position of the pull rod 2 .

[0023] Furthermore, the pull rod 2 includes a pull rod body 21 and a mounting seat 22 disposed at the upper end of the pull rod body 21 and facing the pressing block, and an end of the mounting seat 2 is hinged to the connecting rod 4 .

[0024] Furthermore, the pull rod body 21 includes a strip-shaped plate-like body, and the two side edges of the plate-like body are bent away from the direction of the pressure block to form a first connecting part 211, and the edges of the two first connecting parts are bent toward each other by 90 degrees to form a second connecting part 212. There is a spacing between the two second connecting parts to form a strip guide groove 21a, and the depth of the strip guide groove 21a is less than the radius of the pressure wheel.

[0025] Furthermore, a vertically arranged sleeve 13 is fixed to the side wall of the fixed seat 1, a support seat 14 is fixed to the end of the sleeve 13, and the pull rod 2 is sleeved in the sleeve 13 and realizes a movable connection, and the movable connection includes up and down movement and movement or deflection in a direction close to or away from the pressure block.

[0026] Furthermore, the sleeve 13 and the pull rod 2 are both rectangular, and the width of the inner hole of the sleeve 13 is greater than the width of the pull rod.

[0027] Furthermore, a hole 130 is formed on the side wall of the sleeve 13 to accommodate the pedal and provide space for the pedal to move up and down.

[0028] Furthermore, a bracket seat 15 is fixed on the top of the fixing seat 1 , and the pressing block is slidably fitted in the bracket seat 15 .

[0029] Furthermore, the fixing seat 1 includes a horizontally arranged crossbeam 11 and a longitudinal beam 12 vertically arranged at the end of the crossbeam 11 .

[0030] Furthermore, when locked, F1, F2 and F3 are coaxial, wherein F1 is the pressure generated by the pressure wheel on the side wall of the pull rod, F2 is the pressure generated by the pull rod on the connecting rod, and F3 is the pressure generated by the connecting rod on the pressure block.

[0031] Furthermore, L1-L2>ΔL,

[0032] Wherein, L1 is the distance between the two hinges of the connecting rod, L2 is the projection length of the two hinges of the connecting rod in the direction parallel to the movement of the pressing block when the pressing block is at point S, point S is an arbitrary point, and ΔL is the distance from point S to the front stop point.

[0033] Furthermore, ΔL<S1,

[0034] Wherein, S1 is the movable stroke of the pressing wheel on the elastic pressing assembly.

[0035] Furthermore, when point S is the rear dead center, 2mm≤(L1-L2)-ΔL≤8mm.

[0036] Beneficial Effects

[0037] The clamping and fixing device for the freeze-drying material cart in the cold storage is arranged at one side of the working area of ​​the material cart, and can stably clamp the material cart to ensure that it is not affected by displacement during the freeze-drying process, thereby improving the freeze-drying efficiency and product quality; a pull rod structure is adopted, and an operating part is equipped, which can realize rapid clamping and unlocking by hand pulling and foot pedaling, and the operation is convenient and labor-saving, thereby improving the clamping and loosening efficiency of the material cart, and having a good feel and effect in use; an elastic clamping component is arranged to form elastic clamping, thereby improving the clamping strength, and at the same time realizing automatic compensation for errors, thereby avoiding errors caused by processing and assembly. The fit between the pressing block and the side wall of the material cart is improved, the pressing effect is good, and the application range is wide; the pull rod adopts a sleeve connection, which can realize up and down movement and front and back deflection, has a simple and compact structure, low manufacturing cost, convenient assembly, and is convenient for daily maintenance and maintenance, and has a long service life; the guide groove is provided to improve the pressing reliability of the pressing wheel, and has a guiding effect to avoid left and right deflection, and has good linearity; the clamping and fixing device of the freeze-drying material cart in the cold storage of the present invention has a compact structure, can realize rapid pressing and loosening of the material cart, improve the stability of the material cart in the freeze-drying state, and thus improve the quality of the freeze-drying product. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural schematic diagram of a clamping and fixing device for a freeze-drying material cart in a cold storage according to the present invention;

[0039] Figure 2 It is a schematic diagram of the internal structure of the clamping and fixing device of the present invention used for the freeze-drying material cart in the cold storage;

