Cutter mounting device and cutter mounting equipment

Abstract

A cutter mounting device comprises a connecting plate; the cutter pressing sleeve is arranged on the connecting plate in a penetrating mode, one end of the cutter pressing sleeve is provided with a cutter pressing opening used for being matched with a cutter, and a guide channel communicated with the cutter pressing opening is formed in the cutter pressing sleeve; the knife pressing block is arranged in the guide channel in a sliding manner; the first locking assembly is connected with the end, away from the knife pressing opening, of the knife pressing sleeve. The second locking assembly is erected on the connecting plate and corresponds to the first locking assembly; the adjusting assembly penetrates through the first locking assembly and the second locking assembly in a sliding mode and is connected to the knife pressing block, and the adjusting assembly is in locking fit with the first locking assembly and the second locking assembly. The embodiment of the utility model further provides a cutter installing device which comprises the cutter installing device. The pressure bearing piece is matched with the cutter mounting device; and the moving device is connected with the connecting plate. The cutter mounting device and the cutter mounting equipment can adapt to cutters of different models, and are low in potential safety hazard, low in labor intensity and high in operation efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of knife pressing, in particular to a knife installing device and knife installing equipment. Background Art

[0002] When CNC machining the metal back shell of a mobile phone, on-site personnel are required to perform tool assembly and disassembly operations. The current assembly and disassembly method is that the on-site personnel first place the cleaned tool handle connected to the tool head on the workbench, pre-tighten the tool head (tool handle nut) and then insert the tool into the tool handle's jacket, and then use a height block to press the tool down to a specified height according to the required tool assembly length. However, the current assembly and adjustment operations are all performed manually, which poses a safety hazard during operation, is labor-intensive, and has low operating efficiency. Utility Model Content

[0003] In view of the above situation, it is necessary to provide a knife-loading device and a knife-loading equipment to improve the working efficiency, reduce the labor intensity and reduce the potential safety hazards during the operation.

[0004] The utility model embodiment provides a knife installation device, comprising:

[0005] A connecting plate, used for connecting the moving device for movement;

[0006] A knife pressing sleeve is inserted through the connecting plate, one end of the knife pressing sleeve is provided with a knife pressing opening for adapting a tool, and a guide channel communicating with the knife pressing opening is provided in the knife pressing sleeve;

[0007] A knife pressing block is slidably disposed in the guide channel and is used to abut against the knife;

[0008] A first locking assembly connected to an end of the knife pressing sleeve away from the knife pressing opening;

[0009] A second locking assembly, mounted on the connecting plate and corresponding to the first locking assembly;

[0010] An adjusting component slides through the first locking component and the second locking component and is connected to the knife pressing block. The adjusting component forms a locking fit with the first locking component and the second locking component respectively, and is used to move the connecting plate to make the knife pressing block slide in the guide channel to adjust the distance from the knife pressing block to the knife pressing edge, thereby adapting to different types of knives.

[0011] In some embodiments, the adjustment component includes:

[0012] An adjusting rod passing through the first locking assembly and the second locking assembly, one end of the adjusting rod being connected to the knife pressing block;

[0013] The clamping member is connected to the other end of the adjusting rod and is clamped on a side of the second locking component facing away from the first locking component.

[0014] In some embodiments, a plurality of first locking holes are provided on one side of the adjusting rod passing through the first locking assembly, and the plurality of first locking holes are arranged at intervals along the extending direction of the adjusting rod, and the first locking assembly can extend into different first locking holes to adjust the distance between the knife pressing block and the knife pressing edge;

[0015] A second locking hole is provided on one side of the adjusting rod passing through the second locking component, and the second locking component can extend into the second locking hole to fix the adjusting rod.

[0016] In some embodiments, the adjustment component further comprises:

[0017] A fixing member, fixedly disposed on the adjusting rod and located between the first locking assembly and the second locking assembly;

[0018] The first elastic member is sleeved on the adjusting rod, and two ends of the first elastic member are respectively in contact with the fixing member and the first locking assembly.

