Wood yield strength-based CLT wood structure flexible gluing press and pressing method

Abstract

The invention discloses a CLT wood structure flexible gluing press based on wood yield strength and a pressing method. The CLT wood structure flexible gluing press comprises a hydraulic flow distribution system containing a multi-wood yield strength data set, a first hydraulic transmission assembly, a second hydraulic transmission assembly, a pressing plate and a flexible gluing pressing block. The flexible gluing pressing block comprises a fixed rod, a control rod and a pressing block; a hemispherical convex block at the bottom end of a fixing rod can rotate in a hemispherical groove of a pressing block, a pressure sensor detects the liquid pressure in a second hydraulic transmission assembly, and a controller in a hydraulic flow distribution system supplies flow to the second hydraulic transmission assembly according to the liquid pressure detected by the pressure sensor and the multi-wood yield strength. And it is guaranteed that the pressure of liquid in each second hydraulic transmission assembly is consistent, and meanwhile plastic deformation, caused by too large pressure, of the cross-laminated wood is avoided. By means of the flexible gluing pressing block, the pressing block body can be replaced more conveniently and rapidly, the daily maintenance time and cost are saved, and the phenomenon of pressure leakage can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of plywood presses, in particular to a CLT wood structure flexible gluing press and a pressing method based on wood yield strength. Background Art

[0002] The plywood press is one of the main equipment in the plywood production process. It is mainly used to hot-press and glue the glued slabs. The heating and pressurizing action of the press solidifies the glue, and the layers of the slabs are tightly combined to form a plywood with a certain strength and stability.

[0003] During the operation of the CLT wood structure gluing press, the pressing blocks will be damaged due to long-term use. The connection method between the pressing blocks and the telescopic drive mechanism in the traditional CLT wood structure gluing press is mainly rigid connection such as bolts and nuts, and the workload of replacing the pressing blocks is large and the operation time is long. In addition, when the pressing blocks in the traditional CLT wood structure gluing press are pressed on the orthogonal glued timber with different upper surface heights, the pressing blocks will leak pressure on the parts with slightly lower upper surface heights of the orthogonal glued timber, resulting in insufficient tightness between the slabs, and then the layers of the slabs cannot be tightly combined.

[0004] In view of the above problems, a CLT wood structure flexible gluing press and pressing method based on the yield strength of wood are proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a CLT wood structure flexible gluing press and pressing method based on the yield strength of wood, so as to solve the problems of large workload, long operation time and pressure leakage in replacing pressing blocks proposed in the above background technology.

[0006] In order to achieve the above technical objectives, the technical solution adopted by the present invention is:

[0007] A CLT wood structure flexible gluing press based on wood yield strength, comprising a hydraulic flow distribution system for respectively supplying flow to a hydraulic transmission component 1 and a hydraulic transmission component 2, a hydraulic transmission component 1, a hydraulic transmission component 2, a support frame, a pressing plate and a flexible gluing pressing block;

[0008] The hydraulic transmission component 1 is arranged on the support frame, and the output end of the hydraulic transmission component 1 is connected to the pressing plate;

[0009] A plurality of hydraulic transmission components 2 are arranged on the pressure plate, and the output end of each hydraulic transmission component 2 is connected to the flexible glued pressure block; a pressure sensor is installed in each hydraulic transmission component 2, and each pressure sensor is connected to the hydraulic flow distribution system;

[0010] The flexible glued pressure block comprises a fixing rod, a control rod and a pressure block body, the fixing rod is connected to the output end of the hydraulic transmission component 2, the bottom end of the fixing rod is a hemispherical convex block, the pressure block body is provided with a connecting groove, the bottom wall of the connecting groove is a hemispherical groove, a plurality of through holes are transversely opened in the pressure block body, one end of the through hole penetrates the outer surface of the pressure block body, and the other end is connected to the connecting groove, the control rod is elastically slidably connected inside the through hole, and the end of the control rod extending into the connecting groove forms a certain inclination angle so as to form a convex clamping head at the end; the bottom end of the fixing rod extends into the connecting groove of the pressure block body until the hemispherical convex block is embedded in the hemispherical groove, and the hemispherical convex block can rotate in the hemispherical groove;

[0011] When the raised clamping head of the control rod faces downward, the raised clamping head of the control rod is clamped with the end face of the hemispherical protrusion at the bottom end of the fixed rod; when the raised clamping head of the control rod faces upward, the pressing block body is acted upon by gravity, and the outer spherical surface of the hemispherical protrusion of the fixed rod squeezes the side with an inclined angle on the raised clamping head of the control rod, and the raised clamping head of the control rod slides toward the through hole, and the side with an inclined angle on the raised clamping head slides along the outer spherical surface of the hemispherical protrusion until the hemispherical protrusion at the bottom end of the fixed rod is separated from the hemispherical groove of the pressing block body, and the pressing block body falls off;

[0012] The controller in the hydraulic flow distribution system contains a data set of yield strengths of multiple woods. The pressure sensor is used to detect the liquid pressure in the hydraulic transmission component 2 and send the liquid pressure to the controller in the hydraulic flow distribution system. The controller in the hydraulic flow distribution system replenishes the flow for the hydraulic transmission component 2 according to the liquid pressure detected by the pressure sensor and the yield strengths of multiple woods, thereby ensuring that the liquid pressure in each hydraulic transmission component 2 is consistent and preventing the orthogonal glued timber from being deformed due to excessive liquid pressure in each hydraulic transmission component 2.

[0013] As a further improved technical solution of the present invention, the pressure plate is a several-shaped structure, including a bottom plate and a top plate, the bottom plate is fixedly connected to both sides of the top plate, the bottom plate is connected to the output ends of multiple hydraulic transmission components one, the top plate is connected to multiple hydraulic transmission components two, and the output end of each hydraulic transmission component two passes through the reserved hole on the top plate and is connected to the fixed rod in the flexible glued pressure block connection.

[0014] As a further improved technical solution of the present invention, a plurality of hydraulic transmission components are connected to a support frame, and the support frame is also provided with a base, and the base is used to place the orthogonal glued timber to be pressed, and the pressing plate is located above the base.

[0015] As a further improved technical solution of the present invention, the hydraulic transmission component 1 adopts a hydraulic cylinder 1, and the hydraulic cylinder 1 is connected to the support frame by bolts; the telescopic end of the hydraulic cylinder 1 is connected to the pressure plate by threads.