[0040] Figure 3 It is a cross-sectional view of the clamping and fixing device of the present invention used for the freeze-drying material cart in the cold storage;

[0041] Figure 4 This is a schematic diagram of the locking state of the clamping and fixing device of the present invention for the freeze-drying material cart in the cold storage;

[0042] Figure 5 It is a structural schematic diagram of the unlocked state of the clamping and fixing device of the present invention used for the freeze-drying material cart in the cold storage;

[0043] Figure 6 It is a cross-sectional view of the unlocked state of the clamping and fixing device of the present invention used for the freeze-drying material cart in the cold storage;

[0044] Figure 7 This is a schematic diagram of the unlocking state of the clamping and fixing device of the present invention for the freeze-drying material cart in the cold storage;

[0045] Figure 8 It is a schematic diagram of the exploded structure of the clamping and fixing device of the present invention used for the freeze-drying material cart in the cold storage;

[0046] Fig. 9 It is a structural schematic diagram of the elastic pressing assembly of the clamping and fixing device of the freeze-drying material cart in the cold storage of the present invention;

[0047] Fig.10 It is a schematic diagram of the internal structure of the elastic pressing assembly of the clamping and fixing device for the freeze-drying material cart in the cold storage of the present invention;

[0048] Fig.11 It is a schematic diagram of the exploded structure of the elastic pressing assembly of the clamping and fixing device of the freeze-drying material cart in the cold storage of the present invention;

[0049] Fig.12 It is a structural schematic diagram of a fixing seat of a clamping and fixing device for a freeze-drying material cart in a cold storage according to the present invention;

[0050] Fig.13 It is a schematic structural diagram of a pull rod of a clamping and fixing device for a freeze-drying material cart in a cold storage according to the present invention;

[0051] Fig.14 for Fig.13 Enlarged view of part A in the middle;

[0052] Fig.15 It is a schematic diagram of the installation of the guide wheel of the clamping and fixing device of the freeze-drying material cart in the cold storage of the present invention;

[0053] Fig.16 It is a structural schematic diagram of a mounting seat of a clamping and fixing device for a freeze-drying material cart in a cold storage according to the present invention;

[0054] Fig.17 It is a structural schematic diagram of a connecting rod of a clamping and fixing device for a freeze-drying material cart in a cold storage according to the present invention;

[0055] Fig.18 It is a structural schematic diagram of a bracket seat of a clamping and fixing device for a freeze-drying material cart in a cold storage according to the present invention;

[0056] Fig.19 The present invention is a schematic structural diagram of a pressing block of a clamping and fixing device for a freeze-drying material cart in a cold storage. DETAILED DESCRIPTION

[0057] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0058] See also Figure 1-Figure 19 The present invention provides a clamping and fixing device for a freeze-drying material cart in a cold storage, which is used to fix the material cart in the cold storage to prevent the operation of the fan in the cold storage from causing slight shaking of the material cart, thereby affecting the stability of the material and even causing material loss. The device includes a fixing seat 1 and a material pressing assembly.

[0059] The fixing seat 1 is used as a mounting carrier for mounting the material pressing assembly. At the same time, the fixing seat 1 is used to be mounted to the edge of the working area of ​​the material truck in the cold storage. In this embodiment, the fixing seat 1 includes a horizontally arranged crossbeam 11 and a longitudinal beam 12 vertically arranged at the end of the crossbeam 11. The crossbeam 11 and the longitudinal beam 12 form an inverted L-shaped structure. In this application, the crossbeam 1 and the longitudinal beam 12 are made of rectangular profiles or square tubes.