[0019] In some embodiments, the adjustment component further comprises:

[0020] The second elastic member is sleeved on the adjusting rod, and two ends of the second elastic member respectively abut against the fixing member and the second locking assembly.

[0021] In some embodiments, the first locking assembly comprises:

[0022] A first bearing member is fixedly connected to the knife pressing sleeve and is located between the connecting plate and the second locking assembly. A first moving hole and a first locking hole communicating with the first moving hole are formed on the first bearing member. The adjusting assembly is passed through the first moving hole.

[0023] A first locking member, slidably disposed in the first locking hole;

[0024] The first locking driving member is disposed on the first bearing member and connected to the first locking member, and is used for driving the first locking member to move closer to or away from the adjusting component, so that the first locking member tightens or loosens the adjusting component.

[0025] In some embodiments, the second locking assembly comprises:

[0026] A second bearing member is mounted on the connecting plate, a second moving hole and a second locking hole communicating with the second moving hole are opened on the second bearing member, and the adjusting component is passed through the second moving hole;

[0027] A second locking member, slidably disposed in the second locking hole;

[0028] The second locking driving member is disposed on the second bearing member and connected to the second locking member, and is used for driving the second locking member to move closer to or away from the adjusting component, so that the second locking member tightens or loosens the adjusting component.

[0029] In some embodiments, the knife-loading device further comprises:

[0030] The clamping assembly comprises a clamping drive and two oppositely arranged claws. The clamping drive is arranged on the connecting plate and connected to the two claws, and is used to drive the two claws to move closer to or away from each other to clamp or release the tool.

[0031] In some embodiments, the knife-loading device further comprises:

[0032] The knife pressing height detector is arranged on the connecting plate and is used for detecting the knife pressing height of the tool after the adjusting assembly presses the knife.

[0033] The utility model also provides a knife-loading device, comprising:

[0034] A knife-loading device as described above;

[0035] A pressure-bearing member adapted to the knife-mounting device; and

[0036] A moving device is connected to the connecting plate and is used to drive the connecting plate to move toward the pressure-bearing member and abut against the pressure-bearing member, so that the pressure knife block slides in the guide channel, thereby adjusting the distance from the pressure knife block to the pressure knife edge.

[0037] The above-mentioned knife-loading device and knife-loading equipment drive the connecting plate to move toward the pressure-bearing part and abut against the pressure-bearing part through the moving device, so that the knife pressing block slides in the guide channel, thereby adjusting the distance from the knife pressing block to the knife pressing edge, and then adapting to different types of knives. It has low safety hazards, low labor intensity and high operating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a three-dimensional structural schematic diagram of a knife mounting device proposed in one embodiment of the utility model.

[0039] Figure 2 yes Figure 1 Schematic diagram of the exploded structure of the tool mounting device shown in .

[0040] Figure 3 yes Figure 2 The schematic diagram of the cross-sectional structure of the tool mounting device along the AA direction is shown in FIG.

[0041] Figure 4 It is a structural schematic diagram of a knife-loading device proposed in one embodiment of the utility model.

[0042] Main component symbols

[0043] Knife loading device 100

[0044] Connecting plate 10

[0045] Press knife set 20

[0046] Pressing edge 21

[0047] Guide channel 22

[0048] Press block 30

[0049] The first locking assembly 40

[0050] First bearing member 41

[0051] First moving hole 411

[0052] First locking hole 412

[0053] The first locking member 42

[0054] First locking drive member 43

[0055] Second locking assembly 50

[0056] The second bearing member 51

[0057] Second moving hole 511

[0058] Second locking hole 512

[0059] The second locking member 52

[0060] Second locking drive member 53

[0061] Round rod 54

[0062] Adjustment assembly 60

[0063] Adjustment rod 61

[0064] First keyhole 611

[0065] Second keyhole 612

[0066] Holder 62

[0067] Fixing 63

[0068] The first elastic member 64

[0069] The second elastic member 65

[0070] Clamping assembly 70

[0071] Clamping drive member 71

[0072] Claw 72

[0073] Press knife height detector 80

[0074] Pressure bearing parts 200

[0075] Mobile device 300

[0076] Tool loading equipment 1000

[0077] Tool 1

[0078] Knife handle 2 DETAILED DESCRIPTION

[0079] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0080] In the description of the present application, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, in the description of the present application, it should be noted that the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0081] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0082] The following is a further description of the embodiments of the present invention with reference to the accompanying drawings.