[0016] As a further improved technical solution of the present invention, the hydraulic transmission component 2 adopts a hydraulic cylinder 2, and the hydraulic cylinder 2 is connected to the pressure plate by bolts; the telescopic end of the hydraulic cylinder 2 is connected to the fixed rod through a joint.

[0017] As a further improved technical solution of the present invention, the end of the control rod away from the raised clamping head is cross-shaped.

[0018] As a further improved technical solution of the present invention, the inner wall of the through hole is elastically slidably connected to the control rod via a spring, and the spring is sleeved on the outside of the control rod.

[0019] In order to achieve the above technical purpose, another technical solution adopted by the present invention is:

[0020] A laminating method of a CLT wood structure flexible gluing press based on wood yield strength, comprising:

[0021] Step 1: When the protruding clamp head at one end of the control rod faces downward, the protruding clamp head of the control rod is clamped with the end surface of the hemispherical protrusion at the bottom end of the fixed rod, thereby realizing the connection between the fixed rod and the pressing block body;

[0022] Step 2: Place the arranged cross-laminated timber to be pressed on the base of the support frame, and control the hydraulic transmission component 1 in the hydraulic flow distribution system to drive the pressing plate to move downward, and the pressing plate stops moving after moving downward to a preset position;

[0023] Step 3, control the hydraulic transmission component 2 through the controller in the hydraulic flow distribution system to drive the pressing block body to move downward. If the upper surface heights of the orthogonal glued timber to be pressed are different, the hemispherical groove on the pressing block body will rotate along the hemispherical protrusion at the bottom of the fixed rod, and the pressing block body will remain in close contact with and press the orthogonal glued timber. The pressure sensor detects the pressure information of the liquid in the hydraulic transmission component 2 in real time and sends the pressure information to the controller in the hydraulic flow distribution system. The controller in the hydraulic flow distribution system supplies the hydraulic transmission component 2 with appropriate liquid flow according to the pressure information detected by the pressure sensor and the wood yield strength corresponding to the orthogonal glued timber to be pressed in the multi-wood yield strength data set, so as to ensure that the liquid pressure in each hydraulic transmission component 2 is consistent, and then control all the pressing block bodies to apply consistent pressure to the orthogonal glued timber, and at the same time avoid excessive liquid pressure in each hydraulic transmission component 2, which may cause plastic deformation of the orthogonal glued timber. After the preset pressure maintenance time, the hydraulic transmission component 1 and the hydraulic transmission component 2 are reset;

[0024] Step 4: If the pressing block body is damaged, the controller in the hydraulic flow distribution system controls the hydraulic transmission component 1 to drive the pressing plate to lift, and then the controller in the hydraulic flow distribution system controls the hydraulic transmission component 2 corresponding to the damaged pressing block body to drive the damaged pressing block body to move downward, so that the damaged pressing block body is lower than other intact pressing block bodies, and then the damaged pressing block body stops moving;

[0025] Step 5, rotate the control rod in the damaged pressing block body 180 degrees so that the raised clamping head of the control rod faces upward, and under the gravity of the damaged pressing block body, the outer spherical surface of the hemispherical protrusion of the fixing rod squeezes the side with an inclined angle on the raised clamping head of the control rod, and the raised clamping head of the control rod slides toward the through hole, compressing the spring, and the side with an inclined angle on the raised clamping head slides along the outer spherical surface of the hemispherical protrusion. When the spring is compressed to a certain extent, the energy released by it pushes the control rod to squeeze the outer spherical surface of the hemispherical protrusion at the bottom end of the fixing rod, so that the hemispherical protrusion at the bottom end of the fixing rod quickly breaks away from the hemispherical groove and the connecting groove of the damaged pressing block body, and the damaged pressing block body falls off;

[0026] Step 6. Rotate the control rod in the new pressing block body, with the raised head on one end of the control rod facing downward, and then forcefully insert the hemispherical protrusion at the bottom of the fixed rod into the hemispherical groove of the new pressing block body.

[0027] The beneficial effects of the present invention are:

[0028] The present invention can greatly speed up the replacement rate of the damaged pressing block body, reduce the manpower and time cost, further improve the production efficiency of glued wood, and can also avoid the existence of pressure leakage, thereby improving the production quality.

[0029] The controller in the hydraulic flow distribution system of the present invention contains a data set of yield strength of multiple woods: the yield strength of woods of different materials is different. The yield strength of different woods is recorded through experiments and formed into a data set embedded in the controller of the hydraulic flow distribution system. When the current wood is started to be glued, the yield strength of the wood can be directly called in the hydraulic flow distribution system. This prevents the wood from being plastically deformed due to excessive pressure during gluing.

[0030] The present invention designs a hydraulic flow distribution system: because multiple hydraulic cylinders are respectively equipped with pressure sensors, the existence of wood thickness errors will inevitably lead to differences in pressure between hydraulic cylinders. For example, the current wood gluing pressure requires 1Mpa. When the pressure of one or more hydraulic cylinders is less than 1Mpa, the controller in the hydraulic flow distribution system replenishes the flow of the hydraulic cylinder to ensure that the pressure of each hydraulic cylinder is consistent.

[0031] The present invention designs a flexible gluing pressing block: a flexible gluing pressing block with a universal structure can make the pressing surfaces of adjacent wood squares with thickness errors in the orthogonal glued timber to be pressed be stressed at the same time, avoiding pressure leakage. This structure cooperates with the hydraulic flow distribution system to make the board surface stressed evenly.