[0060] The material pressing assembly includes a pull rod 2, a pressing block 5 and a connecting rod 4, wherein the pressing block 5 is slidably mounted on the upper end of the fixed seat 1 (crossbeam), and can move toward or away from the working area of ​​the material car. In the present application, its sliding direction is parallel to the length direction of the crossbeam 11. Therefore, in the present embodiment, the pressing block 5 is horizontally slidably mounted on the upper surface of the crossbeam; specifically, a bracket seat 15 is fixed on the top of the crossbeam 11 of the fixed seat 1, and the pressing block 5 is slidably mounted in the bracket seat 15, see Fig.18 The bracket seat 15 includes a sheet-like bracket seat body 151 fixed on the top of the fixing seat 1, and the two sides of the bracket seat body 151 are bent upward by 90 degrees to form side plates 152. Second guide grooves 150 are opened on the two side plates. The second guide grooves 150 are strip-shaped, and their length direction is parallel to the length direction of the crossbeam. The pressing block 5 is rectangular, which is located between the two side plates 151, and its outer wall contacts the inner wall of the side plate, and the bottom surface is in contact with the top surface of the bracket seat body 151 to achieve sliding fit. A first pin shaft 62 is provided on the pressing block 5, and the first pin shaft is sleeved in the second guide groove 150 to achieve sliding limit of the pressing block 5; the pressing block 5 is rectangular as a whole, and is made of profiles. The two sides of the pressing block 5 extend axially to form a first lug 51, and the first lugs 51 are formed on the two first lugs. A first axial hole is provided between the ears 51, and a first pin shaft 62 is sleeved in the first axial hole. Both ends of the first pin shaft 62 are located in the second guide groove to achieve sliding fit; when located at the outer limit position (outer stop point), the end of the pressure block 5 is located outside the crossbeam, which forms a clamping surface for clamping the material cart in the working area of ​​the material cart. In order to increase the clamping force and achieve soft contact at the same time, a rubber pad is provided at the end of the pressure block 5, which can effectively reduce direct metal contact with the material cart, reduce wear, and increase stability during clamping; in the present application, when the pressure block is in contact with the material cart, that is, when the pressure block is located at the front stop point, there may be a certain gap between the first pin shaft and the front end of the second guide groove, which can enable the pressure block 5 to have a compensation function to adapt to the deviation in the width of the material cart and improve the clamping effect. During the sliding process of the pressure block 5, the first pin shaft 62 moves in the second guide groove 150 to achieve precise positioning of the position of the pressure block 5, ensuring its smooth sliding and avoiding jumping; in addition, the rectangular design of the pressure block 5 keeps the friction between it and the bracket seat 15 uniform during the sliding process, effectively reducing the sliding resistance.

[0061] The pull rod 2 is movably connected to the fixed seat 1, and can move up and down, and can also achieve a certain degree of horizontal (forward and backward) movement or (forward and backward) swing. Its movement direction is parallel to the sliding direction of the slider. One end of the connecting rod 4 is hinged on the pull rod 2, and the other end is hinged to the pressure block 5. Specifically, both ends of the connecting rod 4 extend axially outward and form a second lug 42 and a third lug 41 respectively. A second axial hole for installing the first pin 62 is opened on the second lug 42. Therefore, the second lug 42 is hinged to the pressure block 5 through the first pin 62, and a third axial hole is opened on the third lug 41. The axis of the third axial hole is parallel to the axis of the second axial hole. The third axial hole is used to install the second pin 61, which is used for hinged connection with the pull rod 2, so that the connecting rod 4 can rotate flexibly. An operating part is provided on the pull rod 2, and the operating part is used to push the pull rod 2 to move up and down, and then drive the pressure block 5 to slide in a direction close to or away from the working area through the connecting rod 4, thereby realizing tightening (locking) or loosening.

[0062] In the present application, the pull rod 2 includes a pull rod body 21 and a mounting seat 22 arranged at the upper end of the pull rod body 21 and facing the pressure block, thereby forming an inverted L-shaped structure. The mounting seat 22 is rectangular, and its length direction is parallel to the length direction of the beam. The end of the mounting seat 22 is hinged to the connecting rod 4. Specifically, the head of the mounting seat 22 is fixed to the side wall of the pull rod body 21 by welding, and its top surface is flush with the top surface of the pull rod body 21. The tail of the mounting seat 22 extends axially to form a fourth lug 222. A fourth axial hole is opened on the fourth lug 222 for installing a second pin 61, that is, the mounting seat 22 is hinged to the connecting rod through the second pin 61; therefore, the above-mentioned pull rod 2, connecting rod 4 and pressure block 5 can be linked;

[0063] When the pull rod moves to the lower limit position, the pressure block 5 moves to the outer limit position, which is also called the outer stop point. The pressure block can press the material cart. At this time, the length direction of the connecting rod 4 is parallel to the sliding direction of the pressure block 5 to achieve self-locking; in this embodiment, the lower end of the mounting seat 22 and the lower end of the connecting rod 4 are in contact with the upper surface of the beam, and they are located on the same straight line.