[0083] See also Figures 1 to 3The embodiment of the utility model proposes a tool installation device 100 for inserting tools 1 of different models into a tool handle 2. The tool installation device 100 includes a connecting plate 10, a tool pressing sleeve 20, a tool pressing block 30, a first locking assembly 40, a second locking assembly 50 and an adjusting assembly 60.

[0084] The connecting plate 10 is used to connect the mobile device 300 (such as Figure 4 The knife pressing sleeve 20 is provided on the connecting plate 10, and one end of the knife pressing sleeve 20 is provided with a knife pressing opening 21 for adapting the tool 1, and a guide channel 22 connected to the knife pressing opening 21 is provided in the knife pressing sleeve 20. The knife pressing block 30 is a columnar structure, and the knife pressing block 30 is slidably provided in the guide channel 22 for abutting the tool 1. The first locking component 40 is connected to the end of the knife pressing sleeve 20 away from the knife pressing opening 21. The second locking component 50 is mounted on the connecting plate 10 and corresponds to the first locking component 40. The adjusting component 60 slidably passes through the first locking component 40 and the second locking component 50 and is connected to the knife pressing block 30. The adjusting component 60 forms a locking fit with the first locking component 40 and the second locking component 50 respectively, and is used to move the connecting plate 10 to make the knife pressing block 30 slide in the guide channel 22 to adjust the distance from the knife pressing block 30 to the knife pressing opening 21, so as to adapt to different models of knives 1.

[0085] In this embodiment, the knife pressing sleeve 20 , the knife pressing block 30 , the first locking assembly 40 , the second locking assembly 50 and the adjusting assembly 60 are each in the form of two and are spaced apart at both ends of the connecting plate 10 .

[0086] The first locking assembly 40 includes a first bearing member 41, a first locking member 42 and a first locking driving member 43. The first bearing member 41 is block-shaped, fixedly connected to the knife press sleeve 20, and located between the connecting plate 10 and the second locking assembly 50. The first bearing member 41 is provided with a first moving hole 411 and a first locking hole 412 connected to the first moving hole 411. The first moving hole 411 is a rectangular hole, and the first locking hole 412 is a circular hole. The axial direction of the first moving hole 411 is perpendicular to the axial direction of the first locking hole 412, wherein the adjustment assembly 60 is penetrated through the first moving hole 411. The first locking member 42 is columnar, and the first locking member 42 is slidably arranged in the first locking hole 412. The first locking driving member 43 is arranged on the first bearing member 41 and connected to the first locking member 42, and is used to drive the first locking member 42 to move close to or away from the adjustment assembly 60, so that the first locking member 42 presses against or releases the adjustment assembly 60. In this embodiment, the first locking driving member 43 is a cylinder. Thus, by providing the first bearing member 41, the first locking member 42 and the first locking driving member 43, the adjusting assembly 60 can be tightened or loosened, and the layout is relatively compact.

[0087] The second locking assembly 50 includes a second bearing member 51, a second locking member 52 and a second locking driving member 53. The second bearing member 51 is a T-shaped block, and the second bearing member 51 is mounted on the connecting plate 10 through two round rods 54 arranged at intervals. The second bearing member 51 is provided with a second moving hole 511 and a second locking hole 512 connected to the second moving hole 511. The second moving hole 511 is a rectangular hole, and the second locking hole 512 is a round hole. The axial direction of the second moving hole 511 is perpendicular to the axial direction of the second locking hole 512, wherein the adjustment assembly 60 is penetrated through the second moving hole 511. The second locking member 52 is a columnar member, and the second locking member 52 is slidably arranged in the second locking hole 512. The second locking driving member 53 is arranged on the second bearing member 51 and connected to the second locking member 52, and is used to drive the second locking member 52 to move close to or away from the adjustment assembly 60, so that the second locking member 52 presses against or releases the adjustment assembly 60. In this embodiment, the second locking driving member 53 is a cylinder. Thus, by providing the second bearing member 51, the second locking member 52 and the second locking driving member 53, the adjusting assembly 60 can be tightened or loosened, and the layout is relatively compact.