[0032] When the raised clamping head at one end of the control rod faces downward, the raised clamping head of the control rod is clamped with the end face of the hemispherical protrusion at the bottom end of the fixed rod, thereby realizing the connection between the fixed rod and the pressing block body; the orthogonal glued laminated timber to be pressed is placed on the base of the support frame, and the hydraulic flow distribution system is used to control the hydraulic transmission component 1 to drive the pressing plate to move downward, and the pressing plate stops moving after moving downward to the preset position; the hydraulic flow distribution system is used to control the hydraulic transmission component 2 to drive the pressing block body to move downward, and if the orthogonal glued laminated timber to be pressed is on the upper surface The pressing block body will rotate along the hemispherical convex block at the bottom of the fixed rod, and the pressing block body will keep in close contact and press the upper surfaces of the orthogonal glued timber at different heights to prevent pressure leakage, eliminate bubbles and facilitate the solidification of the glue. At the same time, the pressure sensor detects the hydraulic pressure of the liquid in the hydraulic transmission component 2 in real time and sends the hydraulic information to the hydraulic flow distribution system. The hydraulic flow distribution system supplies the hydraulic transmission component 2 with appropriate liquid flow according to the hydraulic information and the wood yield strength corresponding to the orthogonal glued timber to be pressed in the multi-wood yield strength data set, so as to ensure that the liquid pressure in each hydraulic transmission component 2 is consistent, and then control all the pressing block bodies to apply consistent pressure to the orthogonal glued timber, and avoid excessive liquid pressure in each hydraulic transmission component 2 causing plastic deformation of the orthogonal glued timber; if the pressing block body is damaged, the hydraulic flow distribution system controls the hydraulic transmission component 1 to drive the pressure plate to lift to the appropriate position, and the hydraulic transmission component 2 drives the damaged pressing block body to move downward, so that the damaged pressing block body is lower than other intact pressing block bodies; the control unit in the damaged pressing block body is rotated The control rod is adjusted 180 degrees in total, so that the raised clamp head of the control rod faces upward. Under the gravity of the damaged pressure block, the outer spherical surface of the hemispherical protrusion of the fixed rod squeezes the side with an inclined angle on the raised clamp head of the control rod, compressing the spring, and the side with an inclined angle on the raised clamp head slides along the outer spherical surface of the hemispherical protrusion. When the spring is compressed to a certain extent, the energy released by it pushes the control rod to squeeze the outer spherical surface of the hemispherical protrusion at the bottom of the fixed rod, so that the hemispherical protrusion at the bottom of the fixed rod quickly breaks away from the hemispherical groove and connecting groove of the damaged pressure block body, and the damaged pressure block body falls off; the hydraulic transmission component 2 (i.e., hydraulic cylinder 2) of the present invention is independently equipped with a pressure sensor, and the pressure sensors and hydraulic flow distribution system on multiple hydraulic transmission components 2 together form a set of pressure collection system, which can dynamically adjust the hydraulic cylinder 2 at each position in real time to make the pressure at each point consistent. This set of pressure collection system can ensure that each pressure block body finally reaches a consistent pressure during the downward pressing process.In addition, the present invention has developed a set of multi-wood yield strength data sets for different wood materials to avoid plastic deformation of wood, which can be embedded in the controller in the hydraulic flow distribution system to achieve intelligent and high-quality pressure application.

[0033] The specific structure of the hydraulic flow distribution system of the present invention includes a hydraulic pump, a flow control valve, an oil tank, a controller and other structures. The oil tank is connected to the hydraulic transmission component 1 and the hydraulic transmission component 2 respectively through the hydraulic pump, the flow control valve and the pipeline, the pressure sensor on the hydraulic transmission component 2 is connected to the controller, and the controller is connected to the flow control valve, and then the flow control valve controls the liquid flow to the hydraulic transmission component 1 and the hydraulic transmission component 2, and also provides appropriate flow replenishment for the hydraulic transmission component 2, ensuring that the pressure of each hydraulic cylinder 2 is consistent, and also avoiding excessive pressure to cause plastic deformation of the wood. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a structural diagram of Example 1 of the present invention.

[0035] Figure 2 This is a schematic diagram of the hidden support frame structure of Example 1 of the present invention.

[0036] Figure 3 This is the main structural view of Example 1 of the present invention.

[0037] Figure 4 for Figure 3 The AA section view is the state view of the control lever with the raised clamp head facing downward.

[0038] Figure 5 This is a state diagram of the control rod of Example 1 of the present invention when the protruding clamping head is facing upward.

[0039] Figure 6 It is a side view of the flexible adhesive pressing block according to Example 1 of the present invention.

[0040] Figure 7 This is a cross-sectional view of the flexible glued pressing block in Example 1 of the present invention, in which the pressing block body is pressed against orthogonal glued timber with different upper surface heights.

[0041] Figure 8 This is a diagram of the briquette body falling process of Example 1 of the present invention.

[0042] Fig. 9 This is a structural diagram of Example 2 of the present invention.

[0043] Fig.10 This is a schematic diagram of the connection structure between the pressing block body and the airbag channel steel in Example 2 of the present invention.

[0044] Fig.11This is a cross-sectional view of the pressing block body, the airbag channel steel and the small pressing blocks on the airbag channel steel pressing on the orthogonal glued timber with different upper surface heights according to Example 2 of the present invention. DETAILED DESCRIPTION

[0045] The specific embodiments of the present invention are further described below according to the accompanying drawings:

[0046] Example 1: Figure 1-2 As shown, a CLT wood structure flexible gluing press based on wood yield strength includes a hydraulic flow distribution system for respectively supplying flow to hydraulic transmission component 1 2 and hydraulic transmission component 2 3, hydraulic transmission component 1 2, hydraulic transmission component 2 3, support frame 1, press plate 4 and flexible gluing press block. Support frame 1 is a frame structure with both front and back sides open. Hydraulic transmission component 1 2, hydraulic transmission component 2 3 and flexible gluing press block are all located on the inner side of support frame 1.

[0047] The hydraulic transmission component 2 is arranged on the support frame 1, and the output end of the hydraulic transmission component 2 is connected to the pressure plate 4. Multiple hydraulic transmission components 23 are arranged in a rectangular array on the pressure plate 4. The output end of each hydraulic transmission component 23 is connected to the flexible glued pressure block, and there is a small gap between adjacent flexible glued pressure blocks. A pressure sensor is installed in each hydraulic transmission component 23, and each pressure sensor is connected to the hydraulic flow distribution system.