[0064] In order to make the operation smoother and improve the clamping force and clamping stability, form elastic clamping and realize gap compensation, the present application also includes an elastic clamping component 3, which can contact the side wall of the pull rod 2, and generate a thrust toward the direction of the pressure block on the side wall of the pull rod, thereby providing support force and realizing gap compensation during locking; the elastic clamping component is located on the extension line of the connecting rod 4. In this embodiment, when locking (clamping), F1, F2 and F3 are coaxial, wherein F1 is the pressure generated by the pressure wheel of the elastic clamping component on the side wall of the pull rod, F2 is the pressure generated by the pull rod on the connecting rod, and F3 is the pressure generated by the connecting rod on the pressure block, and the clamping surface of the pressure block is perpendicular to the sliding direction of the pressure block, therefore, the pressure generated by the pressure block on the trolley is also coaxial with the above-mentioned F1, F2 and F3.

[0065] In this embodiment, the elastic clamping assembly 3 includes a pressure wheel 31 and an elastic component 33, wherein the pressure wheel 31 contacts the side wall of the pull rod 2, and the rotation axis of the pressure wheel 31 is perpendicular to the moving direction of the pull rod, that is, parallel to the axis of the second pin shaft 61, and the elastic component 33 is a compression spring, which makes the pressure wheel 31 tend to move toward the pull rod 2, and makes the pressure wheel 31 fit the elastic component 33 of the side wall of the pull rod, thereby generating a force on the pull rod in the direction of the pressure block, and pressing the side wall of the pull rod when locking, thereby generating a thrust on the pressure block, thereby realizing self-locking clamping.

[0066] To facilitate installation, in the present application, a vertically arranged sleeve 13 is fixed to the side wall of the fixed seat 1. The sleeve 13 is a rectangular hollow tube body. A support seat 14 is fixed to the upper end of the sleeve 13. The pull rod 2 is also a rectangular tube structure, and the (front and back) width of the inner hole of the sleeve 13 is greater than the (front and back) width of the pull rod 2. The above width refers to the dimension parallel to the length direction of the second guide groove 150. The pull rod 2 is sleeved in the sleeve 13 and realizes a movable connection. The movable connection includes up and down movement and movement or deflection in the direction close to or away from the pressure block, providing a slight deflection rotation space for the pull rod when locked; the left and right sides of the pull rod 2 (both sides parallel to the axis direction of the pressure wheel) are in contact with the inner wall of the sleeve to realize limiting and prevent the pull rod from deflecting left and right. The left and right directions refer to the directions parallel to the axis of the pressure wheel.

[0067] The elastic pressing assembly 3 is installed on the support seat 14, and its lower end is fixed to the top of the sleeve 13, and the open end end is fixed to the end of the crossbeam. A limiting mechanism for limiting the stroke of the pressure wheel 31 is provided on the support seat 14; specifically, an installation cavity facing the pull rod 2 and used for installing the elastic pressing assembly 3 is formed on the support seat 14, and a first guide groove 140 is symmetrically opened on the side wall of the installation cavity. The first guide groove 140 is strip-shaped, and its length direction is parallel to the sliding direction of the pressure block 5; in this embodiment, the installation seat 14 is stamped and formed by a steel plate to form a U-shaped structure, and its open end faces the pressure block to form a mounting cavity, and the main shaft 311 of the pressure wheel 31 is sleeved in the first guide groove 140, which can realize horizontal sliding, and the elastic component 33 is connected to the main shaft 311 through a pressure wheel seat 32, and makes the pressure wheel 31 have a movement tendency to approach the pull rod; in order to improve the operating reliability and stability of the pressure wheel and ensure the stability of its horizontal movement, in this application, at the end of the pressure wheel seat 32 A limiting rod 321 is provided, and the axis of the limiting rod 321 is parallel to the length direction of the first guide groove 140. At the same time, a limiting hole 141 is provided on the support seat 14, and the limiting hole can allow the limiting rod 321 to pass through, thereby realizing the movement limitation of the pressure wheel seat, ensuring its horizontal sliding and avoiding deflection; the pressure wheel seat 32 is also a U-shaped structure, and a U-shaped or V-shaped opening facing the pressure wheel 31 is provided at the end of the pressure wheel seat 32, which can allow the main shaft to be inserted to form a main shaft installation groove, which can realize fast loading and unloading and is convenient for maintenance, and at the same time can avoid interference with the pull rod; spring seats are provided at both ends of the elastic component 33, and the above-mentioned elastic component 33 is sleeved outside the limiting rod 321, and the spring seat includes a first seat body 341 and a second seat body 342 located at both ends of the compression spring, and the first seat body and the second seat body are circular rings, and their edges are bent toward each other to form a spring installation area, which can improve the stability of the spring installation, avoid radial deviation, and ensure stable spring force.