[0088] The adjustment assembly 60 includes an adjustment rod 61 and a clamping member 62. The adjustment rod 61 is a square rod, passes through the first locking assembly 40 and the second locking assembly 50, and one end of the adjustment rod 61 is connected to the knife pressing block 30. The clamping member 62 is a columnar member, connected to the other end of the adjustment rod 61, and clamped on the side of the second locking assembly 50 away from the first locking assembly 40. In this way, by providing the clamping member 62, the clamping member 62 can be clamped on the second locking assembly 50 to prevent the adjustment rod 61 from sliding off the second locking assembly 50.

[0089] A plurality of first locking holes 611 are provided on one side of the adjusting rod 61 passing through the first locking assembly 40, and the plurality of first locking holes 611 are arranged at intervals along the extending direction of the adjusting rod 61. The first locking assembly 40 can extend into different first locking holes 611 to adjust the distance between the knife pressing block 30 and the knife pressing edge 21; a second locking hole 612 is provided on one side of the adjusting rod 61 passing through the second locking assembly 50, and the second locking assembly 50 can extend into the second locking hole 612 to fix the adjusting rod 61. In this embodiment, the first locking holes 611 are blind holes and the number is six, and the second locking hole 612 is a blind hole and the number is one. In this way, by providing a plurality of first locking holes 611 and a second locking hole 612, when adjusting the distance between the knife pressing block 30 and the knife pressing edge 21, the second locking assembly 50 extends into the second locking hole 612 to fix the adjusting rod 61, and the first locking assembly 40 is driven to move up and down along the adjusting rod 61 through the connecting plate 10 to correspond to different first locking holes 611.

[0090] The adjustment assembly 60 also includes a fixing member 63 and a first elastic member 64. The fixing member 63 is an annular structure, and the fixing member 63 is fixed on the adjustment rod 61 and is located between the first locking assembly 40 and the second locking assembly 50. The first elastic member 64 is sleeved on the adjustment rod 61, and the two ends of the first elastic member 64 abut the fixing member 63 and the first locking assembly 40 respectively. In this embodiment, the first elastic member 64 is a spring. In this way, when the knife is pressed, the second locking assembly 50 withdraws from the second lock hole 612, so that the adjustment rod 61 moves up and down relatively. By setting the first elastic member 64, the knife pressing reference surface error caused by different specifications of the knife handle 2 and inconsistent loosening of the knife handle nut can be offset.

[0091] The adjustment assembly 60 further includes a second elastic member 65, which is sleeved on the adjustment rod 61, and the two ends of the second elastic member 65 respectively abut against the fixing member 63 and the second locking assembly 50. In this embodiment, the second elastic member 65 is a spring. Thus, by providing the second elastic member 65, it is possible to prevent the fixing member 63 and the second locking assembly 50 from being scratched by hard contact.

[0092] In some embodiments, the tool mounting device 100 further includes a clamping assembly 70, which includes a clamping drive 71 and two oppositely disposed claws 72. The clamping drive 71 is disposed on the connecting plate 10 and connected to the two claws 72, and is used to drive the two claws 72 to move closer to or farther from each other to clamp or release the tool 1. In this embodiment, the clamping drive 71 is a cylinder. There are two clamping assemblies 70 and they are disposed at both ends of the connecting plate 10. In this way, the clamping drive 71 drives the two claws 72 to move closer to each other, so as to clamp the tool 1 and insert the tool 1 into the handle 2.