[0048] like Figure 3-5 As shown, the flexible glued pressing block includes a fixing rod 8, a control rod 7 and a pressing block body 6, wherein the fixing rod 8 is connected to the output end of the hydraulic transmission component 2 3 through a joint 5, the bottom end of the fixing rod 8 is a hemispherical protrusion 801, the pressing block body 6 is provided with a connecting groove 601, the bottom wall of the connecting groove 601 is a hemispherical groove 602, a plurality of through holes 702 are transversely opened in the pressing block body 6, one end of the through hole 702 penetrates the outer surface of the pressing block body 6, and the other end is connected to the connecting groove 601, the control rod 7 is elastically slidably connected inside the through hole 702, and the end of the control rod 7 extending into the connecting groove 601 forms a certain inclination angle so as to form a protruding clamp 701 at this end; the bottom end of the fixing rod 8 extends into the connecting groove 601 of the pressing block body 6 until the hemispherical protrusion 801 is embedded in the hemispherical groove 602, and the hemispherical protrusion 801 can rotate in the hemispherical groove 602;

[0049] When the protruding clamp 701 of the control rod 7 is Figure 4 When facing downward as shown, the protruding clamp head 701 of the control rod 7 is engaged with the end surface of the hemispherical protrusion 801 at the bottom end of the fixing rod 8; Figure 5When facing upward as shown, the pressing block body 6 is acted upon by gravity, and the outer spherical surface of the hemispherical protrusion 801 of the fixing rod 8 squeezes the side with an inclined angle on the protruding clamp 701 of the control rod 7, and the protruding clamp 701 of the control rod 7 slides toward the through hole 702, and the side with an inclined angle on the protruding clamp 701 slides along the outer spherical surface of the hemispherical protrusion 801, until the hemispherical protrusion 801 at the bottom end of the fixing rod 8 is separated from the hemispherical groove 602 of the pressing block body 6, and the pressing block body 6 falls off.

[0050] The controller in the hydraulic flow distribution system contains a data set of yield strengths of multiple woods. The pressure sensor is used to detect the liquid pressure in the hydraulic transmission component 23 and send the liquid pressure to the controller in the hydraulic flow distribution system. The controller in the hydraulic flow distribution system supplies appropriate liquid flow to the hydraulic transmission component 23 based on the liquid pressure detected by the pressure sensor and the yield strengths of multiple woods. Combined with the pressure information fed back by the pressure sensor, the liquid pressure in each hydraulic transmission component 23 is ensured to be consistent, while avoiding excessive liquid pressure in each hydraulic transmission component 23, which may cause plastic deformation of the orthogonal glued timber 10.

[0051] In this embodiment, Figure 2 The pressing plate 4 is a several-shaped structure, including a bottom plate 401 and a top plate 402. The bottom plate 401 is fixedly connected to both sides of the top plate 402. The bottom plate 401 is connected to the output ends of four hydraulic transmission components 1 2, and the top plate 402 is connected to multiple hydraulic transmission components 2 3. The output end of each hydraulic transmission component 2 3 passes through the reserved hole on the top plate 402 and is connected to the fixed rod 8 in the flexible glued pressing block connection.

[0052] In this embodiment, the tops of the plurality of hydraulic transmission components 2 are connected to the support frame 1. The support frame 1 is also provided with a base 101. The base 101 is used to place the orthogonal glued timber 10 to be pressed. The pressing plate 4 is located above the base 101.

[0053] In this embodiment, the hydraulic transmission component 2 adopts a hydraulic cylinder 1, and the top of the hydraulic cylinder 1 is connected to the support frame 1 by bolts; the telescopic end of the hydraulic cylinder 1 is connected to the pressure plate 4 by threads.

[0054] In this embodiment, the hydraulic transmission assembly 2 3 uses a hydraulic cylinder 2, and the hydraulic cylinder 2 is connected to the pressure plate 4 by bolts; the telescopic end of the hydraulic cylinder 2 is connected to the fixed rod 8 by a joint 5. The joint 5 uses an existing joint and can be threadedly connected to the telescopic end and the fixed rod 8.

[0055] In this embodiment, the end of the control rod 7 away from the protruding clamping head 701 is cross-shaped.

[0056] In this embodiment, the inner wall of the through hole 702 is elastically slidably connected to the control rod 7 via a spring 9 , and the spring 9 is sleeved on the outside of the control rod 7 .

[0057] In this embodiment, the flexible glued pressing block has a universal joint mechanism inside, which can realize 360 ​​degrees rotation of the pressing block body 6. 0 The pressing block body 6 is connected by the hemispherical protrusion 801 at the bottom of the control rod 7 and the fixing rod 8. Figure 7 The diameter of the connection groove 601 of the pressing block body 6 is slightly larger than the diameter of the hemispherical groove 602 , so that the pressing block body 6 is ensured to tilt at a certain angle without interfering with the fixing rod 8 .