[0068] The operating part includes a handle 221 and a pedal 23, wherein the handle 221 is arranged at the upper end of the pull rod 2, and is used to pull it upward to achieve unlocking. In this embodiment, the handle is arranged on the mounting seat 22, and is close to the hinged end with the connecting rod, so that the force arm can be reduced when pulling upward, making the operation easier and more labor-saving; the pedal 23 is arranged at the lower end of the pull rod 2, and is used to push it to move downward to achieve locking (tightening). During operation, the pedal 23 is stepped on by the foot to drive the connecting rod downward through the pull rod, which is convenient to operate and saves labor; at the same time, the pedal 23 serves as a counterweight block of the pull rod, which can lower the center of gravity of the pull rod 2 and ensure its stable up and down movement; a hole 130 is opened on the side wall of the sleeve 13 to accommodate the pedal and provide space for its up and down movement.

[0069] A guide wheel 231 is provided at the lower end of the pull rod 2. The guide wheel contacts the side wall of the fixed seat to form rolling friction, which can reduce the friction of the pull rod moving up and down. In this embodiment, the guide wheel 231 can contact the inner wall of the sleeve; at the same time, the guide wheel 231 serves as a fulcrum for the deflection of the pull rod when it is locked, thereby avoiding rigid friction between the lower end of the pull rod and the fixed seat, thereby improving the overall smoothness of use; at the same time, a strip guide groove 21a is provided on the side wall of the pull rod 2. The length direction of the strip guide groove 21a is parallel to the length direction of the pull rod 2, and its opening direction is toward the pressure wheel 31. The pressure wheel 31 is located in the strip guide groove 21a, which reduces the elastic pressure The axial installation space of the tightening component can be limited radially at the same time to prevent the pull rod 2 from deflecting left or right. The left or right deflection refers to the direction parallel to the axis of the pressure wheel, which improves the linearity of the pull rod; specifically, the pull rod body 21 includes a strip-shaped plate-like body, and the two side edges of the plate-like body are bent 90 degrees away from the direction of the pressure block to form a first connecting part 211. The edges of the two first connecting parts are bent 90 degrees toward each other to form a second connecting part 212. There is a spacing between the two second connecting parts to form a strip guide groove 21a. The depth of the strip guide groove 21a is less than the radius of the pressure wheel. The working surface of the pressure wheel can contact the plate-like body to form rolling friction.

[0070] In this embodiment, L1-L2>ΔL, where L1 is the distance between the two hinges of the connecting rod, L2 is the projection length of the two hinges of the connecting rod in the direction parallel to the moving direction of the pressing block when the pressing block is at the S point, and L2=cosα*L1, where α is the angle between the connecting rod and the horizontal plane at the S point, the S point is an arbitrary point, and ΔL is the distance between the S point and the front stop point;

[0071] When point S is the rear stop point (rear limit position), that is, the pressure block is in the rear limit position, the pull rod is in the upper limit position. At this time, the angle between the connecting rod and the horizontal plane is the largest, L1-L2>ΔL. At this time, ΔL is the difference between the front and rear stop points (limit positions) of the slider. When in the locked (clamped) state, since the increment of the connecting rod in the horizontal direction is greater than the movement stroke of the pressure block, the pull rod will move slightly backward. Since the overall center of gravity of the pull rod is downward, the lower end of the pull rod acts as a fulcrum, and its upper end has a slight outward (rear) deflection, that is, deflection toward the pressure wheel. Therefore, the elastic component is compressed to form a clamping force to achieve the clamping of the pressure block. At the same time, the force of the connecting rod and the pressure block is coaxial, so no power arm is generated, forming a self-locking; in order to improve the reliability and stability of the clamping force, in this embodiment, when point S is the rear stop point, 2mm≤(L1-L2)-ΔL≤8mm, that is, from unlocking (the pressure block retreats to the rear limit position) to the clamping state, the horizontal increment of the connecting rod is greater than or equal to 2mm and less than or equal to 8mm, which represents the horizontal movement of the pressure wheel, that is, the compression of the elastic component; in this application, ΔL<S1, wherein S1 is the movable stroke of the pressure wheel on the elastic clamping assembly, which ensures that the pressure wheel has sufficient movement stroke to avoid the problem of poor operation caused by the limit position.