[0093] In some embodiments, the tool mounting device 100 further includes a tool pressing height detector 80, which is disposed on the connecting plate 10 and is used to detect the tool pressing height of the tool 1 after the adjusting assembly 60 presses the tool. In this embodiment, there are two tool pressing height detectors 80, which are disposed between two clamping assemblies 70. In this way, by providing the tool pressing height detector 80, it is possible to detect whether the tool pressing height of the tool 1 is within the error range, and the detection accuracy is high.

[0094] Please also see Figure 4 The embodiment of the utility model further proposes a tool-mounting device 1000 , including a tool-mounting device 100 , a pressure-bearing member 200 and a moving device 300 .

[0095] The pressure-bearing member 200 is adapted to the knife-mounting device 100. The moving device 300 is connected to the connecting plate 10, and is used to drive the connecting plate 10 to move toward the pressure-bearing member 200 and abut against the pressure-bearing member 200, so that the knife-pressing block 30 slides in the guide channel 22, thereby adjusting the distance from the knife-pressing block 30 to the knife-pressing edge 21. In this embodiment, the pressure-bearing member 200 is a columnar structure, and its diameter is greater than the diameter of the guide channel 22. The moving device 300 is a robotic arm. In this way, the distance from the knife-pressing block 30 to the knife-pressing edge 21 can be adjusted through the knife-mounting device 100, the pressure-bearing member 200 and the moving device 300.

[0096] The implementation process of the above-mentioned tool installation device 1000 is as follows:

[0097] The clamping driving member 71 drives the two claws 72 to approach each other, so that the claws 72 clamp the tool 1 and insert the tool 1 into the tool handle 2;

[0098] The first locking driving member 43 drives the first locking member 42 to move away from the adjusting assembly 60, so that the first locking member 42 releases the adjusting assembly 60, and the second locking driving member 53 drives the second locking member 52 to move close to the adjusting assembly 60, so that the second locking member 52 extends into the second locking hole 612 on the adjusting rod 61, and the moving device 300 drives the connecting plate 10 to move toward the pressure-bearing member 200 and abuts against the pressure-bearing member 200, so that the pressure knife block 30 slides in the guide channel 22, thereby adjusting the distance between the pressure knife block 30 and the pressure knife edge 21, and when the preset distance is reached, the first locking driving member 43 drives the first locking member 42 to move close to the adjusting assembly 60, so that the first locking member 42 extends into the corresponding first locking hole 611 on the adjusting rod 61;

[0099] The second locking driving member 53 drives the second locking member 52 to move away from the adjusting assembly 60, so that the second locking member 52 exits the second locking hole 612, and the moving device 300 drives the connecting plate 10 to move toward the knife handle 2, so that the knife 1 extends into the guide channel 22 and abuts against the knife pressing block 30, so that the knife pressing block 30 elastically presses the knife 1 to a desired position under the action of the first elastic member 64 and the second elastic member 65 to complete the knife pressing;

[0100] After the knife is pressed, the knife pressing height detector 80 detects whether the knife pressing height of the tool 1 is within the error range.

[0101] The above-mentioned tool installation device 100 and tool installation equipment 1000 drive the connecting plate 10 to move toward the pressure-bearing part 200 and abut against the pressure-bearing part 200 through the moving device 300, so that the tool pressing block 30 slides in the guide channel 22, thereby adjusting the distance between the tool pressing block 30 and the tool pressing edge 21, and then adapting to different types of tools 1, with low safety hazards, low labor intensity and high operating efficiency.

[0102] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

[0103] Finally, it should be noted that the above implementation modes are only used to illustrate the technical solution of the present application and are not intended to limit it. Although the present application has been described in detail with reference to the preferred implementation modes, a person of ordinary skill in the art should understand that the technical solution of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present application.