[0058] When the protruding clamp 701 at one end of the control rod 7 is facing downward, Figure 4 , the raised clamping head 701 of the control rod 7 is clamped with the end face of the hemispherical protrusion 801 at the bottom end of the fixing rod 8, thereby realizing the connection between the fixing rod 8 and the pressing block body 6; the arranged orthogonal glued timber 10 to be pressed (the orthogonal glued timber 10 to be pressed is composed of a plurality of wooden boards coated with glue and arranged up and down in accordance with the horizontal and vertical grains, wherein the wooden board layer is formed by a plurality of wooden squares coated with glue on the side and glued side by side horizontally) is placed on the base 101 of the support frame 1, and the hydraulic flow distribution system is used to control the hydraulic transmission component 1 2 to drive the pressing plate 4 to move downward, and the pressing plate 4 stops moving after moving downward to the preset position; and then the hydraulic flow distribution system is used to control the hydraulic transmission component 2 3 to drive the pressing block body 6 to move downward, so that the pressing block body 6 is pressed against the orthogonal glued timber 10 to be pressed. If the upper surface of the orthogonal glued timber 10 to be pressed is as shown in FIG. Figure 7 As shown in the figure, the pressing block body 6 will rotate along the hemispherical protrusion 801 at the bottom end of the fixing rod 8, and the pressing block body 6 will keep in close contact and press against the orthogonal glued timber 10 to prevent pressure leakage, remove bubbles therein, and facilitate the solidification of the glue. At the same time, the pressure sensor detects the hydraulic pressure of the liquid in the hydraulic transmission component 23 in real time and sends the hydraulic information to the hydraulic flow distribution system. The hydraulic flow distribution system supplies the hydraulic transmission component 23 with appropriate liquid flow according to the hydraulic information and the wood yield strength corresponding to the orthogonal glued timber 10 to be pressed in the multi-wood yield strength data set, so as to ensure that the liquid pressure in each hydraulic transmission component 23 is consistent, and then control all the pressing block bodies 6 to apply consistent pressure to the orthogonal glued timber 10, and at the same time avoid excessive liquid pressure in each hydraulic transmission component 23 causing plastic deformation of the orthogonal glued timber 10. After the preset pressure holding time, the glue between the wood board layers solidifies, and the hydraulic transmission component 12 and the hydraulic transmission component 23 are reset; if the pressing block body 6 is damaged, the hydraulic flow distribution system controls the hydraulic transmission component 12 to drive the pressing plate 4 to be lifted to the appropriate position, and then the hydraulic flow distribution system controls the hydraulic transmission component 23 connected to the damaged pressing block body 6 to drive the damaged pressing block body 6 to move downward, such as Figure 8As shown, the damaged pressing block body 6 is made lower than the other intact pressing block bodies 6, and then the damaged pressing block body 6 stops moving; the control rod 7 in the damaged pressing block body 6 is rotated 180 degrees, that is, Figure 6 As shown, the control rod 7 is rotated from position 1 to position 3, so that the protruding clamping head 701 of the control rod 7 is as shown. Figure 5 As shown, the outer spherical surface of the hemispherical protrusion 801 of the fixing rod 8 squeezes the side with an inclined angle on the protruding clamp 701 of the control rod 7 due to the gravity of the damaged pressing block body 6. The protruding clamp 701 of the control rod 7 slides toward the through hole 702, compressing the spring 9. The side with an inclined angle on the protruding clamp 701 slides along the outer spherical surface of the hemispherical protrusion 801. When the spring 9 is compressed to a certain extent, the energy released by it pushes the control rod 7 to squeeze the fixing rod. The outer spherical surface of the hemispherical protrusion 801 at the bottom of the fixed rod 8 makes the hemispherical protrusion 801 at the bottom of the fixed rod 8 quickly disengage from the hemispherical groove 602 and the connecting groove 601 of the damaged block body 6, and the damaged block body 6 falls off; rotate the control rod 7 in the new block body 6, turn the raised clamping head 701 at one end of the control rod 7 downward, and then forcefully insert the hemispherical protrusion 801 at the bottom of the fixed rod 8 into the hemispherical groove 602 of the new block body 6, thereby realizing the connection between the fixed rod 8 and the block body 6. The hydraulic transmission component 2 3 is independently equipped with a pressure sensor. The pressure sensors and hydraulic flow distribution system on multiple hydraulic transmission components 2 3 together form a set of pressure collection system, which can dynamically adjust the hydraulic cylinder 2 at each position in real time to make the pressure at each point consistent. This set of pressure collection system is independently developed, which can ensure that each block body 6 finally reaches a consistent pressure during the downward pressing process. In addition, for different wood materials, a set of multi-wood yield strength data sets has been developed to avoid plastic deformation of wood, which can be embedded in the controller of the hydraulic flow distribution system to complete intelligent high-quality pressure application. The specific structure of the hydraulic flow distribution system adopts existing technology, including hydraulic pumps, flow control valves, oil tanks and controllers. The oil tank is connected to the hydraulic transmission component 1 2 and the hydraulic transmission component 2 3 through a hydraulic pump, a flow control valve and a pipeline respectively. The pressure sensor on the hydraulic transmission component 2 3 is connected to the controller, and the controller is connected to the flow control valve. Then, the flow control valve controls the liquid flow to the hydraulic transmission component 1 2 and the hydraulic transmission component 2 3, and also provides appropriate flow replenishment for the hydraulic transmission component 2 3 to ensure that the pressure of each hydraulic cylinder 2 is consistent, while also avoiding excessive pressure causing plastic deformation of the wood.

[0059] This embodiment also provides a method for pressing a CLT wood structure flexible gluing press with a wood yield strength, comprising:

[0060] Step 1, when the protruding clamp head 701 at one end of the control rod 7 is facing downward, the protruding clamp head 701 of the control rod 7 is clamped with the end surface of the hemispherical protrusion 801 at the bottom end of the fixing rod 8, thereby connecting the fixing rod 8 with the pressing block body 6;

[0061] Step 2: Place the arranged cross-laminated timber 10 to be pressed on the base 101 of the support frame 1, and control the hydraulic transmission component 1 2 through the controller in the hydraulic flow distribution system to drive the pressing plate 4 to move downward, and the pressing plate 4 stops moving after moving downward to a preset position;

[0062] Step 3, control the hydraulic transmission component 2 3 through the controller in the hydraulic flow distribution system to drive the pressing block body 6 to move downward. If the upper surface heights of the orthogonal glued timber 10 to be pressed are different, the hemispherical groove 602 on the pressing block body 6 will rotate along the hemispherical protrusion 801 at the bottom end of the fixing rod 8, and the pressing block body 6 will keep close contact and press with the orthogonal glued timber 10 to prevent pressure leakage. At the same time, the pressure sensor detects the pressure information of the liquid in the hydraulic transmission component 2 3 in real time and sends the pressure information to the controller in the hydraulic flow distribution system. The controller in the hydraulic flow distribution system supplies the hydraulic transmission component 2 3 with appropriate liquid flow according to the pressure information detected by the pressure sensor and the wood yield strength corresponding to the orthogonal glued timber 10 to be pressed in the multi-wood yield strength data set, so as to ensure that the liquid pressure in each hydraulic transmission component 2 3 is consistent, and then control all the pressing block bodies 6 to apply consistent pressure to the orthogonal glued timber 10, and at the same time avoid excessive liquid pressure in each hydraulic transmission component 2 3, which may cause plastic deformation of the orthogonal glued timber 10. After the preset pressure holding time, the hydraulic transmission component 1 2 and the hydraulic transmission component 2 3 are reset;

[0063] Step 4, if the pressing block body 6 is damaged, the controller in the hydraulic flow distribution system controls the hydraulic transmission component 1 2 to drive the pressing plate 4 to be lifted to a preset position, and then the controller in the hydraulic flow distribution system controls the hydraulic transmission component 2 3 connected to the damaged pressing block body 6 to drive the damaged pressing block body 6 to move downward to a preset position, so that the damaged pressing block body 6 is lower than other intact pressing block bodies 6, and then the damaged pressing block body 6 stops moving;

[0064] Step 5, rotate the control rod 7 in the damaged pressing block body 6 by a total of 180 degrees, so that the protruding clamping head 701 of the control rod 7 faces upward (the side with an inclined angle on the protruding clamping head 701 faces downward), and under the gravity of the damaged pressing block body 6, the outer spherical surface of the hemispherical protrusion 801 of the fixing rod 8 squeezes the side with an inclined angle on the protruding clamping head 701 of the control rod 7, and the protruding clamping head 701 of the control rod 7 slides toward the through hole 702, compressing the spring 9, and the side with an inclined angle on the protruding clamping head 701 slides along the outer spherical surface of the hemispherical protrusion 801. When the spring 9 is compressed to a certain extent, the energy released by it pushes the control rod 7 to squeeze the outer spherical surface of the hemispherical protrusion 801 at the bottom end of the fixing rod 8, so that the hemispherical protrusion 801 at the bottom end of the fixing rod 8 quickly disengages from the hemispherical groove 602 and the connecting groove 601 of the damaged pressing block body 6, and the damaged pressing block body 6 falls off;

[0065] Step 6, rotate the control rod 7 in the new pressing block body 6, with the raised clamping head 701 at one end of the control rod 7 facing downward (the side with an inclined angle on the raised clamping head 701 facing upward), and then forcefully insert the hemispherical protrusion 801 at the bottom end of the fixing rod 8 into the hemispherical groove 602 of the new pressing block body 6.