[0072] In order to achieve a better clamping effect, in the present application, the front stop point is the point where the pressure block is in contact with the trolley, and the limiting point of the pressure block by the second guide groove 150 on the bracket seat body is located at a more front end of the point. For example, the point where the pressure block is in contact with the trolley is point A, and when there is no trolley, the point where the pressure block is located at the front end is point B. Point B can coincide with point A. Preferably, point B is located at the front end of point A. When locked, since the pressure block can slide freely, the horizontal increment of the connecting rod is equal to the horizontal movement distance of the pressure block. When the pressure block and the trolley first come into contact, the pressure block cannot continue to move forward. At this time, the pull rod is not at the lowest end. Preferably, at this time, the angle between the connecting rod and the horizontal plane is 5°-15 degrees, and there is still room for it to fall. Therefore, it can continue to move downward. At this time, since the pressure block cannot move, the horizontal increment of the connecting rod when it moves downward is The amount will cause the upper end of the pull rod to tilt backward, thereby causing the rear end spring to deform. When it is at the lower limit position, the deformation is the largest, that is, the clamping force is the largest, and self-locking is achieved; at this time, for L1-L2>ΔL, L1 is the distance between the two hinges of the connecting rod, and L2 is the projection length of the two hinges of the connecting rod in the direction parallel to the movement of the pressing block when the pressing block is at point S. The L2=cosα*L1, wherein α is the angle between the connecting rod and the horizontal plane at point S, and the S point is the point when the pressing block just contacts the trolley, that is, it contacts the trolley and does not generate pressure on the trolley. ΔL is the distance between point S and the front stop point, and ΔL is 0 at this time. At the same time, there is still an angle of 5-15 degrees between the connecting rod and the horizontal plane at this moment, that is, the connecting rod is not parallel to the sliding direction of the pressing block at this moment, and it still has space to move downward (rotate), and this rotation space can be converted into the compression of the elastic component.

[0073] The clamping and fixing device for the freeze-drying material cart in the cold storage is arranged at one side of the working area of ​​the material cart, and can stably clamp the material cart to ensure that it is not affected by displacement during the freeze-drying process, thereby improving the freeze-drying efficiency and product quality; a pull rod structure is adopted, and an operating part is equipped, which can realize rapid clamping and unlocking by hand pulling and foot pedaling, and the operation is convenient and labor-saving, thereby improving the clamping and loosening efficiency of the material cart, and having a good feel and effect in use; an elastic clamping component is arranged to form elastic clamping, thereby improving the clamping strength, and at the same time realizing automatic compensation for errors, thereby avoiding errors caused by processing and assembly. The fit between the pressing block and the side wall of the material cart is improved, the pressing effect is good, and the application range is wide; the pull rod adopts a sleeve connection, which can realize up and down movement and front and back deflection, has a simple and compact structure, low manufacturing cost, convenient assembly, and is convenient for daily maintenance and maintenance, and has a long service life; the guide groove is provided to improve the pressing reliability of the pressing wheel, and has a guiding effect to avoid left and right deflection, and has good linearity; the clamping and fixing device of the freeze-drying material cart in the cold storage of the present invention has a compact structure, can realize rapid pressing and loosening of the material cart, improve the stability of the material cart in the freeze-drying state, and thus improve the quality of the freeze-drying product.