Claims

1. A tool loading device, characterized in that: include: A connecting plate, used for connecting the moving device for movement; A knife pressing sleeve is inserted through the connecting plate, one end of the knife pressing sleeve is provided with a knife pressing opening for adapting a tool, and a guide channel communicating with the knife pressing opening is provided in the knife pressing sleeve; A knife pressing block is slidably disposed in the guide channel and is used to abut against the knife; A first locking assembly connected to an end of the knife pressing sleeve away from the knife pressing opening; A second locking assembly, mounted on the connecting plate and corresponding to the first locking assembly; An adjusting component slides through the first locking component and the second locking component and is connected to the knife pressing block. The adjusting component forms a locking fit with the first locking component and the second locking component respectively, and is used to move the connecting plate to make the knife pressing block slide in the guide channel to adjust the distance from the knife pressing block to the knife pressing edge, thereby adapting to different types of knives.

2. The tool mounting device according to claim 1, characterized in that: The adjustment component comprises: An adjusting rod passing through the first locking assembly and the second locking assembly, one end of the adjusting rod being connected to the knife pressing block; The clamping member is connected to the other end of the adjusting rod and is clamped on a side of the second locking component facing away from the first locking component.

3. The tool mounting device according to claim 2, characterized in that: A plurality of first locking holes are provided on one side of the adjusting rod passing through the first locking assembly, and the plurality of first locking holes are arranged at intervals along the extending direction of the adjusting rod, and the first locking assembly can extend into different first locking holes to adjust the distance between the knife pressing block and the knife pressing edge; A second locking hole is provided on one side of the adjusting rod passing through the second locking component, and the second locking component can extend into the second locking hole to fix the adjusting rod.

4. The tool mounting device according to claim 3, characterized in that: The adjustment component also includes: A fixing member, fixedly disposed on the adjusting rod and located between the first locking assembly and the second locking assembly; The first elastic member is sleeved on the adjusting rod, and two ends of the first elastic member are respectively abutted against the fixing member and the first locking assembly.

5. The tool mounting device according to claim 4, characterized in that: The adjustment component also includes: The second elastic member is sleeved on the adjusting rod, and two ends of the second elastic member respectively abut against the fixing member and the second locking assembly.

6. The tool mounting device according to claim 1, characterized in that: The first locking assembly comprises: A first bearing member is fixedly connected to the knife pressing sleeve and is located between the connecting plate and the second locking assembly. A first moving hole and a first locking hole communicating with the first moving hole are formed on the first bearing member. The adjusting assembly is passed through the first moving hole. A first locking member, slidably disposed in the first locking hole; The first locking driving member is disposed on the first bearing member and connected to the first locking member, and is used for driving the first locking member to move closer to or away from the adjusting component, so that the first locking member tightens or loosens the adjusting component.

7. The tool mounting device according to claim 1, characterized in that: The second locking assembly comprises: A second bearing member is mounted on the connecting plate, a second moving hole and a second locking hole communicating with the second moving hole are opened on the second bearing member, and the adjusting component is passed through the second moving hole; A second locking member, slidably disposed in the second locking hole; The second locking driving member is disposed on the second bearing member and connected to the second locking member, and is used for driving the second locking member to move closer to or away from the adjusting component, so that the second locking member tightens or loosens the adjusting component.

8. The tool mounting device according to claim 1, characterized in that: The knife-loading device also includes: The clamping assembly comprises a clamping drive and two oppositely arranged claws. The clamping drive is arranged on the connecting plate and connected to the two claws, and is used to drive the two claws to move closer to or away from each other to clamp or release the tool.

9. The tool mounting device according to claim 1, characterized in that: The knife-loading device also includes: The knife pressing height detector is arranged on the connecting plate and is used for detecting the knife pressing height of the tool after the adjusting assembly presses the knife.

10. A tool loading device, characterized in that: include: The knife loading device according to any one of claims 1 to 9; A pressure-bearing member adapted to the knife-mounting device; and A moving device is connected to the connecting plate and is used to drive the connecting plate to move toward the pressure-bearing member and abut against the pressure-bearing member, so that the pressure knife block slides in the guide channel, thereby adjusting the distance from the pressure knife block to the pressure knife edge.

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