[0066] Example 2: Figure 9-10 As shown, a CLT wood structure flexible gluing press based on wood yield strength includes a hydraulic flow distribution system for respectively supplying flow to hydraulic transmission component 1 2 and hydraulic transmission component 2 3, hydraulic transmission component 1 2, hydraulic transmission component 2 3, support frame 1 (not shown in the figure, the specific position and structure of support frame 1 are the same as those in embodiment 1), pressing plate 4, flexible gluing pressing block and airbag channel steel 11. Support frame 1 is a frame structure with both front and back sides opened, and hydraulic transmission component 1 2, hydraulic transmission component 2 3, flexible gluing pressing block and airbag channel steel 11 are all located on the inner side of support frame 1.

[0067] The top of the hydraulic transmission component 1 2 is connected to the support frame 1 by bolts, and the output end of the hydraulic transmission component 1 2 is connected to the pressing plate 4. A plurality of hydraulic transmission components 2 3 are arranged in two straight lines on the pressing plate 4. The arrangement position is as follows: Figure 7 As shown, the output end of each hydraulic transmission component 2 3 is connected to the flexible glued pressing block, and there is a small gap between adjacent flexible glued pressing blocks. A pressure sensor is installed in each hydraulic transmission component 2 3, and each pressure sensor is connected to the hydraulic flow distribution system.

[0068] Same reason Figure 3-5As shown, the structure of the flexible glued pressing block in Example 2 is the same as that in Example 1. The structure of the hydraulic flow distribution system in Example 2 is the same as that in Example 1, that is, the controller in the hydraulic flow distribution system contains a multi-wood yield strength data set, and the pressure sensor is used to detect the liquid pressure in each hydraulic transmission component 2 3 and send the liquid pressure to the controller in the hydraulic flow distribution system. The controller in the hydraulic flow distribution system supplies the hydraulic transmission component 2 3 with appropriate liquid flow according to the liquid pressure detected by the pressure sensor and the multi-wood yield strength, and ensures that the liquid pressure in each hydraulic transmission component 2 3 is consistent in combination with the pressure information fed back by the pressure sensor, while avoiding excessive liquid pressure in each hydraulic transmission component 2 3, which causes plastic deformation of the orthogonal glued timber 10. The structure of the pressure plate 4 in Example 2 is the same as that of the pressure plate 4 in Example 1.

[0069] The structure of this embodiment 2 is similar to that of embodiment 1, except that: the number of hydraulic transmission components 2 3 in embodiment 2 is reduced, and at the same time, the same airbag channel steel 11 is connected to the bottom of the front and rear pressing block bodies 6 located in the same direction, and the airbag channel steel 11 includes a channel steel 1101, an airbag 1102 and a small pressing block 1103. The channel steel 1101 is a rectangular parallelepiped structure with an opening at the bottom, and the channel steel 1101 is fixedly connected to the bottom of the pressing block body 6 by welding. An airbag 1102 is placed in the channel steel 1101, and a plurality of small pressing blocks arranged side by side are bonded to the surface of the airbag 1102. The channel steel 1101 is also provided with an inflation port for facilitating the inflation of the airbag 1102. By installing the airbag channel steel 11, embodiment 2 makes the pressure of the plurality of small pressing blocks 1103 pressing on the orthogonal glued timber the same. At the same time, compared with embodiment 1, the number of hydraulic transmission components 2 3 used is reduced, and energy consumption is reduced.