[0074] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A clamping and fixing device for a freeze-drying material cart in a cold storage, characterized in that: include: The fixing seat 1, as a mounting carrier, is used to be mounted to the edge of the working area of ​​the material truck in the cold storage; The material pressing assembly comprises a pull rod 2 movably connected to the fixing seat 1 and capable of moving up and down, a pressing block 5 slidably mounted on the fixing seat 1 and capable of moving toward or away from the working area, and a connecting rod 4 hinged between the pull rod 2 and the pressing block 5, wherein the pull rod 2 is provided with an operating part, and the operating part is used to push the pull rod 2 to move up and down, thereby driving the pressing block 5 to slide toward or away from the working area; When the pull rod moves to the lower limit position, the pressing block 5 moves to the outer limit position and can press the material cart. At this time, the length direction of the connecting rod 4 is parallel to the sliding direction of the pressing block 5 and realizes self-locking.

2. The clamping and fixing device for a freeze-drying material cart in a cold storage as claimed in claim 1, characterized in that: It also includes an elastic clamping assembly 3 which contacts the side wall of the pull rod 2 and generates a thrust on the side wall of the pull rod toward the pressure block when locked; the elastic clamping assembly 3 includes a pressure wheel 31 which contacts the side wall of the pull rod 2 and an elastic component 33 which makes the pressure wheel 31 tend to move toward the pull rod 2 and makes the pressure wheel 31 fit the side wall of the pull rod.

3. The clamping and fixing device for a freeze-drying material cart in a cold storage as claimed in claim 2, characterized in that: A support seat 14 is fixed to the end of the fixing seat 1 , the elastic pressing assembly 3 is mounted on the support seat 14 , and a limiting mechanism for limiting the stroke of the pressing wheel 31 is provided on the support seat 14 .

4. The clamping and fixing device for a freeze-drying material cart in a cold storage as claimed in claim 3, characterized in that: The support seat 14 is formed with an installation cavity facing the pull rod 2 and used to install the elastic clamping assembly 3. The side wall of the installation cavity is symmetrically provided with a first guide groove 140. The first guide groove 140 is strip-shaped and its length direction is parallel to the sliding direction of the pressure block 5. The main shaft 311 of the pressure wheel 31 is sleeved in the first guide groove 140 and can achieve horizontal sliding. The elastic component 33 is connected to the main shaft 311 through a pressure wheel seat 32 and makes the pressure wheel 31 tend to move closer to the pull rod.

5. The clamping and fixing device for a freeze-drying material cart in a cold storage as claimed in claim 4, characterized in that: A limiting rod 321 parallel to the length direction of the first guide slot 140 is disposed at the end of the pressure wheel seat 32 , and a space for accommodating the limiting rod 321 is provided on the support seat 14 .

6. The clamping and fixing device for a freeze-drying material cart in a cold storage as claimed in claim 1, characterized in that: The operating part includes a handle 221 arranged at the upper end of the pull rod 2 and used to pull it upward and unlock it, and a pedal 23 arranged at the lower end of the pull rod 2 and used to push it downward and lock it. The pedal 23 serves as a counterweight block of the pull rod and lowers the center of gravity of the pull rod 2.

7. The clamping and fixing device for a freeze-drying material cart in a cold storage as claimed in claim 1, characterized in that: A guide wheel 231 is provided at the lower end of the pull rod 2. The guide wheel contacts the side wall of the fixing seat to form rolling friction and serves as a fulcrum for the deflection of the pull rod when in a locked state.

8. The clamping and fixing device for a freeze-drying material cart in a cold storage as claimed in claim 1, characterized in that: A vertically arranged sleeve 13 is fixed to the side wall of the fixing seat 1, a support seat 14 is fixed to the end of the sleeve 13, and the pull rod 2 is sleeved in the sleeve 13 and realizes a movable connection, wherein the movable connection includes up and down movement and movement or deflection in a direction close to or away from the pressing block.

9. The clamping and fixing device for a freeze-drying material cart in a cold storage as claimed in claim 1, characterized in that: When locked, F1, F2 and F3 are coaxial, among which F1 is the pressure generated by the pressure wheel on the side wall of the pull rod, F2 is the pressure generated by the pull rod on the connecting rod, and F3 is the pressure generated by the connecting rod on the pressure block.

10. The clamping and fixing device for freeze-drying material carts in cold storage as claimed in claim 1, characterized in that: L1-L2>ΔL, Wherein, L1 is the distance between the two hinges of the connecting rod, L2 is the projection length of the two hinges of the connecting rod in the direction parallel to the movement of the pressing block when the pressing block is at point S, point S is an arbitrary point, and ΔL is the distance from point S to the front stop point.

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