[0070] The airbag is made of rubber. When the airbag 1102 is placed into the channel steel 1101 from the bottom opening of the channel steel 1101, gas is filled into the airbag 1102 through the inflation port. The outer contour size of the airbag after filling with gas is consistent with the inner size of the steel channel. A row of small pressing blocks 1103 are exposed from the bottom opening of the channel steel 1101. A row of small pressing blocks 1103 have a certain elastic force under the action of the airbag. When working, the pressure of each small pressing block 1103 is consistent under the action of the airbag. The pressing block body 6 can be quickly removed and installed, thereby realizing the rapid removal of the airbag steel channel 11 and the rapid replacement of the airbag 1102. The disassembly and installation process of the pressing block body 6 in this embodiment 2 is the same as that in embodiment 1. During operation, when the protruding clamping head 701 at one end of the control rod 7 is facing downward, the protruding clamping head 701 of the control rod 7 is clamped with the end face of the hemispherical protrusion 801 at the bottom end of the fixing rod 8, thereby connecting the fixing rod 8 to the pressing block body 6; the orthogonal glued timber 10 to be pressed is placed on the base 101 of the support frame 1, and the controller in the hydraulic flow distribution system controls the hydraulic transmission component 1 2 to drive the pressing plate 4 to move downward, and the pressing plate 4 stops moving after moving downward to a preset position; the controller in the hydraulic flow distribution system controls each hydraulic transmission component 2 3 to drive the pressing block body 6 to move downward, thereby driving the airbag channel steel 11 to move downward, such as Fig.11As shown, the lower pressing block 1103 at the bottom of the airbag channel steel 11 presses against the orthogonal glued timber 10 to be pressed. If the upper surface heights of the orthogonal glued timber 10 to be pressed are different, the hemispherical groove 602 on the pressing block body 6 will rotate along the hemispherical protrusion 801 at the bottom of the fixing rod 8. The multiple small pressing blocks 1103 are kept in close contact with the surfaces of the orthogonal glued timber 10 at different heights and pressed tightly to prevent pressure leakage. At the same time, the pressure sensor detects the pressure information of the liquid in the hydraulic transmission component 23 in real time and sends the pressure information to the controller in the hydraulic flow distribution system. The controller in the hydraulic flow distribution system detects the pressure information of the liquid in the hydraulic transmission component 23 in real time. The pressure information detected by the force sensor and the wood yield strength corresponding to the cross-laminated timber 10 to be pressed in the multi-wood yield strength data set are then used to supply the hydraulic transmission component 2 3 with appropriate liquid flow, ensuring that the liquid pressure in each hydraulic transmission component 2 3 is consistent, thereby controlling all the pressing block bodies 6 to apply consistent pressure, and the small pressing block 1103 has a certain elastic force under the action of the airbag. When working, the pressure of each small pressing block 1103 is also consistent under the action of the airbag, thereby ensuring that each small pressing block 1103 applies consistent pressure to different surfaces of the cross-laminated timber 10. The hydraulic flow distribution system and the pressure sensor also prevent the excessive liquid pressure in each hydraulic transmission component 2 3 from causing plastic deformation of the cross-laminated timber 10. After the preset pressure is maintained and the glue on the cross-laminated timber 10 is cured, the hydraulic transmission component 1 2 and the hydraulic transmission component 2 3 are reset. If a certain airbag channel steel 11 needs to be replaced, the controller in the hydraulic flow distribution system controls the hydraulic transmission component 1 2 to drive the pressure plate 4 to be lifted to the preset position, and then controls the hydraulic transmission component 2 3 connected to the corresponding airbag channel steel 11 to be replaced to drive the pressure block body 6 and the airbag channel steel 11 to move downward to the preset position, so that the pressure block body 6 and the airbag channel steel 11 to be replaced are lower than other pressure block bodies 6; rotate the control rod 7 in the pressure block body 6 to which the airbag channel steel 11 to be replaced is fixedly connected by a total of 180 degrees, so that the raised clamping head 701 of the control rod 7 faces upward (the side with an inclined angle on the raised clamping head 701 faces downward), and the gravity of the pressure block body 6 The outer spherical surface of the hemispherical protrusion 801 of the fixing rod 8 squeezes the side with an inclined angle on the protruding clamp 701 of the control rod 7, and the protruding clamp 701 of the control rod 7 slides toward the through hole 702, compressing the spring 9, and the side with an inclined angle on the protruding clamp 701 slides along the outer spherical surface of the hemispherical protrusion 801. When the spring 9 is compressed to a certain extent, the energy released by it pushes the control rod 7 to squeeze the outer spherical surface of the hemispherical protrusion 801 at the bottom end of the fixing rod 8, so that the hemispherical protrusion 801 at the bottom end of the fixing rod 8 quickly breaks away from the damaged hemispherical groove 602 and the connecting groove 601 of the pressing block body 6, and the airbag channel steel 11 to be replaced and the pressing block body 6 connected thereto fall off together.Rotate the control rod 7 in the pressing block body 6 connected to the new airbag channel steel 11, and make the protruding clamp head 701 at one end of the control rod 7 face downward (the side with the inclined angle on the protruding clamp head 701 faces upward), and then forcefully insert the hemispherical protrusion 801 at the bottom end of the fixing rod 8 into the hemispherical groove 602 of the pressing block body 6 connected to the new airbag channel steel 11. The replacement is completed.

[0071] The protection scope of the present invention includes but is not limited to the above embodiments. The protection scope of the present invention shall be based on the claims. Any replacement, deformation, and improvement of the technology that can be easily thought of by technicians in this field shall fall within the protection scope of the present invention.

Claims

1. A CLT wood structure flexible gluing press based on wood yield strength, characterized in that: It comprises a hydraulic flow distribution system for replenishing flow for hydraulic transmission component 1 (2) and hydraulic transmission component 2 (3), hydraulic transmission component 1 (2), hydraulic transmission component 2 (3), a support frame (1), a pressure plate (4) and a flexible glued pressure block; The hydraulic transmission component 1 (2) is arranged on the support frame (1), and the output end of the hydraulic transmission component 1 (2) is connected to the pressing plate (4); A plurality of hydraulic transmission components 2 (3) are arranged on a pressure plate (4), and the output end of each hydraulic transmission component 2 (3) is connected to a flexible glued pressure block; a pressure sensor is installed in each hydraulic transmission component 2 (3), and each pressure sensor is connected to a hydraulic flow distribution system; The flexible glued pressure block comprises a fixing rod (8), a control rod (7) and a pressure block body (6); the fixing rod (8) is connected to the output end of the second hydraulic transmission component (3); the bottom end of the fixing rod (8) is a hemispherical protrusion (801); the pressure block body (6) is provided with a connecting groove (601); the bottom wall of the connecting groove (601) is a hemispherical groove (602); a plurality of through holes (702) are transversely opened in the pressure block body (6); one end of the through hole (702) penetrates the pressure block body (6); ) on the outer surface of the pressing block body (6), and the other end is connected to the connecting groove (601); a control rod (7) is elastically slidably connected inside the through hole (702); one end of the control rod (7) extends into the connecting groove (601) at a certain inclination angle so as to form a protruding clamp (701) at the end; the bottom end of the fixing rod (8) extends into the connecting groove (601) of the pressing block body (6) until the hemispherical protrusion (801) is embedded in the hemispherical groove (602); the hemispherical protrusion (801) can rotate in the hemispherical groove (602); When the raised clamping head (701) of the control rod (7) is facing downward, the raised clamping head (701) of the control rod (7) is clamped with the end face of the hemispherical protrusion (801) at the bottom end of the fixed rod (8); when the raised clamping head (701) of the control rod (7) is facing upward, the pressing block body (6) is acted upon by gravity, and the outer spherical surface of the hemispherical protrusion (801) of the fixed rod (8) squeezes the side surface with an inclined angle on the raised clamping head (701) of the control rod (7), and the raised clamping head (701) of the control rod (7) slides toward the through hole (702), and the side surface with an inclined angle on the raised clamping head (701) slides along the outer spherical surface of the hemispherical protrusion (801) until the hemispherical protrusion (801) at the bottom end of the fixed rod (8) is separated from the hemispherical groove (602) of the pressing block body (6), and the pressing block body (6) falls off; The controller in the hydraulic flow distribution system contains a data set of yield strengths of multiple woods. The pressure sensor is used to detect the liquid pressure in the hydraulic transmission component 2 (3) and send the liquid pressure to the controller in the hydraulic flow distribution system. The controller in the hydraulic flow distribution system is used to supply flow to the hydraulic transmission component 2 (3) according to the liquid pressure detected by the pressure sensor and the yield strengths of multiple woods, thereby ensuring that the liquid pressure in each hydraulic transmission component 2 (3) is consistent and preventing the orthogonal glued timber (10) from being plastically deformed due to excessive liquid pressure in each hydraulic transmission component 2 (3).

2. The CLT wood structure flexible gluing press based on wood yield strength according to claim 1, characterized in that: The pressure plate (4) is a multi-shaped structure, comprising a bottom plate (401) and a top plate (402), the bottom plate (401) being fixedly connected to both sides of the top plate (402), the bottom plate (401) being connected to the output ends of a plurality of hydraulic transmission components one (2), the top plate (402) being connected to a plurality of hydraulic transmission components two (3), the output end of each hydraulic transmission component two (3) passing through a reserved hole on the top plate (402) and then connected to a fixed rod (8) in a flexible glued pressure block connection.

3. The CLT wood structure flexible gluing press based on wood yield strength according to claim 1, characterized in that: A plurality of hydraulic transmission components (2) are connected to a support frame (1), and the support frame (1) is further provided with a base (101), wherein the base (101) is used for placing cross-laminated timber (10) to be pressed, and the pressing plate (4) is located above the base (101).

4. The CLT wood structure flexible gluing press based on wood yield strength according to claim 1, characterized in that: The hydraulic transmission component 1 (2) adopts a hydraulic cylinder 1, and the hydraulic cylinder 1 is connected to the support frame (1) by bolts; the telescopic end of the hydraulic cylinder 1 is connected to the pressure plate (4) by threads.

5. The CLT wood structure flexible gluing press based on wood yield strength according to claim 1, characterized in that: The hydraulic transmission component 2 (3) adopts a hydraulic cylinder 2, and the hydraulic cylinder 2 is connected to the pressure plate (4) through bolts; the telescopic end of the hydraulic cylinder 2 is connected to the fixing rod (8) through a joint (5).

6. The CLT wood structure flexible gluing press based on wood yield strength according to claim 1, characterized in that: The end of the control rod (7) away from the protruding clamp (701) is cross-shaped.

7. The CLT wood structure flexible gluing press based on wood yield strength according to claim 1, characterized in that: The inner wall of the through hole (702) is elastically slidably connected to the control rod (7) via a spring (9), and the spring (9) is sleeved on the outside of the control rod (7).

8. A laminating method of a CLT wood structure flexible gluing press based on wood yield strength according to claim 7, characterized in that: include: Step 1: When the protruding clamp (701) at one end of the control rod (7) faces downward, the protruding clamp (701) of the control rod (7) is clamped with the end surface of the hemispherical protrusion (801) at the bottom end of the fixing rod (8), thereby achieving connection between the fixing rod (8) and the pressing block body (6); Step 2: Place the arranged cross-laminated timber (10) to be pressed on the base (101) of the support frame (1), and control the hydraulic transmission component 1 (2) through the controller in the hydraulic flow distribution system to drive the pressing plate (4) to move downward, and the pressing plate (4) stops moving after moving downward to a preset position; Step 3, the controller in the hydraulic flow distribution system controls the hydraulic transmission component 2 (3) to drive the pressing block body (6) to move downward. If the upper surface heights of the orthogonal glued timber (10) to be pressed are different, the hemispherical groove (602) on the pressing block body (6) will rotate along the hemispherical protrusion (801) at the bottom end of the fixing rod (8), and the pressing block body (6) will remain tightly attached to and pressed against the orthogonal glued timber (10). The pressure sensor detects the pressure information of the liquid in the hydraulic transmission component 2 (3) in real time and sends the pressure information to the controller in the hydraulic flow distribution system. The controller in the hydraulic flow distribution system detects the pressure information of the liquid in the hydraulic transmission component 2 (3) in real time. The pressure information detected by the pressure sensor and the wood yield strength corresponding to the cross-laminated timber (10) to be pressed in the multi-wood yield strength data set are then used to supply the hydraulic transmission component 2 (3) with appropriate liquid flow, thereby ensuring that the liquid pressure in each hydraulic transmission component 2 (3) is consistent, thereby controlling all the pressing block bodies (6) to apply consistent pressure to the cross-laminated timber (10), while preventing the liquid pressure in each hydraulic transmission component 2 (3) from being too high, causing the cross-laminated timber (10) to undergo plastic deformation. After maintaining the pressure for a preset time, the hydraulic transmission component 1 (2) and the hydraulic transmission component 2 (3) are reset; Step 4: If the pressing block body (6) is damaged, the controller in the hydraulic flow distribution system controls the hydraulic transmission component 1 (2) to drive the pressing plate (4) to lift up, and then the controller in the hydraulic flow distribution system controls the hydraulic transmission component 2 (3) connected to the damaged pressing block body (6) to drive the damaged pressing block body (6) to move downward, so that the damaged pressing block body (6) is lower than other intact pressing block bodies (6), and then the damaged pressing block body (6) stops moving; Step 5: Rotate the control rod (7) in the damaged pressing block body (6) by 180 degrees so that the protruding clamp (701) of the control rod (7) faces upward. Under the gravity of the damaged pressing block body (6), the outer spherical surface of the hemispherical convex block (801) of the fixing rod (8) presses the side surface with an inclined angle on the protruding clamp (701) of the control rod (7). The protruding clamp (701) of the control rod (7) slides toward the through hole (702), compressing the spring (9). The protruding clamp ( The side surface with an inclined angle on the spring (701) slides along the outer spherical surface of the hemispherical projection (801), and when the spring (9) is compressed to a certain extent, the energy released by the spring (9) pushes the control rod (7) to squeeze the outer spherical surface of the hemispherical projection (801) at the bottom end of the fixing rod (8), so that the hemispherical projection (801) at the bottom end of the fixing rod (8) quickly disengages from the hemispherical groove (602) and the connecting groove (601) of the damaged pressing block body (6), and the damaged pressing block body (6) falls off; Step 6: Rotate the control rod (7) in the new pressing block body (6), with the protruding clamp (701) at one end of the control rod (7) facing downward, and then forcefully insert the hemispherical protrusion (801) at the bottom end of the fixing rod (8) into the hemispherical groove (602) of the new pressing block body (6).

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